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| author | Matthew Wilcox (Oracle) <willy@infradead.org> | 2024-01-16 21:29:59 +0000 |
|---|---|---|
| committer | Jens Axboe <axboe@kernel.dk> | 2024-01-16 15:02:25 -0700 |
| commit | 7bed6f3d08b7af27b7015da8dc3acf2b9c1f21d7 (patch) | |
| tree | 434bc7943d25e5b21eeaf415c4b338311a1d4bc6 /block/blk-mq-sched.c | |
| parent | be50df31c4e2a69f961a3bb759346d299eaa2b23 (diff) | |
block: Fix iterating over an empty bio with bio_for_each_folio_all
If the bio contains no data, bio_first_folio() calls page_folio() on a
NULL pointer and oopses. Move the test that we've reached the end of
the bio from bio_next_folio() to bio_first_folio().
Reported-by: syzbot+8b23309d5788a79d3eea@syzkaller.appspotmail.com
Reported-by: syzbot+004c1e0fced2b4bc3dcc@syzkaller.appspotmail.com
Fixes: 640d1930bef4 ("block: Add bio_for_each_folio_all()")
Cc: stable@vger.kernel.org
Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Link: https://lore.kernel.org/r/20240116212959.3413014-1-willy@infradead.org
[axboe: add unlikely() to error case]
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'block/blk-mq-sched.c')
0 files changed, 0 insertions, 0 deletions