From mboxrd@z Thu Jan 1 00:00:00 1970 Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.remote-ip=100.103.45.18 ARC-Seal: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; cv=none; t=1794315501; b=IccsFzLBIXzSLkYMwLiiAyQ0m13zADEDmckmY/vv+shRUx0mJ3FwwgUSnnxWYb07QyXD BGxBvz3cMRMp0Lo8pGg34vLvsUUJk0UyJdnXZny4vlmCIdK3Xc5p/Q0qE05JwXqFobR0n EileMk/rMZg15TkuniURp8V6e8o9my8Ca23DOFy3oE3BpcFmDmE6t9V/a5EBmy3EEHK0W r+ZR+sdFC6Au45zXMdq5Zl5BjgWYS5hHWvV38N00N31NJ3iFgBSmVHIzu+5vWP4QuwySC 9IgK90sREQpIsRufEeeMbmuDgoX/QJklnngKh/PnxgaiX3YFafw4CBg4Y/iJAo+VdjA== ARC-Message-Signature: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; c=relaxed/relaxed; t=1794315501; h=Received:DKIM-Signature:From:To:Cc:Subject:Date:Message-ID:X-Mailer: In-Reply-To:References:MIME-Version:Content-Transfer-Encoding; bh=ywYVID8G930j6+bGkd3cU7Eb/95G4BaEVDPJSul/Tnk=; b=mUKgrDQ4+v3TVC5SsnM6sgITuvkRChvjq57R1/avT1QhvykDAW3Bn8A/gULvdccX6j87 MRhJvfEHlvqG1biUxfguCPK4Uy7oHIu0zgE/9tqUlLGrMTU35AUEBIMjWVh6lqH6OEl64 g7k+DjEGtJtWTqwLqlPo4BfMFIfl/eRPX8Bcxv7NnRl+uoq0H7Aj4WHJOfPoNw87i1yLy TZtzpufjI4No4Tde+/Hk1wIrfFaUX+jzKMMYCob5E4HRy07rlzRMqNEqfFE9PMxbLsaxG SQrwvOt+k3tFEljofwrphbSEKiaM8ac1hPlRhMnyWCpvru2Z/+pIRtpVmR1nOuADqzA== ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass header.d=kernel.org header.i=@kernel.org header.a=rsa-sha256 header.s=k20260515 header.b="YZ4Hjy0/"; arc=none smtp.remote-ip=100.103.45.18 Received: from smtp.kernel.org (quasi.space.kernel.org [100.103.45.18]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature ECDSA (prime256v1)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 5AE67606BFF3 for ; Tue, 10 Nov 2026 12:58:21 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.a=rsa-sha256 header.s=k20260515 header.b=YZ4Hjy0/ Received: by smtp.kernel.org (Postfix) with ESMTPSA id 6331B1F008A1; Tue, 10 Nov 2026 12:58:20 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1794315500; bh=ywYVID8G930j6+bGkd3cU7Eb/95G4BaEVDPJSul/Tnk=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=YZ4Hjy0/2oBznL9GbtmGUtLEos2PV4oid8+0j7OVhPn8Ob2Aj3x85mbdoOwLBWVy4 M0JVBp61yIkzcpcIBT+BLjgcrq78BFJ2Xl2oMNTp18oHkrXmV1X9vUaNEdObcRKJsW Rs1bCUyKEYoved0VFCADMfTZmUM4zpeXYceiVHWUOFl71TfcQcCdbmqT1ZHglhePju 3q2hNQgPHAlHFu7OYzLJ+JRqHvc7/lEcjpk1yGG5XBXsXzUHSRFjpCcw65ArGCTNdX RdMgU1bGPcxKjGcbBFEyH+cjYclmpXg/GWwPM9+QuPbrVxim886HAMpJd0DT+ACi5P arJasaHBzQ2KA== From: Sasha Levin To: stable@vger.kernel.org Cc: Jiaming Zhang , Andreas Gruenbacher , Sasha Levin Subject: [PATCH 5.15.y] gfs2: reject invalid inode sizes Date: Tue, 10 Nov 2026 07:58:19 -0500 Message-ID: <20261110125801.1569612-1-sashal@kernel.org> X-Mailer: git-send-email 2.53.0 In-Reply-To: <20261107055835-failed-5.15-33ed0a0567e0@kernel.org> References: <20261107055835-failed-5.15-33ed0a0567e0@kernel.org> X-Mailing-List: stable@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 