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fetch-pack: check for valid commit from server

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A malicious server can return ACK with non-existent SHA-1 or not a
commit. lookup_commit() in this case may return NULL. Do not let
fetch-pack crash by accessing NULL address in this case.

Signed-off-by: Nguyễn Thái Ngọc Duy <pclouds@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Nguyễn Thái Ngọc Duy 2011-08-18 20:36:03 +07:00 committed by Junio C Hamano
parent a47a645e70
commit ec099546a9
1 changed files with 2 additions and 0 deletions
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2
builtin/fetch-pack.c
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@ -395,6 +395,8 @@ static int find_common(int fd[2], unsigned char *result_sha1,
case ACK_continue: {
struct commit *commit =
lookup_commit(result_sha1);
if (!commit)
die("invalid commit %s", sha1_to_hex(result_sha1));
if (args.stateless_rpc
&& ack == ACK_common
&& !(commit->object.flags & COMMON)) {