diff options
| -rw-r--r-- | sha1_file.c | 25 |
1 files changed, 16 insertions, 9 deletions
diff --git a/sha1_file.c b/sha1_file.c index c13ef6675..cfce7acdb 100644 --- a/sha1_file.c +++ b/sha1_file.c @@ -430,8 +430,9 @@ void pack_report() pack_mapped, peak_pack_mapped); } -static int check_packed_git_idx(const char *path, unsigned long *idx_size_, - void **idx_map_) +static int check_packed_git_idx(const char *path, + unsigned long *idx_size_, + void **idx_map_) { void *idx_map; uint32_t *index; @@ -446,6 +447,10 @@ static int check_packed_git_idx(const char *path, unsigned long *idx_size_, return -1; } idx_size = st.st_size; + if (idx_size < 4 * 256 + 20 + 20) { + close(fd); + return error("index file %s is too small", path); + } idx_map = xmmap(NULL, idx_size, PROT_READ, MAP_PRIVATE, fd, 0); close(fd); @@ -453,25 +458,25 @@ static int check_packed_git_idx(const char *path, unsigned long *idx_size_, *idx_map_ = idx_map; *idx_size_ = idx_size; - /* check index map */ - if (idx_size < 4*256 + 20 + 20) - return error("index file %s is too small", path); - /* a future index format would start with this, as older git * binaries would fail the non-monotonic index check below. * give a nicer warning to the user if we can. */ - if (index[0] == htonl(PACK_IDX_SIGNATURE)) + if (index[0] == htonl(PACK_IDX_SIGNATURE)) { + munmap(idx_map, idx_size); return error("index file %s is a newer version" " and is not supported by this binary" " (try upgrading GIT to a newer version)", path); + } nr = 0; for (i = 0; i < 256; i++) { unsigned int n = ntohl(index[i]); - if (n < nr) + if (n < nr) { + munmap(idx_map, idx_size); return error("non-monotonic index %s", path); + } nr = n; } @@ -482,8 +487,10 @@ static int check_packed_git_idx(const char *path, unsigned long *idx_size_, * - 20-byte SHA1 of the packfile * - 20-byte SHA1 file checksum */ - if (idx_size != 4*256 + nr * 24 + 20 + 20) + if (idx_size != 4*256 + nr * 24 + 20 + 20) { + munmap(idx_map, idx_size); return error("wrong index file size in %s", path); + } return 0; } |