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 E9788195986; Wed, 5 Jun 2024 11:52:39 +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=1717588360; cv=none; b=r0dufVSf95W2Wh1sHEXruzdX2gYyTMwAiYmxjzYgm7LGvDWA0V87cgRh8iTq2lfWF/Le4FFlOvTIjU6rE2If27Mix+I7ii79y+nA2sDFdG/+pmF4JvXMgMc0X0j3ayTJP5pfJjoZoWBQkGdsBYisEUlsqrItWIIuVjb64Muu/Do= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1717588360; c=relaxed/simple; bh=klJFbPZVKDRnhHyoOzh54fT6kOqFxXYc3De6rLdD1aE=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=XYQFU7Ngk9gU9PKJ0PDn9qKlrAYn1pL59fqZPzcFjpL1tX5hEsHaMkjzoVDE6yWNmqf0r8z7/JfRo9xpyuMn0Vz/iPJU+6T4jObz4HHe511O6yY4Jw5akfNE2EW6udwZChscYwWv8tOZJkcAhHFY+DqrNSLbdHZ0Fx2wNvL3DZc= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=ncQVyjkl; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="ncQVyjkl" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 9D9FDC32781; Wed, 5 Jun 2024 11:52:38 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1717588359; bh=klJFbPZVKDRnhHyoOzh54fT6kOqFxXYc3De6rLdD1aE=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=ncQVyjkldIaneWiwEvPC2+7Zra8N+4tnNodxI/rL2q1S3pEh0Yrbd1ENzvT1KqJ2w YqNyGFcShqG4bHuzyP+C1eEPix9/XaT+F/MgZM2xyel33arYAdxUeON4ZLWaaHUIZ9 dslnsXMu91lSU5rDcAgVZsC4CUTF0Yf7514/WYguoUpBSnS0GBYJFFoQUZiV9bdHit 3uNGpy6TkpqYXENRR6LJye8NwSmRxwPMMXfViMk0KQvtA6oPQBn1sw5oixMU1c4BNi LPrfA2p+eTGA8GePIDSjNVKZHGcDiKEXdY7Em/lkj6TZ47dF9OwDau75NiSgw+U1hK q4u26vHm4qAXA== From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Roman Smirnov , Jan Kara , Sergey Shtylyov , Sasha Levin , jack@suse.com Subject: [PATCH AUTOSEL 6.6 07/20] udf: udftime: prevent overflow in udf_disk_stamp_to_time() Date: Wed, 5 Jun 2024 07:51:50 -0400 Message-ID: <20240605115225.2963242-7-sashal@kernel.org> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20240605115225.2963242-1-sashal@kernel.org> References: <20240605115225.2963242-1-sashal@kernel.org> Precedence: bulk X-Mailing-List: stable@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore X-stable-base: Linux 6.6.32 Content-Transfer-Encoding: 8bit From: Roman Smirnov [ Upstream commit 3b84adf460381169c085e4bc09e7b57e9e16db0a ] An overflow can occur in a situation where src.centiseconds takes the value of 255. This situation is unlikely, but there is no validation check anywere in the code. Found by Linux Verification Center (linuxtesting.org) with Svace. Suggested-by: Jan Kara Signed-off-by: Roman Smirnov Reviewed-by: Sergey Shtylyov Signed-off-by: Jan Kara Message-Id: <20240327132755.13945-1-r.smirnov@omp.ru> Signed-off-by: Sasha Levin --- fs/udf/udftime.c | 11 ++++++++--- 1 file changed, 8 insertions(+), 3 deletions(-) diff --git a/fs/udf/udftime.c b/fs/udf/udftime.c index 758163af39c26..78ecc633606fb 100644 --- a/fs/udf/udftime.c +++ b/fs/udf/udftime.c @@ -46,13 +46,18 @@ udf_disk_stamp_to_time(struct timespec64 *dest, struct timestamp src) dest->tv_sec = mktime64(year, src.month, src.day, src.hour, src.minute, src.second); dest->tv_sec -= offset * 60; - dest->tv_nsec = 1000 * (src.centiseconds * 10000 + - src.hundredsOfMicroseconds * 100 + src.microseconds); + /* * Sanitize nanosecond field since reportedly some filesystems are * recorded with bogus sub-second values. */ - dest->tv_nsec %= NSEC_PER_SEC; + if (src.centiseconds < 100 && src.hundredsOfMicroseconds < 100 && + src.microseconds < 100) { + dest->tv_nsec = 1000 * (src.centiseconds * 10000 + + src.hundredsOfMicroseconds * 100 + src.microseconds); + } else { + dest->tv_nsec = 0; + } } void -- 2.43.0