IB/srp: Fix use-after-free in srp_reset_req()

srp_free_req() uses the scsi_cmnd structure contents to unmap
buffers, so we must invoke srp_free_req() before we release
ownership of that structure.

Signed-off-by: Bart Van Assche <bvanassche@acm.org>
Acked-by: David Dillow <dillowda@ornl.gov>
Cc: <stable@vger.kernel.org>
Signed-off-by: Roland Dreier <roland@purestorage.com>

1 files changed, 1 insertions, 1 deletions

diff --git a/drivers/infiniband/ulp/srp/ib_srp.c b/drivers/infiniband/ulp/srp/ib_srp.c
index 1b5b0c730054..ac66e6b43ee2 100644
--- a/drivers/infiniband/ulp/srp/ib_srp.c
+++ b/drivers/infiniband/ulp/srp/ib_srp.c
@@ -638,9 +638,9 @@ static void srp_reset_req(struct srp_target_port *target, struct srp_request *re
         struct scsi_cmnd *scmnd = srp_claim_req(target, req, NULL);
 
         if (scmnd) {
+                srp_free_req(target, req, scmnd, 0);
                 scmnd->result = DID_RESET << 16;
                 scmnd->scsi_done(scmnd);
-                srp_free_req(target, req, scmnd, 0);
         }
 }