This is a note to let you know that I've just added the patch titled
scsi: lpfc: Fix list_add() corruption in lpfc_drain_txq()
to the 4.19-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
scsi-lpfc-fix-list_add-corruption-in-lpfc_drain_txq.patch
and it can be found in the queue-4.19 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit 69e66647a33fa0111bf58fef0c73a5bcfe4b6874
Author: James Smart <jsmart2021@xxxxxxxxx>
Date: Fri Sep 10 16:31:46 2021 -0700
scsi: lpfc: Fix list_add() corruption in lpfc_drain_txq()
[ Upstream commit 99154581b05c8fb22607afb7c3d66c1bace6aa5d ]
When parsing the txq list in lpfc_drain_txq(), the driver attempts to pass
the requests to the adapter. If such an attempt fails, a local "fail_msg"
string is set and a log message output. The job is then added to a
completions list for cancellation.
Processing of any further jobs from the txq list continues, but since
"fail_msg" remains set, jobs are added to the completions list regardless
of whether a wqe was passed to the adapter. If successfully added to
txcmplq, jobs are added to both lists resulting in list corruption.
Fix by clearing the fail_msg string after adding a job to the completions
list. This stops the subsequent jobs from being added to the completions
list unless they had an appropriate failure.
Link: https://lore.kernel.org/r/20210910233159.115896-2-jsmart2021@xxxxxxxxx
Co-developed-by: Justin Tee <justin.tee@xxxxxxxxxxxx>
Signed-off-by: Justin Tee <justin.tee@xxxxxxxxxxxx>
Signed-off-by: James Smart <jsmart2021@xxxxxxxxx>
Signed-off-by: Martin K. Petersen <martin.petersen@xxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/drivers/scsi/lpfc/lpfc_sli.c b/drivers/scsi/lpfc/lpfc_sli.c
index 40d6537e64dd6..e72fc88aeb40e 100644
--- a/drivers/scsi/lpfc/lpfc_sli.c
+++ b/drivers/scsi/lpfc/lpfc_sli.c
@@ -19171,6 +19171,7 @@ lpfc_drain_txq(struct lpfc_hba *phba)
fail_msg,
piocbq->iotag, piocbq->sli4_xritag);
list_add_tail(&piocbq->list, &completions);
+ fail_msg = NULL;
}
spin_unlock_irqrestore(&pring->ring_lock, iflags);
}
