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diff: fix access past end of array

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This commit is contained in:
Denis Vlasenko 2007-02-11 19:07:03 +00:00
parent 6ca0444420
commit 6089c2c31e
1 changed files with 13 additions and 36 deletions
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49
coreutils/diff.c
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@ -1044,15 +1044,10 @@ static int add_to_dirlist(const char *filename,
struct stat ATTRIBUTE_UNUSED * sb, void *userdata,
int depth ATTRIBUTE_UNUSED)
{
/* +2: with space for eventual trailing NULL */
dl = xrealloc(dl, (dl_count+2) * sizeof(dl[0]));
dl[dl_count] = xstrdup(filename + (int)userdata);
dl_count++;
dl = xrealloc(dl, dl_count * sizeof(char *));
dl[dl_count - 1] = xstrdup(filename);
if (option_mask32 & FLAG_r) {
int *pp = (int *) userdata;
int path_len = *pp + 1;
dl[dl_count - 1] = &(dl[dl_count - 1])[path_len];
}
return TRUE;
}
@ -1060,27 +1055,19 @@ static int add_to_dirlist(const char *filename,
/* This returns a sorted directory listing. */
static char **get_dir(char *path)
{
int i;
char **retval;
dl_count = 0;
dl = NULL;
/* If -r has been set, then the recursive_action function will be
* used. Unfortunately, this outputs the root directory along with
* the recursed paths, so use void *userdata to specify the string
* length of the root directory. It can then be removed in
* add_to_dirlist. */
* length of the root directory - '(void*)(strlen(path)+)'.
* add_to_dirlist then removes root dir prefix. */
int path_len = strlen(path);
void *userdata = &path_len;
/* Reset dl_count - there's no need to free dl as xrealloc does
* the job nicely. */
dl_count = 0;
/* Now fill dl with a listing. */
if (option_mask32 & FLAG_r)
if (option_mask32 & FLAG_r) {
recursive_action(path, TRUE, TRUE, FALSE, add_to_dirlist, NULL,
userdata, 0);
else {
(void*)(strlen(path)+1), 0);
} else {
DIR *dp;
struct dirent *ep;
@ -1088,7 +1075,7 @@ static char **get_dir(char *path)
while ((ep = readdir(dp))) {
if (!strcmp(ep->d_name, "..") || LONE_CHAR(ep->d_name, '.'))
continue;
add_to_dirlist(ep->d_name, NULL, NULL, 0);
add_to_dirlist(ep->d_name, NULL, (void*)(int)0, 0);
}
closedir(dp);
}
@ -1096,12 +1083,8 @@ static char **get_dir(char *path)
/* Sort dl alphabetically. */
qsort(dl, dl_count, sizeof(char *), dir_strcmp);
/* Copy dl so that we can return it. */
retval = xmalloc(dl_count * sizeof(char *));
for (i = 0; i < dl_count; i++)
retval[i] = xstrdup(dl[i]);
return retval;
dl[dl_count] = NULL;
return dl;
}
@ -1109,11 +1092,9 @@ static void diffdir(char *p1, char *p2)
{
char **dirlist1, **dirlist2;
char *dp1, *dp2;
int dirlist1_count, dirlist2_count;
int pos;
/* Check for trailing slashes. */
dp1 = last_char_is(p1, '/');
if (dp1 != NULL)
*dp1 = '\0';
@ -1124,11 +1105,7 @@ static void diffdir(char *p1, char *p2)
/* Get directory listings for p1 and p2. */
dirlist1 = get_dir(p1);
dirlist1_count = dl_count;
dirlist1[dirlist1_count] = NULL;
dirlist2 = get_dir(p2);
dirlist2_count = dl_count;
dirlist2[dirlist2_count] = NULL;
/* If -S was set, find the starting point. */
if (start) {