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[86.195.82.193]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-43d63e50200sm34922778f8f.29.2026.04.13.10.42.40 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 13 Apr 2026 10:42:40 -0700 (PDT) From: f6bvp To: linux-hams@vger.kernel.org Cc: netdev@vger.kernel.org, edumazet@google.com, pabeni@redhat.com, f6bvp Subject: [PATCH net-next 2/3] rose: clear neighbour pointer after rose_neigh_put() in state machines Date: Mon, 13 Apr 2026 19:42:37 +0200 Message-ID: <20260413174238.112418-2-bernard.f6bvp@gmail.com> X-Mailer: git-send-email 2.51.0 In-Reply-To: <20260413174238.112418-1-bernard.f6bvp@gmail.com> References: <5a88b747-bb06-4ebd-99de-80ceb574cf22@free.fr> <20260413174238.112418-1-bernard.f6bvp@gmail.com> Precedence: bulk X-Mailing-List: linux-hams@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit After releasing a neighbour reference with rose_neigh_put() in the ROSE state machines, the pointer in rose_sock was left dangling. A subsequent code path could dereference the freed neighbour, causing a use-after-free. Set rose->neighbour to NULL immediately after each rose_neigh_put() call in rose_state1_machine() through rose_state5_machine(). Signed-off-by: f6bvp --- net/rose/rose_in.c | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/net/rose/rose_in.c b/net/rose/rose_in.c index 0276b393f0e5..622527f1354f 100644 --- a/net/rose/rose_in.c +++ b/net/rose/rose_in.c @@ -57,6 +57,7 @@ static int rose_state1_machine(struct sock *sk, struct sk_buff *skb, int framety rose_write_internal(sk, ROSE_CLEAR_CONFIRMATION); rose_disconnect(sk, ECONNREFUSED, skb->data[3], skb->data[4]); rose_neigh_put(rose->neighbour); + rose->neighbour = NULL; break; default: @@ -80,11 +81,13 @@ static int rose_state2_machine(struct sock *sk, struct sk_buff *skb, int framety rose_write_internal(sk, ROSE_CLEAR_CONFIRMATION); rose_disconnect(sk, 0, skb->data[3], skb->data[4]); rose_neigh_put(rose->neighbour); + rose->neighbour = NULL; break; case ROSE_CLEAR_CONFIRMATION: rose_disconnect(sk, 0, -1, -1); rose_neigh_put(rose->neighbour); + rose->neighbour = NULL; break; default: @@ -122,6 +125,7 @@ static int rose_state3_machine(struct sock *sk, struct sk_buff *skb, int framety rose_write_internal(sk, ROSE_CLEAR_CONFIRMATION); rose_disconnect(sk, 0, skb->data[3], skb->data[4]); rose_neigh_put(rose->neighbour); + rose->neighbour = NULL; break; case ROSE_RR: @@ -235,6 +239,7 @@ static int rose_state4_machine(struct sock *sk, struct sk_buff *skb, int framety rose_write_internal(sk, ROSE_CLEAR_CONFIRMATION); rose_disconnect(sk, 0, skb->data[3], skb->data[4]); rose_neigh_put(rose->neighbour); + rose->neighbour = NULL; break; default: @@ -255,6 +260,7 @@ static int rose_state5_machine(struct sock *sk, struct sk_buff *skb, int framety rose_write_internal(sk, ROSE_CLEAR_CONFIRMATION); rose_disconnect(sk, 0, skb->data[3], skb->data[4]); rose_neigh_put(rose_sk(sk)->neighbour); + rose_sk(sk)->neighbour = NULL; } return 0; -- 2.51.0