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authorRené Scharfe <rene.scharfe@lsrfire.ath.cx>2009-01-31 15:39:10 +0100
committerJunio C Hamano <gitster@pobox.com>2009-01-31 10:39:55 -0800
commitc7cddc1a2f365e4f4aea71b700c0b833eb436fee (patch)
treebef2c12a4203ddd03aa27def6bc1fe8fefc8e451 /unpack-trees.c
parent915308b187bdaba9ad1c6c3dea7b2b4b200b4796 (diff)
downloadgit-c7cddc1a2f365e4f4aea71b700c0b833eb436fee.tar.gz
merge: fix out-of-bounds memory access
The parameter n of unpack_callback() can have a value of up to MAX_UNPACK_TREES. The check at the top of unpack_trees() (its only (indirect) caller) makes sure it cannot exceed this limit. unpack_callback() passes it and the array src to unpack_nondirectories(), which has this loop: for (i = 0; i < n; i++) { /* ... */ src[i + o->merge] = o->df_conflict_entry; o->merge can be 0 or 1, so unpack_nondirectories() potentially accesses the array src at index MAX_UNPACK_TREES. This patch makes it big enough. Reported-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: René Scharfe <rene.scharfe@lsrfire.ath.cx> Signed-off-by: Junio C Hamano <gitster@pobox.com>
Diffstat (limited to 'unpack-trees.c')
-rw-r--r--unpack-trees.c9
1 files changed, 6 insertions, 3 deletions
diff --git a/unpack-trees.c b/unpack-trees.c
index 54f301da67..4229eec123 100644
--- a/unpack-trees.c
+++ b/unpack-trees.c
@@ -240,8 +240,11 @@ static struct cache_entry *create_ce_entry(const struct traverse_info *info, con
return ce;
}
-static int unpack_nondirectories(int n, unsigned long mask, unsigned long dirmask, struct cache_entry *src[5],
- const struct name_entry *names, const struct traverse_info *info)
+static int unpack_nondirectories(int n, unsigned long mask,
+ unsigned long dirmask,
+ struct cache_entry **src,
+ const struct name_entry *names,
+ const struct traverse_info *info)
{
int i;
struct unpack_trees_options *o = info->data;
@@ -291,7 +294,7 @@ static int unpack_nondirectories(int n, unsigned long mask, unsigned long dirmas
static int unpack_callback(int n, unsigned long mask, unsigned long dirmask, struct name_entry *names, struct traverse_info *info)
{
- struct cache_entry *src[5] = { NULL, };
+ struct cache_entry *src[MAX_UNPACK_TREES + 1] = { NULL, };
struct unpack_trees_options *o = info->data;
const struct name_entry *p = names;