block: fix merging data-less bios

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The data segment gaps the block layer tracks doesn't apply to bio's that
don't have data. Skip calculating this to fix a NULL pointer access.

Fixes: 2f6b2565d4 ("block: accumulate memory segment gaps per bio")
Reported-by: Matthew Wilcox <willy@infradead.org>
Signed-off-by: Keith Busch <kbusch@kernel.org>
Reviewed-by: Yu Kuai <yukuai@fnnas.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jens Axboe <axboe@kernel.dk>

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Keith Busch 2025-11-11 06:06:20 -08:00 • committed by Jens Axboe

parent 727a440278

commit fd9ecd0052

1 changed files with 3 additions and 0 deletions

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block/blk-merge.c

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