X-Git-Url: https://git.tokkee.org/?a=blobdiff_plain;f=sha1_file.c;h=f9f8d5e91c278000e5869f49ba6a79ddfaf13145;hb=e0a4aae865862549c5f2a65016d4d264843e7914;hp=6b1b5125c8f992927b70ce10c43f2332f5948bc0;hpb=c01f51cc750dbd76e50919bf4e3b94e1b47d2e23;p=git.git

diff --git a/sha1_file.c b/sha1_file.c
index 6b1b5125c..f9f8d5e91 100644
--- a/sha1_file.c
+++ b/sha1_file.c
@@ -1206,6 +1206,11 @@ 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);