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 9EEBA2EF2A6; Tue, 17 Jun 2025 16:33:33 +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=1750178013; cv=none; b=ep6hGrAtenAqEaO9tCOaHFZjNwEnKDP9YkaJA2Q45j/3D7TqXKCgHhS/5zbK9Evbp3BuslbwYoJxoc02yUT5YlbknvurJ47epcT9zM3w3RD1fjN4/sipUKDJ1aO2fPDRwGuy3/Yup+edfufcIu7aL7mrHF8TbyYnQDihjnZGK4A= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1750178013; c=relaxed/simple; bh=kMZrI2rrYOqig9Wr9WnaAd1II4GcVx0LZuqJH5FzwGg=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=BaOoLT2NpsmxNxGDkaPolufo2mQx5HJHWSIQ9GuNvizmcqOQAr3KgI9NFJZgt+Tbi8MGzMoHLOJJ+ure7IVtMGhFUBOwg6YeinTZXlU4eephcAE2PA/4nmXnXmLDp6THvSs/jhajD8DHb7atpk1ePMMXwk+H2PmasUNTOpQxLcQ= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=cQ0BcqvP; 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="cQ0BcqvP" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 118C3C4CEE7; Tue, 17 Jun 2025 16:33:32 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1750178013; bh=kMZrI2rrYOqig9Wr9WnaAd1II4GcVx0LZuqJH5FzwGg=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=cQ0BcqvPIjz7SlSpWiea7k0KpJ4ujP1+HtvZ+dw85HJZMWjU9lX+MMFDaw3ah8i8h +YuSaAkOQ02lEXuV8twXtwry3ELkQ7PIRLBbjtMveiNJLmv4PqzIbNFWsIFdRnLPJn HMeWflT1kpWCBMpRs9/XUho2OcZU/iE7r9I+rr/M= 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 6.15 396/780] bus: fsl-mc: fix double-free on mc_dev Date: Tue, 17 Jun 2025 17:21:44 +0200 Message-ID: <20250617152507.580471711@linuxfoundation.org> X-Mailer: git-send-email 2.49.0 In-Reply-To: <20250617152451.485330293@linuxfoundation.org> References: <20250617152451.485330293@linuxfoundation.org> User-Agent: quilt/0.68 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: patches@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 6.15-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 a8be8cf246fb6..0c3a38d7f3358 100644 --- a/drivers/bus/fsl-mc/fsl-mc-bus.c +++ b/drivers/bus/fsl-mc/fsl-mc-bus.c @@ -906,8 +906,10 @@ 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