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Commit 0bc31538 authored by Johannes Thumshirn's avatar Johannes Thumshirn Committed by Jens Axboe
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zram: set physical queue limits to avoid array out of bounds accesses 



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: default avatarJohannes Thumshirn <jthumshirn@suse.de>
Reviewed-by: default avatarHannes Reinecke <hare@suse.com>
Reviewed-by: default avatarSergey Senozhatsky <sergey.senozhatsky@gmail.com>
Signed-off-by: default avatarJens Axboe <axboe@fb.com>
parent 01388df3

drivers/block/zram/zram_drv.c

+2 −0
Original line number Diff line number Diff line
@@ -1189,6 +1189,8 @@ 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