diff options
| author | Anil Gurumurthy <anil.gurumurthy@qlogic.com> | 2015-11-26 03:54:00 -0500 |
|---|---|---|
| committer | Martin K. Petersen <martin.petersen@oracle.com> | 2015-12-02 17:06:45 -0500 |
| commit | 3c3da12d3174891f61f0f2c672da095562f19b92 (patch) | |
| tree | d42fecd5fcd2b39f32ba22b0fc0d84ebd9d7de5f | |
| parent | 889d0d42667c998a099028f845c0be074acb4b90 (diff) | |
| download | linux-stable-3c3da12d3174891f61f0f2c672da095562f19b92.tar.gz linux-stable-3c3da12d3174891f61f0f2c672da095562f19b92.tar.bz2 linux-stable-3c3da12d3174891f61f0f2c672da095562f19b92.zip | |
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>
| -rw-r--r-- | drivers/scsi/bfa/bfad_im.c | 26 |
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); |