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authorAnil Gurumurthy <anil.gurumurthy@qlogic.com>2015-11-26 11:54:00 +0300
committerMartin K. Petersen <martin.petersen@oracle.com>2015-12-03 01:06:45 +0300
commit3c3da12d3174891f61f0f2c672da095562f19b92 (patch)
treed42fecd5fcd2b39f32ba22b0fc0d84ebd9d7de5f /drivers/scsi/bfa
parent889d0d42667c998a099028f845c0be074acb4b90 (diff)
downloadlinux-3c3da12d3174891f61f0f2c672da095562f19b92.tar.xz
bfa: Fix for crash when bfa_itnim is NULL
Fix a very corner case when the port gets disconnected and the BFA and FCS layers clean up references to the IT nexus. During this window if a task management command is issued by the SCSI-ML and ends up referencing a NULL itnim, it could lead to a crash. Signed-off-by: Sudarsana Kalluru <sudarsana.kalluru@qlogic.com> Signed-off-by: Anil Gurumurthy <anil.gurumurthy@qlogic.com> Reviewed-by: Johannes Thumshirn <jthumshirn@suse.de> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Diffstat (limited to 'drivers/scsi/bfa')
-rw-r--r--drivers/scsi/bfa/bfad_im.c26
1 files changed, 26 insertions, 0 deletions
diff --git a/drivers/scsi/bfa/bfad_im.c b/drivers/scsi/bfa/bfad_im.c
index efcb2470f40a..2c0cf8a46a47 100644
--- a/drivers/scsi/bfa/bfad_im.c
+++ b/drivers/scsi/bfa/bfad_im.c
@@ -272,6 +272,19 @@ bfad_im_target_reset_send(struct bfad_s *bfad, struct scsi_cmnd *cmnd,
cmnd->host_scribble = NULL;
cmnd->SCp.Status = 0;
bfa_itnim = bfa_fcs_itnim_get_halitn(&itnim->fcs_itnim);
+ /*
+ * bfa_itnim can be NULL if the port gets disconnected and the bfa
+ * and fcs layers have cleaned up their nexus with the targets and
+ * the same has not been cleaned up by the shim
+ */
+ if (bfa_itnim == NULL) {
+ bfa_tskim_free(tskim);
+ BFA_LOG(KERN_ERR, bfad, bfa_log_level,
+ "target reset, bfa_itnim is NULL\n");
+ rc = BFA_STATUS_FAILED;
+ goto out;
+ }
+
memset(&scsilun, 0, sizeof(scsilun));
bfa_tskim_start(tskim, bfa_itnim, scsilun,
FCP_TM_TARGET_RESET, BFAD_TARGET_RESET_TMO);
@@ -327,6 +340,19 @@ bfad_im_reset_lun_handler(struct scsi_cmnd *cmnd)
cmnd->SCp.ptr = (char *)&wq;
cmnd->SCp.Status = 0;
bfa_itnim = bfa_fcs_itnim_get_halitn(&itnim->fcs_itnim);
+ /*
+ * bfa_itnim can be NULL if the port gets disconnected and the bfa
+ * and fcs layers have cleaned up their nexus with the targets and
+ * the same has not been cleaned up by the shim
+ */
+ if (bfa_itnim == NULL) {
+ bfa_tskim_free(tskim);
+ BFA_LOG(KERN_ERR, bfad, bfa_log_level,
+ "lun reset, bfa_itnim is NULL\n");
+ spin_unlock_irqrestore(&bfad->bfad_lock, flags);
+ rc = FAILED;
+ goto out;
+ }
int_to_scsilun(cmnd->device->lun, &scsilun);
bfa_tskim_start(tskim, bfa_itnim, scsilun,
FCP_TM_LUN_RESET, BFAD_LUN_RESET_TMO);