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[PULL,01/24] Prevent compiler warning on block.c

Message ID 20210630160206.276439-2-kwolf@redhat.com
State New
Headers show
Series [PULL,01/24] Prevent compiler warning on block.c | expand

Commit Message

Kevin Wolf June 30, 2021, 4:01 p.m. UTC 
From: Miroslav Rezanina <mrezanin@redhat.com>

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>
---
 block.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
diff mbox series

Patch

diff --git a/block.c b/block.c
index 1d37f133a8..3e277855e7 100644
--- 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) {