From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (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 E6D202F234D; Tue, 17 Jun 2025 15:51:54 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1750175515; cv=none; b=qBp822lfJkKHfm81yVl6nrdSOAuk5/0ttVhkE0OU8o780ExrLssikc18NF0BRHH0gdzyFx8VrfizyuG0jNR4UyZj6xauSJ+3O+1l5Wzq9p20vYGvMv5KkFdNnnp3yb1256RcKmUrCeQOIocyTW3Q2x9XJ3qy38PykSvZUuyfdR8= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1750175515; c=relaxed/simple; bh=1ShX5+I8vPBaMrrshbGCwWZmBUdIqMDj2PVCjndIHvg=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=KsVYy2dYN8yffmhUwBJ3kLqaukEa1Ck3At6LzhxqBxAopCI1jcPXZ/Y/yMx1LjJW9YWrARQYWWNpLMqR9X3rq0narVskE5tOVJ9cd7w4dURRGZWJRsHGklN5GLK+CneKee0g7/Bavfh25WV/m1n1jQfzOaCibFz7QiXYP5Ta8zU= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=EZtXMEWa; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="EZtXMEWa" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 635DFC4CEE3; Tue, 17 Jun 2025 15:51:54 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1750175514; bh=1ShX5+I8vPBaMrrshbGCwWZmBUdIqMDj2PVCjndIHvg=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=EZtXMEWaLVkknQLy9P/cCC5ze5cgHV4iZc8rsYY3ezdF/kTmzz1dZPwE7MPqF0V7c C/WIG4FQiG+ZPTF0+I9jVjQLD33TMN3+oFpBvdJdZKLzRj3oedyNSAxXt2peWv95Y3 o4J5t1OPyjAtV8/OrTCLKjR5xgXD9OwWyULgSrFU= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Ioana Ciornei , Christophe Leroy , Sasha Levin Subject: [PATCH 6.6 184/356] bus: fsl-mc: fix double-free on mc_dev Date: Tue, 17 Jun 2025 17:24:59 +0200 Message-ID: <20250617152345.623984938@linuxfoundation.org> X-Mailer: git-send-email 2.49.0 In-Reply-To: <20250617152338.212798615@linuxfoundation.org> References: <20250617152338.212798615@linuxfoundation.org> User-Agent: quilt/0.68 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: stable@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 6.6-stable review patch. If anyone has any objections, please let me know. ------------------ From: Ioana Ciornei [ Upstream commit d694bf8a9acdbd061596f3e7549bc8cb70750a60 ] The blamed commit tried to simplify how the deallocations are done but, in the process, introduced a double-free on the mc_dev variable. In case the MC device is a DPRC, a new mc_bus is allocated and the mc_dev variable is just a reference to one of its fields. In this circumstance, on the error path only the mc_bus should be freed. This commit introduces back the following checkpatch warning which is a false-positive. WARNING: kfree(NULL) is safe and this check is probably not required + if (mc_bus) + kfree(mc_bus); Fixes: a042fbed0290 ("staging: fsl-mc: simplify couple of deallocations") Signed-off-by: Ioana Ciornei Link: https://lore.kernel.org/r/20250408105814.2837951-2-ioana.ciornei@nxp.com Signed-off-by: Christophe Leroy Signed-off-by: Sasha Levin --- drivers/bus/fsl-mc/fsl-mc-bus.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-) diff --git a/drivers/bus/fsl-mc/fsl-mc-bus.c b/drivers/bus/fsl-mc/fsl-mc-bus.c index 2f6d5002e43d5..b405ee330af1f 100644 --- a/drivers/bus/fsl-mc/fsl-mc-bus.c +++ b/drivers/bus/fsl-mc/fsl-mc-bus.c @@ -905,8 +905,10 @@ int fsl_mc_device_add(struct fsl_mc_obj_desc *obj_desc, error_cleanup_dev: kfree(mc_dev->regions); - kfree(mc_bus); - kfree(mc_dev); + if (mc_bus) + kfree(mc_bus); + else + kfree(mc_dev); return error; } -- 2.39.5