Content-Transfer-Encoding: 8bit From: Jiaming Zhang [ Upstream commit 33ed0a0567e0abe66ea65e89dad2e35082890fbe ] A corrupted GFS2 image can store a dinode size that is larger than what VFS i_size can represent. gfs2_dinode_in() reads the on-disk di_size as a u64 and writes it directly into inode->i_size. If the value is larger than S64_MAX, the incore i_size becomes negative. That negative value can bypass the existing stuffed inode size check: inode->i_size > gfs2_max_stuffed_size(ip) Later, gfs2_quotad may try to sync the quota file and unstuff the quota inode. gfs2_unstuffer_folio() reads the negative i_size into an unsigned length and passes it to memcpy(), turning it into a huge copy size and triggering a out-of-bound issue. Reject dinodes whose size exceeds sb->s_maxbytes before storing the value in inode->i_size. Also make the stuffed inode check use the raw on-disk size while it is still unsigned. Fixes: 70376c7ff312 ("gfs2: Always check inode size of inline inodes") Closes: https://lore.kernel.org/lkml/CANypQFaF6bvORKKbRALvEL0k_epFaneFiOQqco4gjdmKVbdURg@mail.gmail.com/ Assisted-by: Codex:gpt-5.5-xhigh Cc: stable@vger.kernel.org Signed-off-by: Jiaming Zhang Signed-off-by: Andreas Gruenbacher [ sashal: adjusted context for direct inode->i_state access and existing dinode field assignments ] Signed-off-by: Sasha Levin --- fs/gfs2/glops.c | 10 ++++++++-- 1 file changed, 8 insertions(+), 2 deletions(-) diff --git a/fs/gfs2/glops.c b/fs/gfs2/glops.c index 8a077de9ee0a4..67351df7b4b33 100644 --- a/fs/gfs2/glops.c +++ b/fs/gfs2/glops.c @@ -405,6 +405,7 @@ static int gfs2_dinode_in(struct gfs2_inode *ip, const void *buf) umode_t mode = be32_to_cpu(str->di_mode); struct inode *inode = &ip->i_inode; bool is_new = inode->i_state & I_NEW; + u64 size; if (unlikely(ip->i_no_addr != be64_to_cpu(str->di_num.no_addr))) { gfs2_consist_inode(ip); @@ -430,7 +431,12 @@ static int gfs2_dinode_in(struct gfs2_inode *ip, const void *buf) i_uid_write(inode, be32_to_cpu(str->di_uid)); i_gid_write(inode, be32_to_cpu(str->di_gid)); set_nlink(inode, be32_to_cpu(str->di_nlink)); - i_size_write(inode, be64_to_cpu(str->di_size)); + size = be64_to_cpu(str->di_size); + if (unlikely(size > inode->i_sb->s_maxbytes)) { + gfs2_consist_inode(ip); + return -EIO; + } + i_size_write(inode, size); gfs2_set_inode_blocks(inode, be64_to_cpu(str->di_blocks)); atime.tv_sec = be64_to_cpu(str->di_atime); atime.tv_nsec = be32_to_cpu(str->di_atime_nsec); @@ -468,7 +474,7 @@ static int gfs2_dinode_in(struct gfs2_inode *ip, const void *buf) ip->i_depth = (u8)depth; ip->i_entries = be32_to_cpu(str->di_entries); - if (gfs2_is_stuffed(ip) && inode->i_size > gfs2_max_stuffed_size(ip)) { + if (gfs2_is_stuffed(ip) && size > gfs2_max_stuffed_size(ip)) { gfs2_consist_inode(ip); return -EIO; } -- 2.53.0