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 4A95C146010; Thu, 11 Apr 2024 10:04:53 +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=1712829894; cv=none; b=ng2/GnjCCM9nw5PNIjyJU8DFp06KMvWPTZ/gwm/L4B7XWYtY0zFNp8SSudJG5dubUN5fq+LJfJqJeta42jw18gArXGCkbG30CbFxpl7xJY3MLdzf2+PV6mcngrevjEvskQHZYL/gNbdl76UrdICV8gd9MDBHnMKFJNX/D3oalL8= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1712829894; c=relaxed/simple; bh=QZCYQLdkDpsmmUS06EKe9Mw7sNRi6GxqTQ+Iq9HV3Z4=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=WtZUD3l3TvH9YcIFSvbhdlzqOqDKimju6P5YUuHYI2lAQm2PlXqWOw57EPateg+erk6xfzE8Ur33KFQHUqxeEXYaBpPrb7xNgnqI4QCLM3h/Z7iAmxx+VLn+OK37MSGhJEkmQnO5vkzHNHChOxOh3pwxBBv/j8mnUzTW1kU3ybQ= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=qThrIlcJ; 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="qThrIlcJ" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 5F253C433C7; Thu, 11 Apr 2024 10:04:53 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1712829893; bh=QZCYQLdkDpsmmUS06EKe9Mw7sNRi6GxqTQ+Iq9HV3Z4=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=qThrIlcJXwDtNLSlOZ+Wky6xNRejjZL+wXroro/loK19Br8Rs2orN8Fm6VeuDFxXN 7jdKs4GDa1e1pKApv4YLXmpaC5+ilj3byacAFO9DOirVbAxNtVrAzlROnN69EH5o7w Ymr/QSmmHqWCTmaqKyZPqeglEqevEih/KYvlQCKo= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Arnd Bergmann , Damien Le Moal , Sasha Levin Subject: [PATCH 4.19 141/175] ata: sata_sx4: fix pdc20621_get_from_dimm() on 64-bit Date: Thu, 11 Apr 2024 11:56:04 +0200 Message-ID: <20240411095423.809851979@linuxfoundation.org> X-Mailer: git-send-email 2.44.0 In-Reply-To: <20240411095419.532012976@linuxfoundation.org> References: <20240411095419.532012976@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: Arnd Bergmann [ Upstream commit 52f80bb181a9a1530ade30bc18991900bbb9697f ] gcc warns about a memcpy() with overlapping pointers because of an incorrect size calculation: In file included from include/linux/string.h:369, from drivers/ata/sata_sx4.c:66: In function 'memcpy_fromio', inlined from 'pdc20621_get_from_dimm.constprop' at drivers/ata/sata_sx4.c:962:2: include/linux/fortify-string.h:97:33: error: '__builtin_memcpy' accessing 4294934464 bytes at offsets 0 and [16, 16400] overlaps 6442385281 bytes at offset -2147450817 [-Werror=restrict] 97 | #define __underlying_memcpy __builtin_memcpy | ^ include/linux/fortify-string.h:620:9: note: in expansion of macro '__underlying_memcpy' 620 | __underlying_##op(p, q, __fortify_size); \ | ^~~~~~~~~~~~~ include/linux/fortify-string.h:665:26: note: in expansion of macro '__fortify_memcpy_chk' 665 | #define memcpy(p, q, s) __fortify_memcpy_chk(p, q, s, \ | ^~~~~~~~~~~~~~~~~~~~ include/asm-generic/io.h:1184:9: note: in expansion of macro 'memcpy' 1184 | memcpy(buffer, __io_virt(addr), size); | ^~~~~~ The problem here is the overflow of an unsigned 32-bit number to a negative that gets converted into a signed 'long', keeping a large positive number. Replace the complex calculation with a more readable min() variant that avoids the warning. Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2") Signed-off-by: Arnd Bergmann Signed-off-by: Damien Le Moal Signed-off-by: Sasha Levin --- drivers/ata/sata_sx4.c | 6 ++---- 1 file changed, 2 insertions(+), 4 deletions(-) diff --git a/drivers/ata/sata_sx4.c b/drivers/ata/sata_sx4.c index 0d742457925ec..f217ac8e17b15 100644 --- a/drivers/ata/sata_sx4.c +++ b/drivers/ata/sata_sx4.c @@ -1020,8 +1020,7 @@ static void pdc20621_get_from_dimm(struct ata_host *host, void *psource, offset -= (idx * window_size); idx++; - dist = ((long) (window_size - (offset + size))) >= 0 ? size : - (long) (window_size - offset); + dist = min(size, window_size - offset); memcpy_fromio(psource, dimm_mmio + offset / 4, dist); psource += dist; @@ -1069,8 +1068,7 @@ static void pdc20621_put_to_dimm(struct ata_host *host, void *psource, readl(mmio + PDC_DIMM_WINDOW_CTLR); offset -= (idx * window_size); idx++; - dist = ((long)(s32)(window_size - (offset + size))) >= 0 ? size : - (long) (window_size - offset); + dist = min(size, window_size - offset); memcpy_toio(dimm_mmio + offset / 4, psource, dist); writel(0x01, mmio + PDC_GENERAL_CTLR); readl(mmio + PDC_GENERAL_CTLR); -- 2.43.0