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[PATCH 10/12] block/file-posix: fix a possible undefined behavior

From: Pan Nengyuan
Subject: [PATCH 10/12] block/file-posix: fix a possible undefined behavior
Date: Fri, 14 Aug 2020 12:02:39 -0400

local_err is not initialized to NULL, it will cause a assert error as below:
qemu/util/error.c:59: error_setv: Assertion `*errp == NULL' failed.

Fixes: c6447510690
Reported-by: Euler Robot <euler.robot@huawei.com>
Signed-off-by: Pan Nengyuan <pannengyuan@huawei.com>
Cc: Kevin Wolf <kwolf@redhat.com>
Cc: Max Reitz <mreitz@redhat.com>
Cc: Aarushi Mehta <mehta.aaru20@gmail.com>
Cc: qemu-block@nongnu.org
 block/file-posix.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/block/file-posix.c b/block/file-posix.c
index 9a00d4190a..697a7d9eea 100644
--- a/block/file-posix.c
+++ b/block/file-posix.c
@@ -2113,7 +2113,7 @@ static void raw_aio_attach_aio_context(BlockDriverState 
     if (s->use_linux_io_uring) {
-        Error *local_err;
+        Error *local_err = NULL;
         if (!aio_setup_linux_io_uring(new_context, &local_err)) {
             error_reportf_err(local_err, "Unable to use linux io_uring, "
                                          "falling back to thread pool: ");

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