[PATCH] f2fs: fix to do sanity check on node blkaddr in truncate_node()

[PATCH] f2fs: fix to do sanity check on node blkaddr in truncate_node()

[Chao Yu]

syzbot reports a f2fs bug as below:

------------[ cut here ]------------
kernel BUG at fs/f2fs/segment.c:2534!
RIP: 0010:f2fs_invalidate_blocks+0x35f/0x370 fs/f2fs/segment.c:2534
Call Trace:
 truncate_node+0x1ae/0x8c0 fs/f2fs/node.c:909
 f2fs_remove_inode_page+0x5c2/0x870 fs/f2fs/node.c:1288
 f2fs_evict_inode+0x879/0x15c0 fs/f2fs/inode.c:856
 evict+0x4e8/0x9b0 fs/inode.c:723
 f2fs_handle_failed_inode+0x271/0x2e0 fs/f2fs/inode.c:986
 f2fs_create+0x357/0x530 fs/f2fs/namei.c:394
 lookup_open fs/namei.c:3595 [inline]
 open_last_lookups fs/namei.c:3694 [inline]
 path_openat+0x1c03/0x3590 fs/namei.c:3930
 do_filp_open+0x235/0x490 fs/namei.c:3960
 do_sys_openat2+0x13e/0x1d0 fs/open.c:1415
 do_sys_open fs/open.c:1430 [inline]
 __do_sys_openat fs/open.c:1446 [inline]
 __se_sys_openat fs/open.c:1441 [inline]
 __x64_sys_openat+0x247/0x2a0 fs/open.c:1441
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0010:f2fs_invalidate_blocks+0x35f/0x370 fs/f2fs/segment.c:2534

The root cause is: on a fuzzed image, blkaddr in nat entry may be
corrupted, then it will cause system panic when using it in
f2fs_invalidate_blocks(), to avoid this, let's add sanity check on
nat blkaddr in truncate_node().

Reported-by: syzbot+33379ce4ac76acf7d0c7@syzkaller.appspotmail.com
Closes: https://lore.kernel.org/linux-f2fs-devel/0000000000009a6cd706224ca720@google.com/
Cc: stable@vger.kernel.org
Signed-off-by: Chao Yu <chao@kernel.org>
---
 fs/f2fs/node.c | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/fs/f2fs/node.c b/fs/f2fs/node.c
index 59b13ff243fa..af36c6d6542b 100644
--- a/fs/f2fs/node.c
+++ b/fs/f2fs/node.c
@@ -905,6 +905,16 @@ static int truncate_node(struct dnode_of_data *dn)
 	if (err)
 		return err;
 
+	if (ni.blk_addr != NEW_ADDR &&
+		!f2fs_is_valid_blkaddr(sbi, ni.blk_addr, DATA_GENERIC_ENHANCE)) {
+		f2fs_err_ratelimited(sbi,
+			"nat entry is corrupted, run fsck to fix it, ino:%u, "
+			"nid:%u, blkaddr:%u", ni.ino, ni.nid, ni.blk_addr);
+		set_sbi_flag(sbi, SBI_NEED_FSCK);
+		f2fs_handle_error(sbi, ERROR_INCONSISTENT_NAT);
+		return -EFSCORRUPTED;
+	}
+
 	/* Deallocate node address */
 	f2fs_invalidate_blocks(sbi, ni.blk_addr);
 	dec_valid_node_count(sbi, dn->inode, dn->nid == dn->inode->i_ino);
-- 
2.40.1

Re: [f2fs-dev] [PATCH] f2fs: fix to do sanity check on node blkaddr in truncate_node()

[patchwork-bot+f2fs]

Hello:

This patch was applied to jaegeuk/f2fs.git (dev)
by Jaegeuk Kim <jaegeuk@kernel.org>:

On Wed, 16 Oct 2024 16:13:37 +0800 you wrote:
> syzbot reports a f2fs bug as below:
> 
> ------------[ cut here ]------------
> kernel BUG at fs/f2fs/segment.c:2534!
> RIP: 0010:f2fs_invalidate_blocks+0x35f/0x370 fs/f2fs/segment.c:2534
> Call Trace:
>  truncate_node+0x1ae/0x8c0 fs/f2fs/node.c:909
>  f2fs_remove_inode_page+0x5c2/0x870 fs/f2fs/node.c:1288
>  f2fs_evict_inode+0x879/0x15c0 fs/f2fs/inode.c:856
>  evict+0x4e8/0x9b0 fs/inode.c:723
>  f2fs_handle_failed_inode+0x271/0x2e0 fs/f2fs/inode.c:986
>  f2fs_create+0x357/0x530 fs/f2fs/namei.c:394
>  lookup_open fs/namei.c:3595 [inline]
>  open_last_lookups fs/namei.c:3694 [inline]
>  path_openat+0x1c03/0x3590 fs/namei.c:3930
>  do_filp_open+0x235/0x490 fs/namei.c:3960
>  do_sys_openat2+0x13e/0x1d0 fs/open.c:1415
>  do_sys_open fs/open.c:1430 [inline]
>  __do_sys_openat fs/open.c:1446 [inline]
>  __se_sys_openat fs/open.c:1441 [inline]
>  __x64_sys_openat+0x247/0x2a0 fs/open.c:1441
>  do_syscall_x64 arch/x86/entry/common.c:52 [inline]
>  do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
>  entry_SYSCALL_64_after_hwframe+0x77/0x7f
> RIP: 0010:f2fs_invalidate_blocks+0x35f/0x370 fs/f2fs/segment.c:2534
> 
> [...]

Here is the summary with links:
  - [f2fs-dev] f2fs: fix to do sanity check on node blkaddr in truncate_node()
    https://git.kernel.org/jaegeuk/f2fs/c/e767ae13e67d

You are awesome, thank you!
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