From patchwork Tue Oct 1 13:26:59 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: David Howells X-Patchwork-Id: 13817978 X-Patchwork-Delegate: kuba@kernel.org Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.129.124]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 516251C6881 for ; Tue, 1 Oct 2024 13:27:23 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=170.10.129.124 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1727789244; cv=none; b=iRoFHLRdN4LDObFBW8e6OM/8oRU9HdIMshxm4t6Bs+JS49gd/sAPS0jhj559VHeqDcS9K8oJFGnCUPH1UgAPwBS70gRz6+pIqtHMe64/Of5TwQpEz8c50XlB9QX7HB+/fF3u9e8h7zklB2+KaaLE32BCf5LLd+luh+o5q9kaf2I= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1727789244; c=relaxed/simple; bh=JNzAp1yMKbV8lpc6uCr8lJxmSscW4K2GTVrGuzAx3SQ=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=ZJE1dAEKC/YL1lzFR3iGd8cOoCyhC7pvYywcU8MiO2xdzbh6yWVlRxc1VNSPPc/xPtRfT9i3ZQkjD8WJDJnQ+RERCQyNHlnX+RKON+fKaSP+GV4j+oqj3pnaKXS/mB7WIpnU1P05dHlij8dreLlSCbJLx+O600jVXWsX8sZTRYc= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=redhat.com; spf=pass smtp.mailfrom=redhat.com; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b=EjsHcyVd; arc=none smtp.client-ip=170.10.129.124 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=redhat.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=redhat.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b="EjsHcyVd" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1727789242; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=+K/uFnjY9rI4dQD1VXRi5j3BHKaMNfn7A9yy5gGESz4=; b=EjsHcyVdtlRQaIAKDLOuU14dsDJyN0lRVkJbUXGwpvzN7OF8/PhHs/rj8K7JKHjg9sUqwD cfK6ZzmXp1CO6rSRx3lLK9mToofG6fajp/8GGy4IM0JD3Uh6XlC/KnBoFXya+BlWnnE22w 5j9gkPhHVEHiA9tlFc54G/vaYgvW2SA= Received: from mx-prod-mc-01.mail-002.prod.us-west-2.aws.redhat.com (ec2-54-186-198-63.us-west-2.compute.amazonaws.com [54.186.198.63]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.3, cipher=TLS_AES_256_GCM_SHA384) id us-mta-619-aMLXcemqPdW0D3y3Ac5Upg-1; Tue, 01 Oct 2024 09:27:17 -0400 X-MC-Unique: aMLXcemqPdW0D3y3Ac5Upg-1 Received: from mx-prod-int-01.mail-002.prod.us-west-2.aws.redhat.com (unknown [10.30.177.4]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by mx-prod-mc-01.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTPS id 214941943CDC; Tue, 1 Oct 2024 13:27:16 +0000 (UTC) Received: from warthog.procyon.org.uk.com (unknown [10.42.28.145]) by mx-prod-int-01.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTP id 1AD113003DEC; Tue, 1 Oct 2024 13:27:12 +0000 (UTC) From: David Howells To: netdev@vger.kernel.org Cc: David Howells , Marc Dionne , "David S. Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , linux-afs@lists.infradead.org, linux-kernel@vger.kernel.org, Dan Carpenter Subject: [PATCH net 2/2] rxrpc: Fix uninitialised variable in rxrpc_send_data() Date: Tue, 1 Oct 2024 14:26:59 +0100 Message-ID: <20241001132702.3122709-3-dhowells@redhat.com> In-Reply-To: <20241001132702.3122709-1-dhowells@redhat.com> References: <20241001132702.3122709-1-dhowells@redhat.com> Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Scanned-By: MIMEDefang 3.4.1 on 10.30.177.4 X-Patchwork-Delegate: kuba@kernel.org Fix the uninitialised txb variable in rxrpc_send_data() by moving the code that loads it above all the jumps to maybe_error, txb being stored back into call->tx_pending right before the normal return. Fixes: b0f571ecd794 ("rxrpc: Fix locking in rxrpc's sendmsg") Reported-by: Dan Carpenter Closes: https://lists.infradead.org/pipermail/linux-afs/2024-October/008896.html Signed-off-by: David Howells cc: Marc Dionne cc: "David S. Miller" cc: Eric Dumazet cc: Jakub Kicinski cc: Paolo Abeni cc: linux-afs@lists.infradead.org cc: netdev@vger.kernel.org --- net/rxrpc/sendmsg.c | 10 +++++----- 1 file changed, 5 insertions(+), 5 deletions(-) diff --git a/net/rxrpc/sendmsg.c b/net/rxrpc/sendmsg.c index 894b8fa68e5e..23d18fe5de9f 100644 --- a/net/rxrpc/sendmsg.c +++ b/net/rxrpc/sendmsg.c @@ -303,6 +303,11 @@ static int rxrpc_send_data(struct rxrpc_sock *rx, sk_clear_bit(SOCKWQ_ASYNC_NOSPACE, sk); reload: + txb = call->tx_pending; + call->tx_pending = NULL; + if (txb) + rxrpc_see_txbuf(txb, rxrpc_txbuf_see_send_more); + ret = -EPIPE; if (sk->sk_shutdown & SEND_SHUTDOWN) goto maybe_error; @@ -329,11 +334,6 @@ static int rxrpc_send_data(struct rxrpc_sock *rx, goto maybe_error; } - txb = call->tx_pending; - call->tx_pending = NULL; - if (txb) - rxrpc_see_txbuf(txb, rxrpc_txbuf_see_send_more); - do { if (!txb) { size_t remain;