diff options
Diffstat (limited to 'sha1_file.c')
| -rw-r--r-- | sha1_file.c | 16 |
1 files changed, 15 insertions, 1 deletions
diff --git a/sha1_file.c b/sha1_file.c index d451a94ef..6b7577dbc 100644 --- a/sha1_file.c +++ b/sha1_file.c @@ -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; } |