Patch "net: rds: Fix possible NULL-pointer dereference" has been added to the 5.15-stable tree

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This is a note to let you know that I've just added the patch titled

    net: rds: Fix possible NULL-pointer dereference

to the 5.15-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     net-rds-fix-possible-null-pointer-dereference.patch
and it can be found in the queue-5.15 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.



commit 931460e236e828d8eeb7fd4d4ec7b3cd46667442
Author: Artem Chernyshev <artem.chernyshev@xxxxxxxxxxx>
Date:   Mon Sep 18 16:56:23 2023 +0300

    net: rds: Fix possible NULL-pointer dereference
    
    [ Upstream commit f1d95df0f31048f1c59092648997686e3f7d9478 ]
    
    In rds_rdma_cm_event_handler_cmn() check, if conn pointer exists
    before dereferencing it as rdma_set_service_type() argument
    
    Found by Linux Verification Center (linuxtesting.org) with SVACE.
    
    Fixes: fd261ce6a30e ("rds: rdma: update rdma transport for tos")
    Signed-off-by: Artem Chernyshev <artem.chernyshev@xxxxxxxxxxx>
    Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
    Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>

diff --git a/net/rds/rdma_transport.c b/net/rds/rdma_transport.c
index a9e4ff948a7d6..f71f073fd27ac 100644
--- a/net/rds/rdma_transport.c
+++ b/net/rds/rdma_transport.c
@@ -86,11 +86,13 @@ static int rds_rdma_cm_event_handler_cmn(struct rdma_cm_id *cm_id,
 		break;
 
 	case RDMA_CM_EVENT_ADDR_RESOLVED:
-		rdma_set_service_type(cm_id, conn->c_tos);
-		rdma_set_min_rnr_timer(cm_id, IB_RNR_TIMER_000_32);
-		/* XXX do we need to clean up if this fails? */
-		ret = rdma_resolve_route(cm_id,
-					 RDS_RDMA_RESOLVE_TIMEOUT_MS);
+		if (conn) {
+			rdma_set_service_type(cm_id, conn->c_tos);
+			rdma_set_min_rnr_timer(cm_id, IB_RNR_TIMER_000_32);
+			/* XXX do we need to clean up if this fails? */
+			ret = rdma_resolve_route(cm_id,
+						 RDS_RDMA_RESOLVE_TIMEOUT_MS);
+		}
 		break;
 
 	case RDMA_CM_EVENT_ROUTE_RESOLVED:



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