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check_packed_git_idx(): check integrity of the idx file itself.

Browse source 
Although pack-check.c had routine to verify the checksum for the
pack index file itself, the core did not check it before using
it.

This is stolen from the patch to tighten packname requirements.

Signed-off-by: Junio C Hamano <junkio@cox.net>
(cherry picked from 797bd6f490 commit)
This commit is contained in:
Junio C Hamano 2005-12-22 22:57:20 -08:00
parent 1e80e04492
commit c5ced64578
2 changed files with 22 additions and 1 deletions
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16
sha1_file.c
View file

@ -321,12 +321,16 @@ struct packed_git *packed_git;
static int check_packed_git_idx(const char *path, unsigned long *idx_size_,
void **idx_map_)
{
SHA_CTX ctx;
unsigned char sha1[20];
void *idx_map;
unsigned int *index;
unsigned long idx_size;
int nr, i;
int fd = open(path, O_RDONLY);
int fd;
struct stat st;
fd = open(path, O_RDONLY);
if (fd < 0)
return -1;
if (fstat(fd, &st)) {
@ -364,6 +368,16 @@ static int check_packed_git_idx(const char *path, unsigned long *idx_size_,
if (idx_size != 4*256 + nr * 24 + 20 + 20)
return error("wrong index file size");
/*
* File checksum.
*/
SHA1_Init(&ctx);
SHA1_Update(&ctx, idx_map, idx_size-20);
SHA1_Final(sha1, &ctx);
if (memcmp(sha1, idx_map + idx_size - 20, 20))
return error("index checksum mismatch");
return 0;
}

7
t/t5300-pack-object.sh
View file

@ -163,6 +163,13 @@ test_expect_success \
else :;
fi &&
cp test-1-${packname_1}.pack test-3.pack &&
dd if=/dev/zero of=test-3.idx count=1 bs=1 conv=notrunc seek=1200 &&
if git-verify-pack test-3.pack
then false
else :;
fi &&
:'
test_expect_success \