From nobody Mon Oct 6 18:49:03 2025 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 0C2662E540D for ; Thu, 17 Jul 2025 13:26:44 +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=1752758804; cv=none; b=hSWFO3KwPDNwfLwW4v1+7TCLEanFuDnIkoKTdBO6eLzwzRx6yQx6ac3PEQzYuAHrjOaHztO5qL9jZe3ny0OPMP89ZulPsfwgr4jIFZ6/y8nP3vFbZO0liwGIaHxx9U4fE4qKEhssvaDHQRnGgbrRiCQsZToc8dt1PNyZMsyUpFw= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1752758804; c=relaxed/simple; bh=xwH9KsVkA9xR3sdKvSoirJ1o44ujVkiSADhgE4jH1cA=; h=From:To:Cc:Subject:Date:Message-ID:MIME-Version; b=gfmqXl79IqugoveRDGXoPORVy6fV8UJziqUktcY1vdwm8SZMkGR/lacxkwT/N3m05iDOmwA2ENWU0aZFkqbQK33sr2+9nbB/FNZkdf6X+pPQqnWG54FWY4ibce8TW6XBMNc7W+s1iR2fnQy9bnkMeWc7qMgpzgXGf6rNQnz5VI0= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=BsHcZe/x; 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="BsHcZe/x" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 399EFC4CEEB; Thu, 17 Jul 2025 13:26:42 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1752758803; bh=xwH9KsVkA9xR3sdKvSoirJ1o44ujVkiSADhgE4jH1cA=; h=From:To:Cc:Subject:Date:From; b=BsHcZe/xmFtJQuC3is2g8dqOg6oTys7hTJb5VVqNhx3RFbWHKoK2innuiDnsyckwf DDrmgyEUsk7BBD7FgAt1kRuChlk7vum/DUThYuL/eIrvqsn7Bp8dUgzribxQsa6Hpy 8BZy0LNHkLqfS5X8XpXjWN++Bd4Lg/EZanMzhBhyfyfFwY5g2AlgZn5h/S7Oo3lpr3 0D91bQvLqJLVrn6RFaLRodx8zszmUmrS0CPGTnhXFtmVzUiMtLfZrX8qZkz8UR6oT+ uYfCLkqefWza4fIe/XjR8BR69uci+KHsnjVMW0zhjFZwuJj9v+EyNQbGYjjIWX5pnZ r4vU+RM9Y2p0A== From: Chao Yu To: jaegeuk@kernel.org Cc: linux-f2fs-devel@lists.sourceforge.net, linux-kernel@vger.kernel.org, Chao Yu , stable@kernel.org, Jiaming Zhang Subject: [PATCH] f2fs: fix to avoid out-of-boundary access in dnode page Date: Thu, 17 Jul 2025 21:26:33 +0800 Message-ID: <20250717132633.1339965-1-chao@kernel.org> X-Mailer: git-send-email 2.50.0.727.gbf7dc18ff4-goog Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" As Jiaming Zhang reported: __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0x1c1/0x2a0 lib/dump_stack.c:120 print_address_description mm/kasan/report.c:378 [inline] print_report+0x17e/0x800 mm/kasan/report.c:480 kasan_report+0x147/0x180 mm/kasan/report.c:593 data_blkaddr fs/f2fs/f2fs.h:3053 [inline] f2fs_data_blkaddr fs/f2fs/f2fs.h:3058 [inline] f2fs_get_dnode_of_data+0x1a09/0x1c40 fs/f2fs/node.c:855 f2fs_reserve_block+0x53/0x310 fs/f2fs/data.c:1195 prepare_write_begin fs/f2fs/data.c:3395 [inline] f2fs_write_begin+0xf39/0x2190 fs/f2fs/data.c:3594 generic_perform_write+0x2c7/0x910 mm/filemap.c:4112 f2fs_buffered_write_iter fs/f2fs/file.c:4988 [inline] f2fs_file_write_iter+0x1ec8/0x2410 fs/f2fs/file.c:5216 new_sync_write fs/read_write.c:593 [inline] vfs_write+0x546/0xa90 fs/read_write.c:686 ksys_write+0x149/0x250 fs/read_write.c:738 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xf3/0x3d0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f The root cause is in the corrupted image, there is a dnode has the same node id w/ its inode, so during f2fs_get_dnode_of_data(), it tries to access block address in dnode at offset 934, however it parses the dnode as inode node, so that get_dnode_addr() returns 360, then it tries to access page address from 360 + 934 * 4 =3D 4096 w/ 4 bytes. To fix this issue, let's add sanity check for node id of all direct nodes during f2fs_get_dnode_of_data(). Cc: stable@kernel.org Reported-by: Jiaming Zhang Closes: https://groups.google.com/g/syzkaller/c/-ZnaaOOfO3M Signed-off-by: Chao Yu --- fs/f2fs/node.c | 10 ++++++++++ 1 file changed, 10 insertions(+) diff --git a/fs/f2fs/node.c b/fs/f2fs/node.c index 651537598759..12cab5c69fcd 100644 --- a/fs/f2fs/node.c +++ b/fs/f2fs/node.c @@ -815,6 +815,16 @@ int f2fs_get_dnode_of_data(struct dnode_of_data *dn, p= goff_t index, int mode) for (i =3D 1; i <=3D level; i++) { bool done =3D false; =20 + if (nids[i] && nids[i] =3D=3D dn->inode->i_ino) { + err =3D -EFSCORRUPTED; + f2fs_err_ratelimited(sbi, + "inode mapping table is corrupted, run fsck to fix it, " + "ino:%lu, nid:%u, level:%d, offset:%d", + dn->inode->i_ino, nids[i], level, offset[level]); + set_sbi_flag(sbi, SBI_NEED_FSCK); + goto release_pages; + } + if (!nids[i] && mode =3D=3D ALLOC_NODE) { /* alloc new node */ if (!f2fs_alloc_nid(sbi, &(nids[i]))) { --=20 2.49.0