From patchwork Wed Aug 28 04:33:34 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Nicholas Piggin X-Patchwork-Id: 13780506 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 948F3C5472D for ; Wed, 28 Aug 2024 04:34:49 +0000 (UTC) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1sjANZ-0000Rv-Bs; Wed, 28 Aug 2024 00:33:57 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1sjANU-0000JM-6d for qemu-devel@nongnu.org; Wed, 28 Aug 2024 00:33:53 -0400 Received: from mail-pl1-x62d.google.com ([2607:f8b0:4864:20::62d]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_128_GCM_SHA256:128) (Exim 4.90_1) (envelope-from ) id 1sjANS-0002dM-Nk for qemu-devel@nongnu.org; Wed, 28 Aug 2024 00:33:51 -0400 Received: by mail-pl1-x62d.google.com with SMTP id d9443c01a7336-202089e57d8so1449805ad.0 for ; Tue, 27 Aug 2024 21:33:50 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20230601; t=1724819629; x=1725424429; darn=nongnu.org; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date :message-id:reply-to; bh=GmKSAgPdEuaidN129B+a5rF+PXzuWPo3dTfBM5ZgjWs=; b=kQt11aAOScD633YQwvKEhRWWGmXj65F9S7g3TMhgNjzdS1w6Lcvr//hhs/iyaA27lQ O/iosPwMcCQVW4OAlTubBpJArXJmyfMaBmt4hmOWJyWjQKWbkh8v55GyAsD2tPmCGljp 7qRL2qPi9XWf0HXx7ppS/7yWpy3mugpxr+U5MWB2uL8XmxiOeZ03hPJ9ugeQuadSjuud q8Oas05tTMuFAA8KBlKfwjD94nzK0wcCUmkCF084vg8J4Y1sJspMwuZWLISXk9ED35aA +dhBuRj3RVKGXlzE4E4QnOJ2b1PUNdSAuMsO22M/1qINFUr9GMUvhOBcuv4zPxzxy/3d wFqg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1724819629; x=1725424429; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=GmKSAgPdEuaidN129B+a5rF+PXzuWPo3dTfBM5ZgjWs=; b=RVIOwGI6W4lFZxW9j2FH8M/kiATygiHAUcAxcnlYTizbU7d302QRXr3oK0N1w+7t9i DZMVqp/vDxjjBccSV47cs7EPS3dsmCvs7XiY9rsSV54Z9Jtbi8acfX7I3I5NCEfunLPl jSq7fAsx5I8wGhoU+KEYgwKhoQH4aLJPBx+TDU09ht6SfZ4U7CfdeZxp3mkPTldierh1 dfKl++I1Vo4V/cFahAsDr3pOHKlR8GdaVqWudic5p4Mrh+9ccz7AmXzFCxV8phxfD6p2 +fdg46XwDBZxYRvhFsBDjLexw7VYtVpsWBtIE8CzqcoSNEXrZgo4v8p8JLdZtcxBqaOX Eihg== X-Forwarded-Encrypted: i=1; AJvYcCW7LF9SB01FGFeiyUv06Jo2fBuLd2eAI/g/Z0zDNlKcZru0mNWtxmAqKG8/Ad/NaRCmgbtkipUXT5VA@nongnu.org X-Gm-Message-State: AOJu0YwNzsJcml7sVlzzWsdyEf+Wb47XgAG19dnrPuykaI8P0h9H3cPP E1LpGKgGwwBAidf+kJrdmv0WEZ0klhIXomzg94JOuR88U0VEO/Le8wcHxg== X-Google-Smtp-Source: AGHT+IHQ0pMWGdx7R1XbhTeblGbSI5nEVdA5B7wefCynXbSADfKkbdv3jVHfz82jlKKiVYNmtui0Tg== X-Received: by 2002:a17:902:e542:b0:1fb:77e7:27b2 with SMTP id d9443c01a7336-204f9bd573bmr11133225ad.18.1724819629299; Tue, 27 Aug 2024 21:33:49 -0700 (PDT) Received: from wheely.local0.net ([1.146.81.12]) by smtp.gmail.com with ESMTPSA id d9443c01a7336-2038557f093sm90342325ad.63.2024.08.27.21.33.46 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 27 Aug 2024 21:33:49 -0700 (PDT) From: Nicholas Piggin To: Peter Maydell Cc: Nicholas Piggin , =?utf-8?q?Alex_Benn=C3=A9e?= , qemu-devel@nongnu.org Subject: [PATCH 1/2] chardev: Fix record/replay error path NULL deref in device creation Date: Wed, 28 Aug 2024 14:33:34 +1000 Message-ID: <20240828043337.14587-2-npiggin@gmail.com> X-Mailer: git-send-email 2.45.2 In-Reply-To: <20240828043337.14587-1-npiggin@gmail.com> References: <20240828043337.14587-1-npiggin@gmail.com> MIME-Version: 1.0 Received-SPF: pass client-ip=2607:f8b0:4864:20::62d; envelope-from=npiggin@gmail.com; helo=mail-pl1-x62d.google.com X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, FREEMAIL_FROM=0.001, RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, T_SCC_BODY_TEXT_LINE=-0.01 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org qemu_chardev_set_replay() was being called in chardev creation to set up replay parameters even if the chardev is NULL. A segfault can be reproduced by specifying '-serial chardev:bad' with an rr=record mode. Fix this with a NULL pointer check. Reported-by: Peter Maydell Resolves: Coverity CID 1559470 Fixes: 4c193bb129dae ("chardev: set record/replay on the base device of a muxed device") Signed-off-by: Nicholas Piggin Reviewed-by: Peter Maydell --- chardev/char.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/chardev/char.c b/chardev/char.c index ba847b6e9e..47a744ebeb 100644 --- a/chardev/char.c +++ b/chardev/char.c @@ -721,7 +721,7 @@ static Chardev *__qemu_chr_new(const char *label, const char *filename, if (strstart(filename, "chardev:", &p)) { chr = qemu_chr_find(p); - if (replay) { + if (replay && chr) { qemu_chardev_set_replay(chr, &err); if (err) { error_report_err(err);