* [PATCH v3] scsi: fc: check for rport presence in fc_block_scsi_eh
@ 2017-10-10 15:31 Johannes Thumshirn
2017-10-11 18:33 ` Martin K. Petersen
0 siblings, 1 reply; 2+ messages in thread
From: Johannes Thumshirn @ 2017-10-10 15:31 UTC (permalink / raw)
To: Martin K . Petersen
Cc: Linux Kernel Mailinglist, Linux SCSI Mailinglist, Johannes Thumshirn
Coverity-scan recently found a possible NULL pointer dereference in
fc_block_scsi_eh() as starget_to_rport() either returns the rport for
the startget or NULL.
While it is rather unlikely to have fc_block_scsi_eh() called without
an rport associated it's a good idea to catch potential misuses of the
API gracefully.
Signed-off-by: Johannes Thumshirn <jthumshirn@suse.de>
Reviewed-by: Bart Van Assche <bart.vanassche@wdc.com>
Reviewed-by: Hannes Reinecke <hare@suse.de>
---
Martin, I'm not sure if I have already sent it out or not if I already did
send this v3 please ignore it.
Changes since v2:
- return FAST_IO_FAIL instead of 0 (Steffen)
Changes since v1:
- s/WARN_ON/WARN_ON_ONCE/ (Bart)
---
drivers/scsi/scsi_transport_fc.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/drivers/scsi/scsi_transport_fc.c b/drivers/scsi/scsi_transport_fc.c
index ba9d70f8a6a1..18f56a124b6c 100644
--- a/drivers/scsi/scsi_transport_fc.c
+++ b/drivers/scsi/scsi_transport_fc.c
@@ -3328,6 +3328,9 @@ int fc_block_scsi_eh(struct scsi_cmnd *cmnd)
{
struct fc_rport *rport = starget_to_rport(scsi_target(cmnd->device));
+ if (WARN_ON_ONCE(!rport))
+ return FAST_IO_FAIL;
+
return fc_block_rport(rport);
}
EXPORT_SYMBOL(fc_block_scsi_eh);
--
2.13.5
^ permalink raw reply related [flat|nested] 2+ messages in thread
* Re: [PATCH v3] scsi: fc: check for rport presence in fc_block_scsi_eh
2017-10-10 15:31 [PATCH v3] scsi: fc: check for rport presence in fc_block_scsi_eh Johannes Thumshirn
@ 2017-10-11 18:33 ` Martin K. Petersen
0 siblings, 0 replies; 2+ messages in thread
From: Martin K. Petersen @ 2017-10-11 18:33 UTC (permalink / raw)
To: Johannes Thumshirn
Cc: Martin K . Petersen, Linux Kernel Mailinglist, Linux SCSI Mailinglist
Johannes,
> Coverity-scan recently found a possible NULL pointer dereference in
> fc_block_scsi_eh() as starget_to_rport() either returns the rport for
> the startget or NULL.
>
> While it is rather unlikely to have fc_block_scsi_eh() called without
> an rport associated it's a good idea to catch potential misuses of the
> API gracefully.
Applied to 4.14/scsi-fixes. Thanks!
--
Martin K. Petersen Oracle Linux Engineering
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2017-10-10 15:31 [PATCH v3] scsi: fc: check for rport presence in fc_block_scsi_eh Johannes Thumshirn
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