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 2ADCA1DDF5; Thu, 15 Aug 2024 13:29:27 +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=1723728567; cv=none; b=lqccuzri7jp2o7Hdx4TueqWDa/dMTNbIOSdDcx225R4EInK0Cj+6i5Zum7tfqgrCCuFtfZNw/GnXqtKNUumarzGdeb/zwZEs7xxS+5d+eTAn2/iR1BTPvGUgrHSexjAji3YNdj0iuAgxMnQwzNr8vEbfPuOlYLaC09vIisaYbdA= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1723728567; c=relaxed/simple; bh=gGpEhuRbO6N96CwyDd2gKJkF4snEfuKMsBTA8aiRsAM=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=oWy3gr/EcA/dxf2NWIB1kHp3rXd8T6wgyXjew6jgn0LTgpbekErI4Ckel4ZYIRfSj0BXjqvDFwM8jKCbrnISMWFlfmQuJn00aUbcXbUs/tRsDY7kaY3u6zdJHHoVovdySORPtMH6rEwnem/Ohe4Ex5EbtsrQXyBvmrD3fIWklgA= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=pztO7ieY; 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="pztO7ieY" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 9CE19C4AF0C; Thu, 15 Aug 2024 13:29:26 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1723728567; bh=gGpEhuRbO6N96CwyDd2gKJkF4snEfuKMsBTA8aiRsAM=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=pztO7ieYaUkkCpEwo5r3SLbIjHneabBXc4CKS9wB0S9XJk4ri0XInFZK5DgFCxiWJ qMpnPOCZBDZfeE/RcfZpH/qChWN25fxAzidyiLTraSS9eBv658Whkn6G4WkdY0J+CW ihIDzc7+ujO198suaYCLw5Mw7gdz2zM5v8Lg5JSY= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Kees Cook , Javier Carrasco , Lee Jones , Sasha Levin Subject: [PATCH 4.19 039/196] mfd: omap-usb-tll: Use struct_size to allocate tll Date: Thu, 15 Aug 2024 15:22:36 +0200 Message-ID: <20240815131853.581611467@linuxfoundation.org> X-Mailer: git-send-email 2.46.0 In-Reply-To: <20240815131852.063866671@linuxfoundation.org> References: <20240815131852.063866671@linuxfoundation.org> User-Agent: quilt/0.67 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 4.19-stable review patch. If anyone has any objections, please let me know. ------------------ From: Javier Carrasco [ Upstream commit 40176714c818b0b6a2ca8213cdb7654fbd49b742 ] Commit 16c2004d9e4d ("mfd: omap-usb-tll: Allocate driver data at once") changed the memory allocation of 'tll' to consolidate it into a single allocation, introducing an incorrect size calculation. In particular, the allocation for the array of pointers was converted into a single-pointer allocation. The memory allocation used to occur in two steps: tll = devm_kzalloc(dev, sizeof(struct usbtll_omap), GFP_KERNEL); tll->ch_clk = devm_kzalloc(dev, sizeof(struct clk *) * tll->nch, GFP_KERNEL); And it turned that into the following allocation: tll = devm_kzalloc(dev, sizeof(*tll) + sizeof(tll->ch_clk[nch]), GFP_KERNEL); sizeof(tll->ch_clk[nch]) returns the size of a single pointer instead of the expected nch pointers. This bug went unnoticed because the allocation size was small enough to fit within the minimum size of a memory allocation for this particular case [1]. The complete allocation can still be done at once with the struct_size macro, which comes in handy for structures with a trailing flexible array. Fix the memory allocation to obtain the original size again. Link: https://lore.kernel.org/all/202406261121.2FFD65647@keescook/ [1] Fixes: 16c2004d9e4d ("mfd: omap-usb-tll: Allocate driver data at once") Reviewed-by: Kees Cook Signed-off-by: Javier Carrasco Fixes: commit 16c2004d9e4d ("mfd: omap-usb-tll: Allocate driver data at once") Link: https://lore.kernel.org/r/20240626-omap-usb-tll-counted_by-v2-1-4bedf20d1b51@gmail.com Signed-off-by: Lee Jones Signed-off-by: Sasha Levin --- drivers/mfd/omap-usb-tll.c | 3 +-- 1 file changed, 1 insertion(+), 2 deletions(-) diff --git a/drivers/mfd/omap-usb-tll.c b/drivers/mfd/omap-usb-tll.c index 446713dbee27a..269eeccb963bc 100644 --- a/drivers/mfd/omap-usb-tll.c +++ b/drivers/mfd/omap-usb-tll.c @@ -246,8 +246,7 @@ static int usbtll_omap_probe(struct platform_device *pdev) break; } - tll = devm_kzalloc(dev, sizeof(*tll) + sizeof(tll->ch_clk[nch]), - GFP_KERNEL); + tll = devm_kzalloc(dev, struct_size(tll, ch_clk, nch), GFP_KERNEL); if (!tll) { pm_runtime_put_sync(dev); pm_runtime_disable(dev); -- 2.43.0