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 187551F891F; Tue, 3 Dec 2024 15:36:34 +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=1733240196; cv=none; b=XZtH1XixZBVPClU2eg9snhVomCVSS8yVAeN2f57rw1LQtywGXoFda9QpoRoSl4kPHyJVsfeL+lNMCDY7KhGD7EJNsW2yYjb58xxsQ9stzdGEtWGRXSSjg945GTtX0lOUhvlbEJROskYi1s53Taw+0shRoeJSu08Qnw4PUr466Ms= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1733240196; c=relaxed/simple; bh=Zgd59LIQ4J9o5XiLVxXozX1C6Agq92YO2sblrR6dggM=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=YnbmJ0u226Ra8WiH8YexcWj3abufZDMIvAeOfq0mGIwC9xRbJz2xoSQlGXboZ5I+Lo677mhsYtApnork1G+Ow8uKZ9OUk4rMihTXzUI0dHie+3k0DRHanOSj3K5URlJQlLm6/UCm9pKe+qKg/6W1464jIevWWWJfCNiFBuneg64= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=g2352dpe; 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="g2352dpe" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 52940C4CECF; Tue, 3 Dec 2024 15:36:34 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1733240194; bh=Zgd59LIQ4J9o5XiLVxXozX1C6Agq92YO2sblrR6dggM=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=g2352dpePypAddi/IZXpjH1FqLTF9Xu/mUsFNh/FBH6ubVN53zpOTfIz9An0/Ra/R CBNfPsZcrFaq7cBGImwNW+mYcV1y5Gj5MgZZ5NIb1r20Ub4xv2IcqdsP+RzjaLzwOE xn3lJi9JdBFF/O8MLgihoj0VYVX/kqj6OnwkC85k= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Priyanka Singh , Li Yang , Frank Li , "Borislav Petkov (AMD)" , Sasha Levin Subject: [PATCH 6.12 055/826] EDAC/fsl_ddr: Fix bad bit shift operations Date: Tue, 3 Dec 2024 15:36:22 +0100 Message-ID: <20241203144745.621406576@linuxfoundation.org> X-Mailer: git-send-email 2.47.1 In-Reply-To: <20241203144743.428732212@linuxfoundation.org> References: <20241203144743.428732212@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 6.12-stable review patch. If anyone has any objections, please let me know. ------------------ From: Priyanka Singh [ Upstream commit 9ec22ac4fe766c6abba845290d5139a3fbe0153b ] Fix undefined behavior caused by left-shifting a negative value in the expression: cap_high ^ (1 << (bad_data_bit - 32)) The variable bad_data_bit ranges from 0 to 63. When it is less than 32, bad_data_bit - 32 becomes negative, and left-shifting by a negative value in C is undefined behavior. Fix this by combining cap_high and cap_low into a 64-bit variable. [ bp: Massage commit message, simplify error bits handling. ] Fixes: ea2eb9a8b620 ("EDAC, fsl-ddr: Separate FSL DDR driver from MPC85xx") Signed-off-by: Priyanka Singh Signed-off-by: Li Yang Signed-off-by: Frank Li Signed-off-by: Borislav Petkov (AMD) Link: https://lore.kernel.org/r/20241016-imx95_edac-v3-3-86ae6fc2756a@nxp.com Signed-off-by: Sasha Levin --- drivers/edac/fsl_ddr_edac.c | 22 +++++++++++++--------- 1 file changed, 13 insertions(+), 9 deletions(-) diff --git a/drivers/edac/fsl_ddr_edac.c b/drivers/edac/fsl_ddr_edac.c index d148d262d0d4d..339d94b3d04c7 100644 --- a/drivers/edac/fsl_ddr_edac.c +++ b/drivers/edac/fsl_ddr_edac.c @@ -328,21 +328,25 @@ static void fsl_mc_check(struct mem_ctl_info *mci) * TODO: Add support for 32-bit wide buses */ if ((err_detect & DDR_EDE_SBE) && (bus_width == 64)) { + u64 cap = (u64)cap_high << 32 | cap_low; + u32 s = syndrome; + sbe_ecc_decode(cap_high, cap_low, syndrome, &bad_data_bit, &bad_ecc_bit); - if (bad_data_bit != -1) - fsl_mc_printk(mci, KERN_ERR, - "Faulty Data bit: %d\n", bad_data_bit); - if (bad_ecc_bit != -1) - fsl_mc_printk(mci, KERN_ERR, - "Faulty ECC bit: %d\n", bad_ecc_bit); + if (bad_data_bit >= 0) { + fsl_mc_printk(mci, KERN_ERR, "Faulty Data bit: %d\n", bad_data_bit); + cap ^= 1ULL << bad_data_bit; + } + + if (bad_ecc_bit >= 0) { + fsl_mc_printk(mci, KERN_ERR, "Faulty ECC bit: %d\n", bad_ecc_bit); + s ^= 1 << bad_ecc_bit; + } fsl_mc_printk(mci, KERN_ERR, "Expected Data / ECC:\t%#8.8x_%08x / %#2.2x\n", - cap_high ^ (1 << (bad_data_bit - 32)), - cap_low ^ (1 << bad_data_bit), - syndrome ^ (1 << bad_ecc_bit)); + upper_32_bits(cap), lower_32_bits(cap), s); } fsl_mc_printk(mci, KERN_ERR, -- 2.43.0