Patch "zram: set physical queue limits to avoid array out of bounds accesses" has been added to the 4.9-stable tree

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

zram: set physical queue limits to avoid array out of bounds accesses

to the 4.9-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:
zram-set-physical-queue-limits-to-avoid-array-out-of-bounds-accesses.patch
and it can be found in the queue-4.9 subdirectory.

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

From: Johannes Thumshirn <[email protected]>
Date: Mon, 6 Mar 2017 11:23:35 +0100
Subject: zram: set physical queue limits to avoid array out of bounds accesses

From: Johannes Thumshirn <[email protected]>

[ Upstream commit 0bc315381fe9ed9fb91db8b0e82171b645ac008f ]

zram can handle at most SECTORS_PER_PAGE sectors in a bio's bvec. When using the NVMe over Fabrics loopback target which potentially sends a huge bulk of pages attached to the bio's bvec this results in a kernel panic because of array out of bounds accesses in zram_decompress_page().

---
 drivers/block/zram/zram_drv.c |    2 ++
 1 file changed, 2 insertions(+)

@@ -1286,6 +1286,8 @@ static int zram_add(void)
 	blk_queue_io_min(zram->disk->queue, PAGE_SIZE);
 	blk_queue_io_opt(zram->disk->queue, PAGE_SIZE);
 	zram->disk->queue->limits.discard_granularity = PAGE_SIZE;
+	zram->disk->queue->limits.max_sectors = SECTORS_PER_PAGE;
+	zram->disk->queue->limits.chunk_sectors = 0;
 	blk_queue_max_discard_sectors(zram->disk->queue, UINT_MAX);
 	/*
 	 * zram_bio_discard() will clear all logical blocks if logical block

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

queue-4.9/zram-set-physical-queue-limits-to-avoid-array-out-of-bounds-accesses.patch