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block: make bio_check_eod work for zero sized devices
Since the dawn of time bio_check_eod has a check for a non-zero size of
the device. This doesn't really make any sense as we never want to send
I/O to a device that's been set to zero size, or never moved out of that.
I am a bit surprised we haven't caught this for a long time, but the
removal of the extra validation inside of zram caused syzbot to trip
over this issue recently. I've added a Fixes tag for that commit, but
the issue really goes back way before git history.
Fixes: 9fe95babc7
("zram: remove valid_io_request")
Reported-by: syzbot+b8d61a58b7c7ebd2c8e0@syzkaller.appspotmail.com
Signed-off-by: Christoph Hellwig <hch@lst.de>
Link: https://lore.kernel.org/r/20230524060538.1593686-1-hch@lst.de
Signed-off-by: Jens Axboe <axboe@kernel.dk>
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@ -520,7 +520,7 @@ static inline int bio_check_eod(struct bio *bio)
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sector_t maxsector = bdev_nr_sectors(bio->bi_bdev);
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unsigned int nr_sectors = bio_sectors(bio);
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if (nr_sectors && maxsector &&
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if (nr_sectors &&
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(nr_sectors > maxsector ||
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bio->bi_iter.bi_sector > maxsector - nr_sectors)) {
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pr_info_ratelimited("%s: attempt to access beyond end of device\n"
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