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Date: Tue, 8 May 2007 20:44:42 +0100 From: Alasdair G Kergon <agk@...hat.com> To: Andrew Morton <akpm@...ux-foundation.org> Cc: dm-devel@...hat.com, linux-kernel@...r.kernel.org, olaf.kirch@...cle.com Subject: [2.6.22 PATCH 05/26] dm crypt: fix avoid cloned bio ref after free From: olaf.kirch@...cle.com 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@...cle.com Signed-off-by: Alasdair G Kergon <agk@...hat.com> --- drivers/md/dm-crypt.c | 5 ++++- 1 files changed, 4 insertions(+), 1 deletion(-) Index: linux-2.6.21/drivers/md/dm-crypt.c =================================================================== --- linux-2.6.21.orig/drivers/md/dm-crypt.c 2007-05-01 17:40:48.000000000 +0100 +++ linux-2.6.21/drivers/md/dm-crypt.c 2007-05-01 17:40:48.000000000 +0100 @@ -655,9 +655,12 @@ static void process_write(struct crypt_i generic_make_request(clone); + /* Do not reference clone after this - it + * may be gone already. */ + /* out of memory -> run queues */ if (remaining) - congestion_wait(bio_data_dir(clone), HZ/100); + congestion_wait(WRITE, HZ/100); } } - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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