Re: [PATCH] block/virtio-blk: Fix memory leak from virtio_blk_zone_report

[Michael Tokarev]

04.04.2024 15:00, Zheyu Ma wrote:
> This modification ensures that in scenarios where the buffer size is
> insufficient for a zone report, the function will now properly set an
> error status and proceed to a cleanup label, instead of merely
> returning.
>
> The following ASAN log reveals it:
>
> ==1767400==ERROR: LeakSanitizer: detected memory leaks
> Direct leak of 312 byte(s) in 1 object(s) allocated from:
>      #0 0x64ac7b3280cd in malloc 
> llvm/compiler-rt/lib/asan/asan_malloc_linux.cpp:129:3
>      #1 0x735b02fb9738 in g_malloc 
> (/lib/x86_64-linux-gnu/libglib-2.0.so.0+0x5e738)
>      #2 0x64ac7d23be96 in virtqueue_split_pop hw/virtio/virtio.c:1612:12
>      #3 0x64ac7d23728a in virtqueue_pop hw/virtio/virtio.c:1783:16
>      #4 0x64ac7cfcaacd in virtio_blk_get_request hw/block/virtio-blk.c:228:27
>      #5 0x64ac7cfca7c7 in virtio_blk_handle_vq hw/block/virtio-blk.c:1123:23
>      #6 0x64ac7cfecb95 in virtio_blk_handle_output hw/block/virtio-blk.c:1157:5
>
> Signed-off-by: Zheyu Ma <zheyuma97@gmail.com>
> ---
>   hw/block/virtio-blk.c | 3 ++-
>   1 file changed, 2 insertions(+), 1 deletion(-)
>
> diff --git a/hw/block/virtio-blk.c b/hw/block/virtio-blk.c
> index 92de315f17..bb86e65f65 100644
> --- a/hw/block/virtio-blk.c
> +++ b/hw/block/virtio-blk.c
> @@ -768,7 +768,8 @@ static void virtio_blk_handle_zone_report(VirtIOBlockReq 
> *req,
>               sizeof(struct virtio_blk_zone_report) +
>               sizeof(struct virtio_blk_zone_descriptor)) {
>           virtio_error(vdev, "in buffer too small for zone report");
> -        return;
> +        err_status = VIRTIO_BLK_S_ZONE_INVALID_CMD;
> +        goto out;
>       }
>   
>       /* start byte offset of the zone report */

Is this a -stable material, or is it not worth picking up for older release(s)?

Thanks,

/mjt