From: Douglas Miller Date: Fri, 20 Oct 2017 13:17:22 +0000 (-0500) Subject: scsi: qla2xxx: Fix oops in qla2x00_probe_one error path X-Git-Url: http://git.lede-project.org./?a=commitdiff_plain;h=e2532b4af6366931e6f66b60338cf6b08a4b32ae;p=openwrt%2Fstaging%2Fblogic.git 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 Acked-by: Himanshu Madhani Signed-off-by: Martin K. Petersen --- diff --git a/drivers/scsi/qla2xxx/qla_os.c b/drivers/scsi/qla2xxx/qla_os.c index 3bd956d3bc5d..dce42a416876 100644 --- a/drivers/scsi/qla2xxx/qla_os.c +++ b/drivers/scsi/qla2xxx/qla_os.c @@ -3212,6 +3212,7 @@ qla2x00_probe_one(struct pci_dev *pdev, const struct pci_device_id *id) ql_log(ql_log_fatal, base_vha, 0x00ed, "Failed to start DPC thread.\n"); ret = PTR_ERR(ha->dpc_thread); + ha->dpc_thread = NULL; goto probe_failed; } ql_dbg(ql_dbg_init, base_vha, 0x00ee,