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hush: add more complex case to leak testcase, fix found breakage
function old new delta unset_local_var_len - 167 +167 run_list 2350 2457 +107 set_vars_and_save_old - 87 +87 free_pipe 207 227 +20 builtin_unset 220 229 +9 builtin_exit 49 47 -2 free_strings_and_unset 53 - -53 set_vars_all_and_save_old 87 - -87 unset_local_var 168 - -168 ------------------------------------------------------------------------------ (add/remove: 2/3 grow/shrink: 3/1 up/down: 390/-310) Total: 80 bytes Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
This commit is contained in:
Denys Vlasenko
parent
cb6ff25afe
commit
acdc49c073
76
shell/hush.c
76
shell/hush.c
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@ -904,30 +904,20 @@ static char **xx_add_string_to_strings(int lineno, char **strings, char *add)
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xx_add_string_to_strings(__LINE__, strings, add)
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#endif
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static int unset_local_var(const char *name);
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static void free_strings_and_unset(char **strings, int unset)
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static void free_strings(char **strings)
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{
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char **v;
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if (!strings)
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return;
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v = strings;
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while (*v) {
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if (unset) {
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unset_local_var(*v);
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}
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free(*v++);
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free(*v);
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v++;
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}
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free(strings);
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}
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static void free_strings(char **strings)
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{
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free_strings_and_unset(strings, 0);
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}
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/* Helpers for setting new $n and restoring them back
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*/
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@ -1340,25 +1330,21 @@ static int set_local_var(char *str, int flg_export, int flg_read_only)
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return 0;
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}
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static int unset_local_var(const char *name)
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static int unset_local_var_len(const char *name, int name_len)
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{
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struct variable *cur;
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struct variable *prev = prev; /* for gcc */
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int name_len;
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struct variable **var_pp;
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if (!name)
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return EXIT_SUCCESS;
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name_len = strlen(name);
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cur = G.top_var;
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while (cur) {
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var_pp = &G.top_var;
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while ((cur = *var_pp) != NULL) {
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if (strncmp(cur->varstr, name, name_len) == 0 && cur->varstr[name_len] == '=') {
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if (cur->flg_read_only) {
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bb_error_msg("%s: readonly variable", name);
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return EXIT_FAILURE;
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}
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/* prev is ok to use here because 1st variable, HUSH_VERSION,
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* is ro, and we cannot reach this code on the 1st pass */
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prev->next = cur->next;
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*var_pp = cur->next;
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debug_printf_env("%s: unsetenv '%s'\n", __func__, cur->varstr);
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bb_unsetenv(cur->varstr);
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if (name_len == 3 && cur->varstr[0] == 'P' && cur->varstr[1] == 'S')
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@ -1368,12 +1354,31 @@ static int unset_local_var(const char *name)
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free(cur);
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return EXIT_SUCCESS;
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}
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prev = cur;
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cur = cur->next;
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var_pp = &cur->next;
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}
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return EXIT_SUCCESS;
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}
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static int unset_local_var(const char *name)
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{
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return unset_local_var_len(name, strlen(name));
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}
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static void unset_vars(char **strings)
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{
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char **v;
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if (!strings)
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return;
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v = strings;
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while (*v) {
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const char *eq = strchrnul(*v, '=');
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unset_local_var_len(*v, (int)(eq - *v));
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v++;
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}
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free(strings);
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}
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#if ENABLE_SH_MATH_SUPPORT
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#define is_name(c) ((c) == '_' || isalpha((unsigned char)(c)))
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#define is_in_name(c) ((c) == '_' || isalnum((unsigned char)(c)))
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@ -1411,13 +1416,17 @@ static void add_vars(struct variable *var)
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next = var->next;
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var->next = G.top_var;
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G.top_var = var;
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if (var->flg_export)
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if (var->flg_export) {
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debug_printf_env("%s: restoring exported '%s'\n", __func__, var->varstr);
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putenv(var->varstr);
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} else {
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debug_printf_env("%s: restoring local '%s'\n", __func__, var->varstr);
