Re: [PATCH net] net/smc: set the lkey of every SGE in smcr_tx_rdma_writes()

[sashiko-bot@kernel.org]

> From: Bryam Vargas <hexlabsecurity@proton.me>
> 
> smcr_tx_rdma_writes() sets the lkey of an SGE only for a virtually
> contiguous send buffer; for a physically contiguous one it leaves the
> lkey the work request slot already holds. With net.smc.smcr_buf_type=2
> a send buffer falls back to vzalloc() when alloc_pages() fails, so one
> link carries both kinds, and a slot last used by a virtually contiguous
> buffer posts the DMA address of a physically contiguous one under the
> earlier buffer's MR lkey. That write fails, the link goes down and,
> with no link to switch to, the link group is terminated with all of
> its connections.
> 
> Set the lkey on both branches: the MR's for a virtually contiguous
> buffer, local_dma_lkey otherwise.
> 
> Fixes: b8d199451c99 ("net/smc: Allow virtually contiguous sndbufs or RMBs for SMC-R")
> Cc: stable@vger.kernel.org
> Signed-off-by: Bryam Vargas <hexlabsecurity@proton.me>

Sashiko has reviewed this patch and found no issues.

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