From mboxrd@z Thu Jan 1 00:00:00 1970 Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.remote-ip=100.103.45.18 ARC-Seal: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; cv=none; t=1794063579; b=zwu3nRithdJsFhfazoVWFoJLwXagsR2JXe1TN6sCtyPGZZjEZrfl3IagFP8L+5+J4PRp /5m/hRfFuhzFQGwH3bMdrNppoSP/ld5d7WbtafUkfPOFn8MQUpyQs9ti2UepBmFUxoHqk HIB9j6x+T/BZM9BWQrKIXQ4NCRaqzDH/NejvQwwJlN+k6gM/XNYputdSa/4XjPxMEsb/k 4V7OK3a1nnWO5N0mUlTwpzElTYUMVmmqhJIl7b8ATK65ZYOs9Oy7W/wkwiZrFpgNV57xc ST9n6VEszbRlkXKrsv/T5mwYRsdlEAFr+9/mNzqF2MEEnW6wFnEXuAKkJ6YF5iM2gwg== ARC-Message-Signature: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; c=relaxed/relaxed; t=1794063579; h=Received:DKIM-Signature:From:To:Cc:Subject:Date:Message-ID:X-Mailer: In-Reply-To:References:User-Agent:X-stable:X-Patchwork-Hint: MIME-Version:Content-Transfer-Encoding; bh=xw9ZwWMa7Xc6YF8mkhgGTxt1trJH/F59+BRdqNrYnoQ=; b=iNsn1MQ6Wo7gr4/wEA0CJWDg8fDTvWMhMFVyfDWFgcpWkJmgsGHlJ95Uxhfr/BHk4FGO VpNhF4VVY9wNqUfzexfkmf6LtC+zL7q3SfaA+ByHl+RMfH54sPfKWlgRJ4p3zNqSoKmpR OUkZQT03BXnXAHa3A8HJXC7SWN47nE/r1FR53FXzAkqkRQMNrZrd94akUh9hKAsOsmYOe K01lJBjVVx3CSQVlvbAeNcu+weYykAgGKJhTlRCgShOjmms4Z8BQ95Mwf/6kdJ7qQ0IS9 57Pa+TAcvdXOwabsqujwwh6NE/RFWknLgEMqvhlNOGDlSibKHEikZlAnUE3yy2+fstQ== ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass header.d=linuxfoundation.org header.i=@linuxfoundation.org header.a=rsa-sha256 header.s=korg header.b=jHOi0hXF; arc=none smtp.remote-ip=100.103.45.18 Received: from smtp.kernel.org (quasi.space.kernel.org [100.103.45.18]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature ECDSA (prime256v1)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 22C3460A2634; Sat, 7 Nov 2026 14:59:39 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.a=rsa-sha256 header.s=korg header.b=jHOi0hXF Received: by smtp.kernel.org (Postfix) with ESMTPSA id C42B01F008A2; Sat, 7 Nov 2026 14:59:38 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1794063579; bh=xw9ZwWMa7Xc6YF8mkhgGTxt1trJH/F59+BRdqNrYnoQ=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=jHOi0hXFfFxI7cdRqNd6XVSi3dyiORrr7tqLTGOhyNRp5Nb0uRmZ1zp2JpDr/4BhX b8hWbqODa70/d0fGCUcEiA8665TDir4gqmWagd/nw8HAkpn0L0g5X7MGn7we5Xmw6E KovBxep6SX3tZjzVQkL5/JUFaOc8siNHD6LW6a+Q= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Fang Xieyan , Liu Chao , Loic Poulain , Jakub Kicinski , Sasha Levin Subject: [PATCH 6.18 708/869] net: wwan: iosm: validate msg_head before indexing msg_ring Date: Sat, 7 Nov 2026 08:56:30 -0500 Message-ID: <20261107134916.906186252@linuxfoundation.org> X-Mailer: git-send-email 2.56.0 In-Reply-To: <20261107134852.069646174@linuxfoundation.org> References: <20261107134852.069646174@linuxfoundation.org> User-Agent: quilt/0.69 X-stable: review X-Patchwork-Hint: ignore X-Mailing-List: stable@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 6.18-stable review patch. If anyone has any objections, please let me know. ------------------ From: Liu Chao [ Upstream commit 46cbf85155e5451b6682ea0c17bc62ec564aec36 ] ipc_protocol_free_msg_get() reads msg_head from shared memory and uses it directly as an index into msg_ring[]. If the head is out of range, the subsequent memset() writes beyond the message ring. Validate head against IPC_MEM_MSG_ENTRIES before using it as an index. The ring is a circular buffer, so a value outside the valid range indicates a corrupted head pointer; report the error and fail the allocation instead of writing out of bounds. Fixes: 64516f633bfd ("net: iosm: protocol operations") Cc: stable@vger.kernel.org Reviewed-by: Fang Xieyan Signed-off-by: Liu Chao Reviewed-by: Loic Poulain Link: https://patch.msgid.link/20261020094254.4017726-1-liuc63@xiaopeng.com Signed-off-by: Jakub Kicinski Signed-off-by: Sasha Levin --- drivers/net/wwan/iosm/iosm_ipc_protocol_ops.c | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/drivers/net/wwan/iosm/iosm_ipc_protocol_ops.c b/drivers/net/wwan/iosm/iosm_ipc_protocol_ops.c index 4627847c6daab..455b3b6f09917 100644 --- a/drivers/net/wwan/iosm/iosm_ipc_protocol_ops.c +++ b/drivers/net/wwan/iosm/iosm_ipc_protocol_ops.c @@ -14,6 +14,11 @@ ipc_protocol_free_msg_get(struct iosm_protocol *ipc_protocol, int *index) u32 new_head = (head + 1) % IPC_MEM_MSG_ENTRIES; union ipc_mem_msg_entry *msg; + if (head >= IPC_MEM_MSG_ENTRIES) { + dev_err(ipc_protocol->dev, "invalid message head %u", head); + return NULL; + } + if (new_head == le32_to_cpu(ipc_protocol->p_ap_shm->msg_tail)) { dev_err(ipc_protocol->dev, "message ring is full"); return NULL; -- 2.53.0