Prevent compiler warning on block.c

Commit 3108a15cf (block: introduce bdrv_drop_filter()) introduced
uninitialized variable to_cow_parent in bdrv_replace_node_common
function that is used only when detach_subchain is true. It is used in
two places. First if block properly initialize the variable and second
block use it.

However, compiler may treat these two blocks as two independent cases so
it thinks first block can fail test and second one pass (although both
use same condition). This cause warning that variable can be
uninitialized in second block.

The warning was observed with GCC 8.4.1 and 11.0.1.

To prevent this warning, initialize the variable with NULL.

Signed-off-by: Miroslav Rezanina <mrezanin@redhat.com>
Message-Id: <1162368493.17178530.1620201543649.JavaMail.zimbra@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>

diff --git a/block.c b/block.c
index 1d37f133a8233cf01d8fd0438115cdc7420bcd97..3e277855e7c0d11b6b3a76088f431f14baf33ba1 100644 (file)
--- a/block.c
+++ b/block.c
@@ -4866,7 +4866,7 @@ static int bdrv_replace_node_common(BlockDriverState *from,
     Transaction *tran = tran_new();
     g_autoptr(GHashTable) found = NULL;
     g_autoptr(GSList) refresh_list = NULL;
-    BlockDriverState *to_cow_parent;
+    BlockDriverState *to_cow_parent = NULL;
     int ret;
 
     if (detach_subchain) {