ACK/Cmnt: [SRU][K:master-next][PATCH 0/1] block: handle bio_split_to_limits() NULL return

[Tim Gardner]

On 5/30/23 11:25 AM, Alexander Mikhalitsyn wrote:
> BugLink: https://bugs.launchpad.net/bugs/2020901
> 
> [Impact]
> System crash/hung as a consequence of null pointer dereference.
> 
> [Fix]
> port an appropriate patch from -stable upstream tree
> 
> [Test]
> We have a stable reproducer on the LXD/LXC CI.
> 
> [Where problems could occur]
> We've met this problem with Qemu VM (LVM storage).
> 
> Jens Axboe (1):
>    block: handle bio_split_to_limits() NULL return
> 
>   block/blk-merge.c             | 4 +++-
>   block/blk-mq.c                | 3 +++
>   drivers/block/drbd/drbd_req.c | 2 ++
>   drivers/block/pktcdvd.c       | 2 ++
>   drivers/block/ps3vram.c       | 2 ++
>   drivers/md/dm.c               | 2 ++
>   drivers/md/md.c               | 2 ++
>   drivers/nvme/host/multipath.c | 2 ++
>   drivers/s390/block/dcssblk.c  | 2 ++
>   9 files changed, 20 insertions(+), 1 deletion(-)
> 
Acked-by: Tim Gardner <tim.gardner at canonical.com>

Your description of the backport is a little sparse. In this case its 
mostly context adjustments, except for block/blk-mq.c which required 
some code changes.
-- 
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Tim Gardner
Canonical, Inc