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-rw-r--r--qemu-img.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/qemu-img.c b/qemu-img.c
index 0db8d4f194..0465e4a3a8 100644
--- a/qemu-img.c
+++ b/qemu-img.c
@@ -1224,7 +1224,7 @@ static int img_rebase(int argc, char **argv)
int pnum;
if (compare_sectors(buf_old + written * 512,
- buf_new + written * 512, n, &pnum))
+ buf_new + written * 512, n - written, &pnum))
{
ret = bdrv_write(bs, sector + written,
buf_old + written * 512, pnum);