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scsi: fc: check for rport presence in fc_block_scsi_eh

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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>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
This commit is contained in:
Johannes Thumshirn 2017-10-10 17:31:38 +02:00 committed by Martin K. Petersen
parent a9e170e286
commit 8d30371fd7
1 changed files with 3 additions and 0 deletions
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3
drivers/scsi/scsi_transport_fc.c
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@ -3320,6 +3320,9 @@ 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);