From: Johannes Thumshirn Date: Mon, 6 Mar 2017 10:23:35 +0000 (+0100) Subject: zram: set physical queue limits to avoid array out of bounds accesses X-Git-Tag: v4.4.106~40 X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=ca6d40bb082ae3d6f75da2fbd7af5ae77b7a80de;p=thirdparty%2Fkernel%2Fstable.git zram: set physical queue limits to avoid array out of bounds accesses [ 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(). Signed-off-by: Johannes Thumshirn Reviewed-by: Hannes Reinecke Reviewed-by: Sergey Senozhatsky Signed-off-by: Jens Axboe Signed-off-by: Sasha Levin Signed-off-by: Greg Kroah-Hartman --- diff --git a/drivers/block/zram/zram_drv.c b/drivers/block/zram/zram_drv.c index 62a93b685c542..502406c9e6e16 100644 --- a/drivers/block/zram/zram_drv.c +++ b/drivers/block/zram/zram_drv.c @@ -1247,6 +1247,8 @@ 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