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hush: fix a memory leak in NOMMU case

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This commit is contained in:
Denis Vlasenko 2008-06-10 16:19:39 +00:00
parent 3fe4f986a0
commit 76d50418b3
1 changed files with 46 additions and 12 deletions
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58
shell/hush.c
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@ -516,8 +516,12 @@ static int free_pipe(struct pipe *pi, int indent);
/* really run the final data structures: */
static int setup_redirects(struct child_prog *prog, int squirrel[]);
static int run_list(struct pipe *pi);
static void pseudo_exec_argv(char **argv) ATTRIBUTE_NORETURN;
static void pseudo_exec(struct child_prog *child) ATTRIBUTE_NORETURN;
#if BB_MMU
#define pseudo_exec_argv(ptrs2free, argv) pseudo_exec_argv(argv)
#define pseudo_exec(ptrs2free, child) pseudo_exec(child)
#endif
static void pseudo_exec_argv(char **ptrs2free, char **argv) ATTRIBUTE_NORETURN;
static void pseudo_exec(char **ptrs2free, struct child_prog *child) ATTRIBUTE_NORETURN;
static int run_pipe(struct pipe *pi);
/* extended glob support: */
static char **globhack(const char *src, char **strings);
@ -619,6 +623,18 @@ static void free_strings(char **strings)
}
#if !BB_MMU
#define EXTRA_PTRS 5 /* 1 for NULL, 1 for args, 3 for paranoid reasons */
static char **alloc_ptrs(char **argv)
{
char **v = argv;
while (*v)
v++;
return xzalloc((v - argv + EXTRA_PTRS) * sizeof(v[0]));
}
#endif
/* Function prototypes for builtins */
static int builtin_cd(char **argv);
static int builtin_echo(char **argv);
@ -891,9 +907,14 @@ static int builtin_exec(char **argv)
{
if (argv[1] == NULL)
return EXIT_SUCCESS; /* bash does this */
{
#if !BB_MMU
char **ptrs2free = alloc_ptrs(argv);
#endif
// FIXME: if exec fails, bash does NOT exit! We do...
pseudo_exec_argv(argv + 1);
/* never returns */
pseudo_exec_argv(ptrs2free, argv + 1);
/* never returns */
}
}
/* built-in 'exit' handler */
@ -1421,7 +1442,7 @@ static void restore_redirects(int squirrel[])
* XXX no exit() here. If you don't exec, use _exit instead.
* The at_exit handlers apparently confuse the calling process,
* in particular stdin handling. Not sure why? -- because of vfork! (vda) */
static void pseudo_exec_argv(char **argv)
static void pseudo_exec_argv(char **ptrs2free, char **argv)
{
int i, rcode;
char *p;
@ -1430,8 +1451,10 @@ static void pseudo_exec_argv(char **argv)
for (i = 0; is_assignment(argv[i]); i++) {
debug_printf_exec("pid %d environment modification: %s\n",
getpid(), argv[i]);
// FIXME: vfork case??
p = expand_string_to_string(argv[i]);
#if !BB_MMU
*ptrs2free++ = p;
#endif
putenv(p);
}
argv += i;
@ -1442,6 +1465,9 @@ static void pseudo_exec_argv(char **argv)
_exit(EXIT_SUCCESS);
argv = expand_strvec_to_strvec(argv);
#if !BB_MMU
*ptrs2free++ = (char*) argv;
#endif
/*
* Check if the command matches any of the builtins.
@ -1485,13 +1511,13 @@ static void pseudo_exec_argv(char **argv)
/* Called after [v]fork() in run_pipe()
*/
static void pseudo_exec(struct child_prog *child)
static void pseudo_exec(char **ptrs2free, struct child_prog *child)
{
// FIXME: buggy wrt NOMMU! Must not modify any global data
// until it does exec/_exit, but currently it does
// (puts malloc'ed stuff into environment)
if (child->argv)
pseudo_exec_argv(child->argv);
pseudo_exec_argv(ptrs2free, child->argv);
if (child->group) {
#if !BB_MMU
@ -1880,10 +1906,16 @@ static int run_pipe(struct pipe *pi)
nextin = 0;
for (i = 0; i < pi->num_progs; i++) {
#if !BB_MMU
char **ptrs2free = NULL;
#endif
child = &(pi->progs[i]);
if (child->argv)
if (child->argv) {
debug_printf_exec(": pipe member '%s' '%s'...\n", child->argv[0], child->argv[1]);
else
#if !BB_MMU
ptrs2free = alloc_ptrs(child->argv);
#endif
} else
debug_printf_exec(": pipe member with no argv\n");
/* pipes are inserted between pairs of commands */
@ -1925,9 +1957,11 @@ static int run_pipe(struct pipe *pi)
set_jobctrl_sighandler(SIG_DFL);
set_misc_sighandler(SIG_DFL);
signal(SIGCHLD, SIG_DFL);
pseudo_exec(child); /* does not return */
pseudo_exec(ptrs2free, child); /* does not return */
}
#if !BB_MMU
free_strings(ptrs2free);
#endif
if (child->pid < 0) { /* [v]fork failed */
/* Clearly indicate, was it fork or vfork */
bb_perror_msg(BB_MMU ? "fork" : "vfork");