From ab073abf6d974d3fe998fc6731ca80e2b57ffd69 Mon Sep 17 00:00:00 2001 From: Jens Axboe Date: Mon, 22 Sep 2025 05:55:41 -0600 Subject: [PATCH] block: fix EOD return for device with nr_sectors == 0 A recent commit skipped dumping the usual "attempt to access beyond end of device" message if the device size is 0 sectors, as that's a common pattern for devices that have been hot removed. But while it stopped that message, it also prevented returning -EIO for that condition. Reinstate the -EIO return, while retaining the quiet operation for triggering EOD for a device with 0 sectors. Reported-by: syzbot+4b12286339fe4c2700c1@syzkaller.appspotmail.com Reported-by: Sahil Chandna Fixes: d0a2b527d8c3 ("block: tone down bio_check_eod") Tested-by: Sahil Chandna Signed-off-by: Jens Axboe --- block/blk-core.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/block/blk-core.c b/block/blk-core.c index 4201504158a17..a27185cd8edea 100644 --- a/block/blk-core.c +++ b/block/blk-core.c @@ -557,9 +557,11 @@ static inline int bio_check_eod(struct bio *bio) sector_t maxsector = bdev_nr_sectors(bio->bi_bdev); unsigned int nr_sectors = bio_sectors(bio); - if (nr_sectors && maxsector && + if (nr_sectors && (nr_sectors > maxsector || bio->bi_iter.bi_sector > maxsector - nr_sectors)) { + if (!maxsector) + return -EIO; pr_info_ratelimited("%s: attempt to access beyond end of device\n" "%pg: rw=%d, sector=%llu, nr_sectors = %u limit=%llu\n", current->comm, bio->bi_bdev, bio->bi_opf, -- 2.47.3