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authorDenis Vlasenko <vda.linux@googlemail.com>2007-02-11 19:07:03 +0000
committerDenis Vlasenko <vda.linux@googlemail.com>2007-02-11 19:07:03 +0000
commit6089c2c31e1e9bfaa5b5432758ff3b19128c2ca8 (patch)
treea3168062055f706daaf229b8beb24520788b9ee5 /coreutils
parent6ca0444420223c224162674902d4f6e4e093962d (diff)
downloadbusybox-6089c2c31e1e9bfaa5b5432758ff3b19128c2ca8.tar.gz
diff: fix access past end of array
Diffstat (limited to 'coreutils')
-rw-r--r--coreutils/diff.c49
1 files changed, 13 insertions, 36 deletions
diff --git a/coreutils/diff.c b/coreutils/diff.c
index 31c20f052..df43c98ad 100644
--- a/coreutils/diff.c
+++ b/coreutils/diff.c
@@ -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. */
-
- int path_len = strlen(path);
- void *userdata = &path_len;
+ * length of the root directory - '(void*)(strlen(path)+)'.
+ * add_to_dirlist then removes root dir prefix. */
- /* 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) {