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-rw-r--r--sha1_file.c5
1 files changed, 4 insertions, 1 deletions
diff --git a/sha1_file.c b/sha1_file.c
index c2f807f4c..b9d07de15 100644
--- a/sha1_file.c
+++ b/sha1_file.c
@@ -509,7 +509,10 @@ static int check_packed_git_idx(const char *path, struct packed_git *p)
* for offsets larger than 2^31.
*/
unsigned long min_size = 8 + 4*256 + nr*(20 + 4 + 4) + 20 + 20;
- if (idx_size < min_size || idx_size > min_size + (nr - 1)*8) {
+ unsigned long max_size = min_size;
+ if (nr)
+ max_size += (nr - 1)*8;
+ if (idx_size < min_size || idx_size > max_size) {
munmap(idx_map, idx_size);
return error("wrong index file size in %s", path);
}