X-Git-Url: https://git.tokkee.org/?a=blobdiff_plain;f=sha1_file.c;h=d9aa0e0a2cd45acbbe3beb6c015f5f9071a22902;hb=c6a4e3f7a78011bd7c1c75521c6d12ac311513f7;hp=88f2151ff31870138a53e40f99f5ae9928b09545;hpb=f342afafceb16b29a9b8718c5f42afaaf6291d78;p=git.git

diff --git a/sha1_file.c b/sha1_file.c
index 88f2151ff..d9aa0e0a2 100644
--- a/sha1_file.c
+++ b/sha1_file.c
@@ -1202,6 +1202,11 @@ void *map_sha1_file(const unsigned char *sha1, unsigned long *size)
 
 		if (!fstat(fd, &st)) {
 			*size = xsize_t(st.st_size);
+			if (!*size) {
+				/* mmap() is forbidden on empty files */
+				error("object file %s is empty", sha1_file_name(sha1));
+				return NULL;
+			}
 			map = xmmap(NULL, *size, PROT_READ, MAP_PRIVATE, fd, 0);
 		}
 		close(fd);