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dm crypt: fix avoid cloned bio ref after free

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Do not access the bio after generic_make_request

We should never access a bio after generic_make_request - there's no guarantee
it still exists.

Signed-off-by: Olaf Kirch <olaf.kirch@oracle.com>
Signed-off-by: Alasdair G Kergon <agk@redhat.com>
Cc: Jens Axboe <jens.axboe@oracle.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Olaf Kirch 2007-05-09 02:32:52 -07:00 committed by Linus Torvalds
parent 027581f351
commit 98221eb757
1 changed files with 4 additions and 1 deletions
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5
drivers/md/dm-crypt.c
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@ -655,9 +655,12 @@ static void process_write(struct crypt_io *io)
generic_make_request(clone); generic_make_request(clone);
/* Do not reference clone after this - it
* may be gone already. */
/* out of memory -> run queues */ /* out of memory -> run queues */
if (remaining) if (remaining)
congestion_wait(bio_data_dir(clone), HZ/100); congestion_wait(WRITE, HZ/100);
} }
} }