commit e2532b4af6366931e6f66b60338cf6b08a4b32ae
author Douglas Miller <dougmill@linux.vnet.ibm.com> Fri Oct 20 08:17:22 2017 -0500
committer Martin K. Petersen <martin.petersen@oracle.com> Tue Oct 31 08:06:07 2017 -0400
tree 45d046e60b13c6690c62be29b032d7bdd25683a8
parent 8fe8ffb12c81b36877984274db184953c337db73

scsi: qla2xxx: Fix oops in qla2x00_probe_one error path

On error, kthread_create() returns an errno-encoded pointer, not NULL.
The routine qla2x00_probe_one() detects the error case and jumps to
probe_failed, but has already assigned the return value from
kthread_create() to ha->dpc_thread.  Then probe_failed checks to see if
ha->dpc_thread is not NULL before doing cleanup on it. Since in the
error case this is also not NULL, it ends up trying to access an invalid
task pointer.

Solution is to assign NULL to ha->dpc_thread in the error path to avoid
kthread cleanup in that case.

Signed-off-by: Douglas Miller <dougmill@linux.vnet.ibm.com>
Acked-by: Himanshu Madhani <himanshu.madhani@cavium.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>