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| author | Gustavo A. R. Silva <gustavo@embeddedor.com> | 2018-10-18 18:59:39 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2019-12-01 09:16:44 +0100 |
| commit | 9ed143cf730d6a13415da0a6a3456560bb4bc6cf (patch) | |
| tree | fe50598f7c0d798366d823562c57b6afdb546c23 | |
| parent | ff6618e06cb4548b8ceaed1855ee39976a1f4aaf (diff) | |
| download | linux-stable-9ed143cf730d6a13415da0a6a3456560bb4bc6cf.tar.gz linux-stable-9ed143cf730d6a13415da0a6a3456560bb4bc6cf.tar.bz2 linux-stable-9ed143cf730d6a13415da0a6a3456560bb4bc6cf.zip | |
scsi: hisi_sas: Fix NULL pointer dereference
[ Upstream commit f4445bb93d82a984657b469e63118c2794a4c3d3 ]
There is a NULL pointer dereference in case *slot* happens to be NULL at
lines 1053 and 1878:
struct hisi_sas_cq *cq =
&hisi_hba->cq[slot->dlvry_queue];
Notice that *slot* is being NULL checked at lines 1057 and 1881:
if (slot), which implies it may be NULL.
Fix this by placing the declaration and definition of variable cq, which
contains the pointer dereference slot->dlvry_queue, after slot has been
properly NULL checked.
Addresses-Coverity-ID: 1474515 ("Dereference before null check")
Addresses-Coverity-ID: 1474520 ("Dereference before null check")
Fixes: 584f53fe5f52 ("scsi: hisi_sas: Fix the race between IO completion and timeout for SMP/internal IO")
Signed-off-by: Gustavo A. R. Silva <gustavo@embeddedor.com>
Reviewed-by: Xiang Chen <chenxiang66@hisilicon.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
| -rw-r--r-- | drivers/scsi/hisi_sas/hisi_sas_main.c | 8 |
1 files changed, 4 insertions, 4 deletions
diff --git a/drivers/scsi/hisi_sas/hisi_sas_main.c b/drivers/scsi/hisi_sas/hisi_sas_main.c index d4a2625a4423..f478d1f50dfc 100644 --- a/drivers/scsi/hisi_sas/hisi_sas_main.c +++ b/drivers/scsi/hisi_sas/hisi_sas_main.c @@ -1025,11 +1025,11 @@ static int hisi_sas_exec_internal_tmf_task(struct domain_device *device, if ((task->task_state_flags & SAS_TASK_STATE_ABORTED)) { if (!(task->task_state_flags & SAS_TASK_STATE_DONE)) { struct hisi_sas_slot *slot = task->lldd_task; - struct hisi_sas_cq *cq = - &hisi_hba->cq[slot->dlvry_queue]; dev_err(dev, "abort tmf: TMF task timeout and not done\n"); if (slot) { + struct hisi_sas_cq *cq = + &hisi_hba->cq[slot->dlvry_queue]; /* * flush tasklet to avoid free'ing task * before using task in IO completion @@ -1856,10 +1856,10 @@ hisi_sas_internal_task_abort(struct hisi_hba *hisi_hba, if ((task->task_state_flags & SAS_TASK_STATE_ABORTED)) { if (!(task->task_state_flags & SAS_TASK_STATE_DONE)) { struct hisi_sas_slot *slot = task->lldd_task; - struct hisi_sas_cq *cq = - &hisi_hba->cq[slot->dlvry_queue]; if (slot) { + struct hisi_sas_cq *cq = + &hisi_hba->cq[slot->dlvry_queue]; /* * flush tasklet to avoid free'ing task * before using task in IO completion |