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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>
This commit is contained in:
Miroslav Rezanina 2021-05-05 03:59:03 -04:00 committed by Kevin Wolf
parent 13d5f87cc3
commit 2d369d6e6e
1 changed files with 1 additions and 1 deletions
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2
block.c
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@ -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) {