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-rw-r--r--sha1_file.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/sha1_file.c b/sha1_file.c
index 53e25f278c..18dd89b50a 100644
--- a/sha1_file.c
+++ b/sha1_file.c
@@ -1620,6 +1620,8 @@ static int write_buffer(int fd, const void *buf, size_t len)
{
ssize_t size;
+ if (!len)
+ return 0;
size = write_in_full(fd, buf, len);
if (!size)
return error("file write: disk full");