From 36008cf118235cee49b6753455f33b6f2c3a7543 Mon Sep 17 00:00:00 2001 From: Chad Dupuis Date: Thu, 3 Oct 2013 03:21:13 -0400 Subject: [PATCH] [SCSI] qla2xxx: Fix request queue null dereference. If an invalid IOCB is returned on the response queue then the index into the request queue map could be invalid and could return to us a bogus value. This could cause us to try to deference an invalid pointer and cause an exception. If we encounter this condition, simply return as no context can be established for this response. Signed-off-by: Chad Dupuis Signed-off-by: Saurav Kashyap Signed-off-by: James Bottomley --- drivers/scsi/qla2xxx/qla_dbg.c | 2 +- drivers/scsi/qla2xxx/qla_isr.c | 9 +++++++++ 2 files changed, 10 insertions(+), 1 deletion(-) diff --git a/drivers/scsi/qla2xxx/qla_dbg.c b/drivers/scsi/qla2xxx/qla_dbg.c index 2ef497ebadc0..ee5c1833eb73 100644 --- a/drivers/scsi/qla2xxx/qla_dbg.c +++ b/drivers/scsi/qla2xxx/qla_dbg.c @@ -20,7 +20,7 @@ * | Device Discovery | 0x2095 | 0x2020-0x2022, | * | | | 0x2011-0x2012, | * | | | 0x2016 | - * | Queue Command and IO tracing | 0x3058 | 0x3006-0x300b | + * | Queue Command and IO tracing | 0x3059 | 0x3006-0x300b | * | | | 0x3027-0x3028 | * | | | 0x303d-0x3041 | * | | | 0x302d,0x3033 | diff --git a/drivers/scsi/qla2xxx/qla_isr.c b/drivers/scsi/qla2xxx/qla_isr.c index df1b30ba938c..ff9c86b1a0d8 100644 --- a/drivers/scsi/qla2xxx/qla_isr.c +++ b/drivers/scsi/qla2xxx/qla_isr.c @@ -1957,6 +1957,15 @@ qla2x00_status_entry(scsi_qla_host_t *vha, struct rsp_que *rsp, void *pkt) que = MSW(sts->handle); req = ha->req_q_map[que]; + /* Check for invalid queue pointer */ + if (req == NULL || + que >= find_first_zero_bit(ha->req_qid_map, ha->max_req_queues)) { + ql_dbg(ql_dbg_io, vha, 0x3059, + "Invalid status handle (0x%x): Bad req pointer. req=%p, " + "que=%u.\n", sts->handle, req, que); + return; + } + /* Validate handle. */ if (handle < req->num_outstanding_cmds) sp = req->outstanding_cmds[handle];