[Qemu-devel] [PATCH] qed: don't pass NULL to memcpy

[Pavel Borzenkov]

Spotted by Clang Analyzer

Signed-off-by: Pavel Borzenkov <address@hidden>
---
 block/qed.c |    6 ++++--
 1 files changed, 4 insertions(+), 2 deletions(-)

diff --git a/block/qed.c b/block/qed.c
index c3e45af..e6720db 100644
--- a/block/qed.c
+++ b/block/qed.c
@@ -1424,8 +1424,10 @@ static int bdrv_qed_change_backing_file(BlockDriverState 
*bs,
     memcpy(buffer, &le_header, sizeof(le_header));
     buffer_len = sizeof(le_header);
 
-    memcpy(buffer + buffer_len, backing_file, backing_file_len);
-    buffer_len += backing_file_len;
+    if (backing_file) {
+        memcpy(buffer + buffer_len, backing_file, backing_file_len);
+        buffer_len += backing_file_len;
+    }
 
     /* Write new header */
     ret = bdrv_pwrite_sync(bs->file, 0, buffer, buffer_len);
-- 
1.7.0.4