[Qemu-devel] [PATCH] qemu-img: Fix segfault during rebase

[Kevin Wolf <kwolf@redhat.com>]

This fixes a possible read beyond the end of the temporary buffers used for
comparing data in the old and the new backing file.

Signed-off-by: Kevin Wolf <kwolf@redhat.com>
---
 qemu-img.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/qemu-img.c b/qemu-img.c
index 250d892..258dc62 100644
--- a/qemu-img.c
+++ b/qemu-img.c
@@ -1225,7 +1225,7 @@ 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);
-- 
1.6.6