connect.c: check the commit buffer boundary while parsing.
Signed-off-by: Junio C Hamano <junkio@cox.net>
diff --git a/commit.c b/commit.c
index 0327df1..e51ffa1 100644
--- a/commit.c
+++ b/commit.c
@@ -236,6 +236,7 @@
int parse_commit_buffer(struct commit *item, void *buffer, unsigned long size)
{
+ char *tail = buffer;
char *bufptr = buffer;
unsigned char parent[20];
struct commit_list **pptr;
@@ -245,9 +246,10 @@
if (item->object.parsed)
return 0;
item->object.parsed = 1;
- if (memcmp(bufptr, "tree ", 5))
+ tail += size;
+ if (tail <= bufptr + 5 || memcmp(bufptr, "tree ", 5))
return error("bogus commit object %s", sha1_to_hex(item->object.sha1));
- if (get_sha1_hex(bufptr + 5, parent) < 0)
+ if (tail <= bufptr + 45 || get_sha1_hex(bufptr + 5, parent) < 0)
return error("bad tree pointer in commit %s",
sha1_to_hex(item->object.sha1));
item->tree = lookup_tree(parent);
@@ -257,10 +259,12 @@
pptr = &item->parents;
graft = lookup_commit_graft(item->object.sha1);
- while (!memcmp(bufptr, "parent ", 7)) {
+ while (bufptr + 48 < tail && !memcmp(bufptr, "parent ", 7)) {
struct commit *new_parent;
- if (get_sha1_hex(bufptr + 7, parent) || bufptr[47] != '\n')
+ if (tail <= bufptr + 48 ||
+ get_sha1_hex(bufptr + 7, parent) ||
+ bufptr[47] != '\n')
return error("bad parents in commit %s", sha1_to_hex(item->object.sha1));
bufptr += 48;
if (graft)
