From: Ming Lei Date: Sat, 11 Jan 2020 12:57:43 +0000 (+0800) Subject: block: fix get_max_segment_size() overflow on 32bit arch X-Git-Url: http://git.lede-project.org./?a=commitdiff_plain;h=4a2f704eb2d831a2d73d7f4cdd54f45c49c3c353;p=openwrt%2Fstaging%2Fblogic.git block: fix get_max_segment_size() overflow on 32bit arch Commit 429120f3df2d starts to take account of segment's start dma address when computing max segment size, and data type of 'unsigned long' is used to do that. However, the segment mask may be 0xffffffff, so the figured out segment size may be overflowed in case of zero physical address on 32bit arch. Fix the issue by returning queue_max_segment_size() directly when that happens. Fixes: 429120f3df2d ("block: fix splitting segments on boundary masks") Reported-by: Guenter Roeck Tested-by: Guenter Roeck Cc: Christoph Hellwig Tested-by: Steven Rostedt (VMware) Signed-off-by: Ming Lei Signed-off-by: Jens Axboe --- diff --git a/block/blk-merge.c b/block/blk-merge.c index 347782a24a35..1534ed736363 100644 --- a/block/blk-merge.c +++ b/block/blk-merge.c @@ -164,8 +164,13 @@ static inline unsigned get_max_segment_size(const struct request_queue *q, unsigned long mask = queue_segment_boundary(q); offset = mask & (page_to_phys(start_page) + offset); - return min_t(unsigned long, mask - offset + 1, - queue_max_segment_size(q)); + + /* + * overflow may be triggered in case of zero page physical address + * on 32bit arch, use queue's max segment size when that happens. + */ + return min_not_zero(mask - offset + 1, + (unsigned long)queue_max_segment_size(q)); } /**