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 62A1F15D5D9; Wed, 9 Oct 2024 22:40:01 +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=1728513601; cv=none; b=a+9ZOdTNs1Fetuim4kq31PIUr915X1zaFgszVtl3IMjUWHLeEFaHUvLf53aNAe5G3QQyxCIkrmeFY9bsMUv2fnG1u3+TmfULoUQ7hwgEp2SlDC7lzkdniSVkyhp6HatuFQ5kIyVeeM6mwza3/WdD3xhg9QdNXdg9iWMW7LFgCRg= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1728513601; c=relaxed/simple; bh=sPshICpxVRjFbvgTeVK73jk+hGYOGpl2GZjEkV/f0DE=; h=Message-ID:Subject:From:To:Cc:Date:In-Reply-To:References: Content-Type:MIME-Version; b=o/jCzg0CVyenSRQuy0KElk5hIEDe4M8JxqqaVm2O9sBBFy5X96qbZfwuhBA3R7ljO3cS8ddH3BHtCSLnMWPAX1wkBREBE8reQP/H8sdMAVAZBWOZRtp5mBI99U8eKpoG8QkM6BjMTrnRcsrjZ1TLe/pI0k1DHB9Bg6QoI+95qqc= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=GCcNx7vA; 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="GCcNx7vA" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 6B098C4CEC3; Wed, 9 Oct 2024 22:40:00 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1728513601; bh=sPshICpxVRjFbvgTeVK73jk+hGYOGpl2GZjEkV/f0DE=; h=Subject:From:To:Cc:Date:In-Reply-To:References:From; b=GCcNx7vAKcY66w6PRyjtCASzHM3Dvu1+zytL1Ej+90DXuJWKDUHxLd47vWjU2Ip09 QbMaoCf2xoHTN3x9+h8hezJ6gx0IW1pUgIjcGMrJYHNHpoyZ0Zr0A8LylknWV7QvxY ER1q7+W4R1YkKKB/qQAYAjrIqXi0BOGSClRGAN1MvksKn/nwm/n0xJhDXnFaxa+JO3 1QAuP3RrWCtNm2aws2kN2dUWeoI0T+fN0Q6TFY3p+19ziu821P3v2KpINgZwYjLlWG dWjE7juhSLIjVVGYU0UotLxzZAnjvaTUe1HrtrGq0bNrJWyHkNJFyGG50/wxtCCD1i YL9zw1/VZ6EpQ== Message-ID: <439cb2078a8eefa782bc8da4a77bb8ac43725ba4.camel@kernel.org> Subject: Re: [PATCH][next] fs: Fix uninitialized scalar variable now From: Jeff Layton To: Dan Carpenter , "Everest K.C." Cc: viro@zeniv.linux.org.uk, brauner@kernel.org, jack@suse.cz, skhan@linuxfoundation.org, linux-fsdevel@vger.kernel.org, kernel-janitors@vger.kernel.org, linux-kernel@vger.kernel.org Date: Wed, 09 Oct 2024 18:39:59 -0400 In-Reply-To: <263ceb04-f909-45d8-b9b2-5de86617ea25@stanley.mountain> References: <20241009200528.36343-1-everestkc@everestkc.com.np> <263ceb04-f909-45d8-b9b2-5de86617ea25@stanley.mountain> Autocrypt: addr=jlayton@kernel.org; prefer-encrypt=mutual; keydata=mQINBE6V0TwBEADXhJg7s8wFDwBMEvn0qyhAnzFLTOCHooMZyx7XO7dAiIhDSi7G1NPxw n8jdFUQMCR/GlpozMFlSFiZXiObE7sef9rTtM68ukUyZM4pJ9l0KjQNgDJ6Fr342Htkjxu/kFV1Wv egyjnSsFt7EGoDjdKqr1TS9syJYFjagYtvWk/UfHlW09X+jOh4vYtfX7iYSx/NfqV3W1D7EDi0PqV T2h6v8i8YqsATFPwO4nuiTmL6I40ZofxVd+9wdRI4Db8yUNA4ZSP2nqLcLtFjClYRBoJvRWvsv4lm 0OX6MYPtv76hka8lW4mnRmZqqx3UtfHX/hF/zH24Gj7A6sYKYLCU3YrI2Ogiu7/ksKcl7goQjpvtV YrOOI5VGLHge0awt7bhMCTM9KAfPc+xL/ZxAMVWd3NCk5SamL2cE99UWgtvNOIYU8m6EjTLhsj8sn 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The variable > > could be accessed inside the if-else statements following the > > variable declaration, before it has been initialized. > >=20 > > This patch initializes the variable to > > `inode_set_ctime_current(inode)` by default. > >=20 > > This issue was reported by Coverity Scan. > >=20 > > Signed-off-by: Everest K.C. >=20 > Fixes: d8d11298e8a1 ("fs: handle delegated timestamps in setattr_copy_mgt= ime") >=20 > Maybe the WARN_ON_ONCE() should be updated to check ATTR_ATIME as well? >=20 > regards, > dan carpenter >=20 > > --- > > fs/attr.c | 4 +--- > > 1 file changed, 1 insertion(+), 3 deletions(-) > >=20 > > diff --git a/fs/attr.c b/fs/attr.c > > index c614b954bda5..77523af2e62d 100644 > > --- a/fs/attr.c > > +++ b/fs/attr.c > > @@ -284,7 +284,7 @@ EXPORT_SYMBOL(inode_newsize_ok); > > static void setattr_copy_mgtime(struct inode *inode, const struct iatt= r *attr) > > { > > unsigned int ia_valid =3D attr->ia_valid; > > - struct timespec64 now; > > + struct timespec64 now =3D inode_set_ctime_current(inode); > > =20 > > if (ia_valid & ATTR_CTIME) { > > /* > > @@ -293,8 +293,6 @@ static void setattr_copy_mgtime(struct inode *inode= , const struct iattr *attr) > > */ > > if (ia_valid & ATTR_DELEG) > > now =3D inode_set_ctime_deleg(inode, attr->ia_ctime); > > - else > > - now =3D inode_set_ctime_current(inode); > > } else { > > /* If ATTR_CTIME isn't set, then ATTR_MTIME shouldn't be either. */ > > WARN_ON_ONCE(ia_valid & ATTR_MTIME); > > --=20 > > 2.43.0 > >=20 This doesn't look correct. inode_set_ctime_current will update the time to the current time and then inode_set_ctime_deleg() won't work properly if the time being set is earlier than that. I proposed a different fix earlier today which should be correct: https://lore.kernel.org/linux-fsdevel/20241009-mgtime-v1-1-383b9e0481b5@ker= nel.org/ Thanks, --=20 Jeff Layton