From: James Smart jsmart2021@gmail.com
stable inclusion from stable-v4.19.218 commit b291d147d0268e93ad866f8bc820ea14497abc9b category: bugfix bugzilla: https://gitee.com/src-openeuler/kernel/issues/I9FNFI CVE: CVE-2021-47203
Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=...
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[ 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@gmail.com Co-developed-by: Justin Tee justin.tee@broadcom.com Signed-off-by: Justin Tee justin.tee@broadcom.com Signed-off-by: James Smart jsmart2021@gmail.com Signed-off-by: Martin K. Petersen martin.petersen@oracle.com Signed-off-by: Sasha Levin sashal@kernel.org Signed-off-by: Zheng Zucheng zhengzucheng@huawei.com --- drivers/scsi/lpfc/lpfc_sli.c | 1 + 1 file changed, 1 insertion(+)
diff --git a/drivers/scsi/lpfc/lpfc_sli.c b/drivers/scsi/lpfc/lpfc_sli.c index a801917d3c19..6c775a8bfb9e 100644 --- a/drivers/scsi/lpfc/lpfc_sli.c +++ b/drivers/scsi/lpfc/lpfc_sli.c @@ -19159,6 +19159,7 @@ 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); }