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

[Stefano Garzarella]

On Fri, Aug 14, 2020 at 12:02:39PM -0400, Pan Nengyuan wrote:
> 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(-)

Reviewed-by: Stefano Garzarella <sgarzare@redhat.com>

Thanks,
Stefano

> 
> 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 
> *bs,
>  #endif
>  #ifdef CONFIG_LINUX_IO_URING
>      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: ");
> -- 
> 2.18.2
> 
>