[Devel] [PATCH RHEL10 COMMIT] ms/rxrpc: Fix rxrpc_input_call_event() to only unshare DATA packets

[Konstantin Khorenko]

The commit is pushed to "branch-rh10-6.12.0-211.16.1.12.x.vz10-ovz" and will appear at git at bitbucket.org:openvz/vzkernel.git
after rh10-6.12.0-211.16.1.12.2.vz10
------>
commit e86e6a290c6b2c7bf711604b1399ce3e42aa0fc3
Author: David Howells <dhowells at redhat.com>
Date:   Thu Apr 23 21:09:06 2026 +0100

    ms/rxrpc: Fix rxrpc_input_call_event() to only unshare DATA packets
    
    Fix rxrpc_input_call_event() to only unshare DATA packets and not ACK,
    ABORT, etc..
    
    And with that, rxrpc_input_packet() doesn't need to take a pointer to the
    pointer to the packet, so change that to just a pointer.
    
    Fixes: 1f2740150f90 ("rxrpc: Fix potential UAF after skb_unshare() failure")
    Closes: https://sashiko.dev/#/patchset/20260422161438.2593376-4-dhowells@redhat.com
    Signed-off-by: David Howells <dhowells at redhat.com>
    cc: Marc Dionne <marc.dionne at auristor.com>
    cc: Jeffrey Altman <jaltman at auristor.com>
    cc: Simon Horman <horms at kernel.org>
    cc: linux-afs at lists.infradead.org
    cc: stable at kernel.org
    Link: https://patch.msgid.link/20260423200909.3049438-2-dhowells@redhat.com
    Signed-off-by: Jakub Kicinski <kuba at kernel.org>
    (cherry picked from commit 55b2984c96c37f909bbfe8851f13152693951382)
    
    Follow-up fix for the backported 1f2740150f90 ("rxrpc: Fix potential UAF
    after skb_unshare() failure"). Cherry-pick applied cleanly, no conflicts.
    
    https://virtuozzo.atlassian.net/browse/VSTOR-131094
    Feature: fix ms/rxrpc
    Signed-off-by: Konstantin Khorenko <khorenko at virtuozzo.com>
---
 net/rxrpc/call_event.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/net/rxrpc/call_event.c b/net/rxrpc/call_event.c
index cc8f9dfa44e8a..fdd683261226c 100644
--- a/net/rxrpc/call_event.c
+++ b/net/rxrpc/call_event.c
@@ -332,7 +332,8 @@ bool rxrpc_input_call_event(struct rxrpc_call *call)
 
 			saw_ack |= sp->hdr.type == RXRPC_PACKET_TYPE_ACK;
 
-			if (sp->hdr.securityIndex != 0 &&
+			if (sp->hdr.type == RXRPC_PACKET_TYPE_DATA &&
+			    sp->hdr.securityIndex != 0 &&
 			    skb_cloned(skb)) {
 				/* Unshare the packet so that it can be
 				 * modified by in-place decryption.