Avoid crashing if the private_data pointer happens to be NULL. This has
been seen sometimes when a host reset happens, notably when there are
many LUNs.
Signed-off-by: Mark Rustad <mark.d.rustad@xxxxxxxxx>
Tested-by: Marcus Dennis <marcusx.e.dennis@xxxxxxxxx>
---
include/scsi/scsi_cmnd.h | 8 +++++++-
1 files changed, 7 insertions(+), 1 deletions(-)
diff --git a/include/scsi/scsi_cmnd.h b/include/scsi/scsi_cmnd.h
index 1e11985..ac06cc5 100644
--- a/include/scsi/scsi_cmnd.h
+++ b/include/scsi/scsi_cmnd.h
@@ -134,10 +134,16 @@ struct scsi_cmnd {
static inline struct scsi_driver *scsi_cmd_to_driver(struct scsi_cmnd *cmd)
{
+ struct scsi_driver **sdp;
+
if (!cmd->request->rq_disk)
return NULL;
- return *(struct scsi_driver **)cmd->request->rq_disk->private_data;
+ sdp = (struct scsi_driver **)cmd->request->rq_disk->private_data;
+ if (!sdp)
+ return NULL;
+
+ return *sdp;
}
extern struct scsi_cmnd *scsi_get_command(struct scsi_device *, gfp_t);
--
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