From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from lamorak.hansenpartnership.com (lamorak.hansenpartnership.com [198.37.111.173]) (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 3581D1C54AA; Wed, 16 Jul 2025 13:26:04 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=198.37.111.173 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1752672367; cv=none; b=gCcN6MhC7ulwO35zBTsDQYeS2cuCLJ1OKBqkp7jpHZ7pWrHJJGSUZekjCg2DQset3QqX/wHA/5yZ8M5/WjuPF/TEHn1UA/05e9+YTQOmFqXhTefniC9t0dVPK45M+k7en5SG8X58XZH8pbCTUYJRh+Nf3dgW7+vVE310rQA88Ig= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1752672367; c=relaxed/simple; bh=S3vbo1Uc5mIXUvR/z5z8bfmhiPJf0YBwu4i/p3VtPpI=; h=Message-ID:Subject:From:To:Cc:Date:In-Reply-To:References: Content-Type:MIME-Version; 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<20250715-kmemleak_efi-v1-1-c07e68c76ae8@debian.org> <7fe68ef138e43a5cf83c8b5d2dd3fc8101a8a225.camel@HansenPartnership.com> Autocrypt: addr=James.Bottomley@HansenPartnership.com; prefer-encrypt=mutual; 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 8mT2Eh9SkH+YVOmaKsajgZgrBxA7fWmGoxXswEVxJIFj3vW7yNc0C5HaUdYa5iGOMs4kg2ht4s7yy7NRQuh7BifWjo6BQ6k4S1H+6axZucxhSV1L6zN9d+lr3Xo/vy1unzA== Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable User-Agent: Evolution 3.50.3 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 On Wed, 2025-07-16 at 06:16 -0700, Breno Leitao wrote: > On Wed, Jul 16, 2025 at 09:09:00AM -0400, James Bottomley wrote: > > On Wed, 2025-07-16 at 08:31 -0400, James Bottomley wrote: > > [...] > > > If the theory is correct, the leak is genuine and we need to > > > implement .free in efivarfs_context_ops to fix it. > >=20 > > Rather than trying to trace this, which will be hard, it might be > > easier just to try the fix below (not even compile tested) and see > > if > > it works.=C2=A0 Note there's no danger of a double free because when fc= - > > > s_fs_info is copied to sb->s_fs_info, the field is nulled in fc. > >=20 > > Regards, > >=20 > > James > >=20 > > --- > >=20 > > diff --git a/fs/efivarfs/super.c b/fs/efivarfs/super.c > > index c900d98bf494..90a619d027fd 100644 > > --- a/fs/efivarfs/super.c > > +++ b/fs/efivarfs/super.c > > @@ -390,10 +390,16 @@ static int efivarfs_reconfigure(struct > > fs_context *fc) > > =C2=A0 return 0; > > =C2=A0} > > =C2=A0 > > +static void efivarfs_fs_context_free(struct fs_context *fc) > > +{ > > + kfree(fc->s_fs_info); > > +} > > + > > =C2=A0static const struct fs_context_operations efivarfs_context_ops = =3D { > > =C2=A0 .get_tree =3D efivarfs_get_tree, > > =C2=A0 .parse_param =3D efivarfs_parse_param, > > =C2=A0 .reconfigure =3D efivarfs_reconfigure, > > + .free =3D efivarfs_fs_context_free, > > =C2=A0}; > > =C2=A0 > > =C2=A0static int efivarfs_check_missing(efi_char16_t *name16, efi_guid_= t > > vendor, >=20 > Hello James, >=20 > I was testing something very similar based on your previous email. I > can > confirm that the following patch make kmemleak happy.=20 >=20 > Regarding the fixes, I think this was introduced in commit > 5329aa5101f73c ("efivarfs: Add uid/gid mount options") >=20 > commit 035521e8a5029ea814337d680e0552ccab1f97e2 > Author: Breno Leitao > Date:=C2=A0=C2=A0 Wed Jul 16 06:08:57 2025 -0700 >=20 > =C2=A0=C2=A0=C2=A0 efivarfs: Fix memory leak of efivarfs_fs_info in fs_co= ntext error > paths > =C2=A0=C2=A0=C2=A0=20 > =C2=A0=C2=A0=C2=A0 When processing mount options, efivarfs allocates > efivarfs_fs_info (sfi) > =C2=A0=C2=A0=C2=A0 early in fs_context initialization. However, sfi is as= sociated > with the > =C2=A0=C2=A0=C2=A0 superblock and typically freed when the superblock is = destroyed. > If the > =C2=A0=C2=A0=C2=A0 fs_context is released (final put) before fill_super i= s > called=E2=80=94such as > =C2=A0=C2=A0=C2=A0 on error paths or during reconfiguration=E2=80=94the s= fi structure would > leak, > =C2=A0=C2=A0=C2=A0 as ownership never transfers to the superblock. > =C2=A0=C2=A0=C2=A0=20 > =C2=A0=C2=A0=C2=A0 Implement the .free callback in efivarfs_context_ops t= o ensure > any > =C2=A0=C2=A0=C2=A0 allocated sfi is properly freed if the fs_context is t= orn down > before > =C2=A0=C2=A0=C2=A0 fill_super, preventing this memory leak. > =C2=A0=C2=A0=C2=A0=20 > =C2=A0=C2=A0=C2=A0 Suggested-by: James Bottomley > > =C2=A0=C2=A0=C2=A0 Signed-off-by: Breno Leitao >=20 > diff --git a/fs/efivarfs/super.c b/fs/efivarfs/super.c > index c900d98bf4945..07a3b9293396b 100644 > --- a/fs/efivarfs/super.c > +++ b/fs/efivarfs/super.c > @@ -390,10 +390,22 @@ static int efivarfs_reconfigure(struct > fs_context *fc) > =C2=A0 return 0; > =C2=A0} > =C2=A0 > +static void efivarfs_free(struct fs_context *fc) > +{ > + struct efivarfs_fs_info *sfi; > + > + sfi =3D fc->s_fs_info; > + if (!sfi) > + return; Here, you'll excite the coccinelle checkers looking for if(x) free(x) because free() already also has a test for NULL. Other than that elision, it looks fine to me. Regards, James