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Miller" , Eric Dumazet , Paolo Abeni , Simon Horman , linux-afs@lists.infradead.org, linux-kernel@vger.kernel.org, Jeffrey Altman , stable@kernel.org Subject: [PATCH net 1/4] afs: Fix NULL deref in afs_deliver_cb_init_call_back_state3() Date: Thu, 2 Jul 2026 15:49:15 +0100 Message-ID: <20260702144919.172295-2-dhowells@redhat.com> In-Reply-To: <20260702144919.172295-1-dhowells@redhat.com> References: <20260702144919.172295-1-dhowells@redhat.com> Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Scanned-By: MIMEDefang 3.4.1 on 10.30.177.4 Fix afs_deliver_cb_init_call_back_state3() to avoid a potential NULL deref should call->server be NULL (ie. afs_rx_new_call() failed to find a matching server record) when it checks the server's UUID. Fixes: 40e8b52fe8c8 ("afs: Use the per-peer app data provided by rxrpc") Link: https://sashiko.dev/#/patchset/20260624163819.3017002-1-dhowells%40redhat.com Signed-off-by: David Howells cc: Marc Dionne cc: Jeffrey Altman cc: Eric Dumazet cc: "David S. Miller" cc: Jakub Kicinski cc: Paolo Abeni cc: Simon Horman cc: linux-afs@lists.infradead.org cc: stable@kernel.org --- fs/afs/cmservice.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/fs/afs/cmservice.c b/fs/afs/cmservice.c index 5540ae1cad59..d579a665e3da 100644 --- a/fs/afs/cmservice.c +++ b/fs/afs/cmservice.c @@ -364,7 +364,8 @@ static int afs_deliver_cb_init_call_back_state3(struct afs_call *call) if (!afs_check_call_state(call, AFS_CALL_SV_REPLYING)) return afs_io_error(call, afs_io_error_cm_reply); - if (memcmp(call->request, &call->server->_uuid, sizeof(call->server->_uuid)) != 0) { + if (call->server && + memcmp(call->request, &call->server->_uuid, sizeof(call->server->_uuid)) != 0) { pr_notice("Callback UUID does not match fileserver UUID\n"); trace_afs_cm_no_server_u(call, call->request); return 0;