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}
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var = next;
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}
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}
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static struct variable *set_vars_all_and_save_old(char **strings)
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static struct variable *set_vars_and_save_old(char **strings)
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{
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char **s;
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struct variable *old = NULL;
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@ -1438,6 +1447,7 @@ static struct variable *set_vars_all_and_save_old(char **strings)
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if (var_pp) {
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/* Remove variable from global linked list */
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var_p = *var_pp;
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debug_printf_env("%s: removing '%s'\n", __func__, var_p->varstr);
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*var_pp = var_p->next;
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/* Add it to returned list */
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var_p->next = old;
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@ -3021,13 +3031,13 @@ static void pseudo_exec_argv(nommu_save_t *nommu_save,
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new_env = expand_assignments(argv, assignment_cnt);
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#if BB_MMU
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set_vars_all_and_save_old(new_env);
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set_vars_and_save_old(new_env);
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free(new_env); /* optional */
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/* we can also destroy set_vars_all_and_save_old's return value,
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/* we can also destroy set_vars_and_save_old's return value,
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* to save memory */
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#else
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nommu_save->new_env = new_env;
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nommu_save->old_vars = set_vars_all_and_save_old(new_env);
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nommu_save->old_vars = set_vars_and_save_old(new_env);
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#endif
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if (argv_expanded) {
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argv = argv_expanded;
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@ -3554,7 +3564,7 @@ static int run_pipe(struct pipe *pi)
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rcode = setup_redirects(command, squirrel);
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if (rcode == 0) {
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new_env = expand_assignments(argv, command->assignment_cnt);
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old_vars = set_vars_all_and_save_old(new_env);
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old_vars = set_vars_and_save_old(new_env);
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if (!funcp) {
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debug_printf_exec(": builtin '%s' '%s'...\n",
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x->cmd, argv_expanded[1]);
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@ -3573,7 +3583,7 @@ static int run_pipe(struct pipe *pi)
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clean_up_and_ret:
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#endif
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restore_redirects(squirrel);
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free_strings_and_unset(new_env, 1);
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unset_vars(new_env);
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add_vars(old_vars);
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clean_up_and_ret1:
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free(argv_expanded);
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@ -3589,7 +3599,7 @@ static int run_pipe(struct pipe *pi)
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rcode = setup_redirects(command, squirrel);
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if (rcode == 0) {
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new_env = expand_assignments(argv, command->assignment_cnt);
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old_vars = set_vars_all_and_save_old(new_env);
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old_vars = set_vars_and_save_old(new_env);
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debug_printf_exec(": run_nofork_applet '%s' '%s'...\n",
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argv_expanded[0], argv_expanded[1]);
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rcode = run_nofork_applet(i, argv_expanded);
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@ -3687,7 +3697,7 @@ static int run_pipe(struct pipe *pi)
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/* Clean up after vforked child */
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free(nommu_save.argv);
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free(nommu_save.argv_from_re_execing);
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free_strings_and_unset(nommu_save.new_env, 1);
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unset_vars(nommu_save.new_env);
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add_vars(nommu_save.old_vars);
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#endif
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free(argv_expanded);
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@ -64,7 +64,7 @@ HERE
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trap "echo trap$i" WINCH
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f() { true; true; true; true; true; true; true; true; }
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f() { true; true; true; true; true; true; true; true; echo $1; }
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f >/dev/null
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i=iii$i t=ttt$i z=zzz$i f >/dev/null
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: $((i++))
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done
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unset i l t
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@ -132,7 +132,7 @@ HERE
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trap "echo trap$i" WINCH
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f() { true; true; true; true; true; true; true; true; }
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f() { true; true; true; true; true; true; true; true; echo $1; }
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f >/dev/null
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i=iii$i t=ttt$i z=zzz$i f >/dev/null
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: $((i++))
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done
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unset i l t
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@ -141,9 +141,8 @@ unset -f f
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memleak
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kb=$?
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# Observed some variability, bumped to 12k
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if test $kb -le 12; then
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if test $kb -le 4; then
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echo Ok #$kb
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else
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echo "Bad: $kb kb (or more) leaked"
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echo "Bad: $kb kb leaked"
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fi
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