Patch "net/mlx5e: Fix dangling page pointer on DMA mapping error" has been added to the 4.12-stable tree

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

net/mlx5e: Fix dangling page pointer on DMA mapping error

to the 4.12-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:
net-mlx5e-fix-dangling-page-pointer-on-dma-mapping-error.patch
and it can be found in the queue-4.12 subdirectory.

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

From: Eran Ben Elisha <[email protected]>
Date: Wed, 16 Aug 2017 14:37:11 +0300
Subject: net/mlx5e: Fix dangling page pointer on DMA mapping error

From: Eran Ben Elisha <[email protected]>

[ Upstream commit 0556ce72ab16156af6c94cdc7964e4310acc97c0 ]

Function mlx5e_dealloc_rx_wqe is using page pointer value as an indication to valid DMA mapping. In case that the mapping failed, we released the page but kept the dangling pointer. Store the page pointer only after the DMA mapping passed to avoid invalid page DMA unmap.

---
 drivers/net/ethernet/mellanox/mlx5/core/en_rx.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

@@ -216,13 +216,13 @@ static inline int mlx5e_page_alloc_mappe
 	if (unlikely(!page))
 		return -ENOMEM;
 
-	dma_info->page = page;
 	dma_info->addr = dma_map_page(rq->pdev, page, 0,
 				      RQ_PAGE_SIZE(rq), rq->buff.map_dir);
 	if (unlikely(dma_mapping_error(rq->pdev, dma_info->addr))) {
 		put_page(page);
 		return -ENOMEM;
 	}
+	dma_info->page = page;
 
 	return 0;
 }

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

queue-4.12/net-mlx5e-fix-dangling-page-pointer-on-dma-mapping-error.patch