Patch "IB/mlx5: Fix incorrect size of klms in the memory region" has been added to the 4.15-stable tree

This is a note to let you know that I've just added the patch titled

IB/mlx5: Fix incorrect size of klms in the memory region

to the 4.15-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
ib-mlx5-fix-incorrect-size-of-klms-in-the-memory-region.patch
and it can be found in the queue-4.15 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree, please let <[email protected]> know about it.

From: Sergey Gorenko <[email protected]>
Date: Sun, 25 Feb 2018 13:39:48 +0200
Subject: IB/mlx5: Fix incorrect size of klms in the memory region

From: Sergey Gorenko <[email protected]>

commit da343b6d90e11132f1e917d865d88ee35d6e6d00 upstream.

The value of mr->ndescs greater than mr->max_descs is set in the function mlx5_ib_sg_to_klms() if sg_nents is greater than mr->max_descs. This is an invalid value and it causes the following error when registering mr:

mlx5_0:dump_cqe:276:(pid 193): dump error cqe 00000000: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00000010: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00000020: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00000030: 00 00 00 00 0f 00 78 06 25 00 00 8b 08 1e 8f d3

---
 drivers/infiniband/hw/mlx5/mr.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

@@ -1813,7 +1813,6 @@ mlx5_ib_sg_to_klms(struct mlx5_ib_mr *mr
 
 	mr->ibmr.iova = sg_dma_address(sg) + sg_offset;
 	mr->ibmr.length = 0;
-	mr->ndescs = sg_nents;
 
 	for_each_sg(sgl, sg, sg_nents, i) {
 		if (unlikely(i >= mr->max_descs))

@@ -1825,6 +1824,7 @@ mlx5_ib_sg_to_klms(struct mlx5_ib_mr *mr
 
 		sg_offset = 0;
 	}
+	mr->ndescs = i;
 
 	if (sg_offset_p)
 		*sg_offset_p = sg_offset;

Patches currently in stable-queue which might be from [email protected] are

queue-4.15/ib-mlx5-fix-incorrect-size-of-klms-in-the-memory-region.patch