On Tue, Sep 15 2020 at 11:53pm -0400, Eric Biggers <ebiggers@xxxxxxxxxx> wrote: > From: Eric Biggers <ebiggers@xxxxxxxxxx> > > blk_crypto_rq_bio_prep() assumes its gfp_mask argument always includes > __GFP_DIRECT_RECLAIM, so that the mempool_alloc() will always succeed. > > However, blk_crypto_rq_bio_prep() might be called with GFP_ATOMIC via > setup_clone() in drivers/md/dm-rq.c. > > This case isn't currently reachable with a bio that actually has an > encryption context. However, it's fragile to rely on this. Just make > blk_crypto_rq_bio_prep() able to fail. > > Cc: Miaohe Lin <linmiaohe@xxxxxxxxxx> > Suggested-by: Satya Tangirala <satyat@xxxxxxxxxx> > Signed-off-by: Eric Biggers <ebiggers@xxxxxxxxxx> Reviewed-by: Mike Snitzer <snitzer@xxxxxxxxxx>
