syzbot reports a bug as below:
loop0: detected capacity change from 0 to 40427
F2FS-fs (loop0): Wrong SSA boundary, start(3584) end(4096) blocks(3072)
F2FS-fs (loop0): Can't find valid F2FS filesystem in 1th superblock
F2FS-fs (loop0): invalid crc value
F2FS-fs (loop0): f2fs_convert_inline_folio: corrupted inline inode ino=3,
i_addr[0]:0x1601, run fsck to fix.
------------[ cut here ]------------
kernel BUG at fs/inode.c:753!
RIP: 0010:clear_inode+0x169/0x190 fs/inode.c:753
Call Trace:
<TASK>
evict+0x504/0x9c0 fs/inode.c:810
f2fs_fill_super+0x5612/0x6fa0 fs/f2fs/super.c:5047
get_tree_bdev_flags+0x40e/0x4d0 fs/super.c:1692
vfs_get_tree+0x8f/0x2b0 fs/super.c:1815
do_new_mount+0x2a2/0x9e0 fs/namespace.c:3808
do_mount fs/namespace.c:4136 [inline]
__do_sys_mount fs/namespace.c:4347 [inline]
__se_sys_mount+0x317/0x410 fs/namespace.c:4324
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
During f2fs_evict_inode(), clear_inode() detects that we missed to truncate
all page cache before destorying inode, that is because in below path, we
will create page #0 in cache, but missed to drop it in error path, let's fix
it.
- evict
- f2fs_evict_inode
- f2fs_truncate
- f2fs_convert_inline_inode
- f2fs_grab_cache_folio
: create page #0 in cache
- f2fs_convert_inline_folio
: sanity check failed, return -EFSCORRUPTED
- clear_inode detects that inode->i_data.nrpages is not zero
Fixes: 92dffd01790a ("f2fs: convert inline_data when i_size becomes large")
Reported-by: syzbot+90266696fe5daaceb...@syzkaller.appspotmail.com
Closes:
https://lore.kernel.org/linux-f2fs-devel/68c09802.050a0220.3c6139.000e....@google.com
Signed-off-by: Chao Yu <c...@kernel.org>
---
fs/f2fs/file.c | 10 +++++++++-
1 file changed, 9 insertions(+), 1 deletion(-)
diff --git a/fs/f2fs/file.c b/fs/f2fs/file.c
index 42faaed6a02d..1aae4361d0a8 100644
--- a/fs/f2fs/file.c
+++ b/fs/f2fs/file.c
@@ -904,8 +904,16 @@ int f2fs_truncate(struct inode *inode)
/* we should check inline_data size */
if (!f2fs_may_inline_data(inode)) {
err = f2fs_convert_inline_inode(inode);
- if (err)
+ if (err) {
+ /*
+ * Always truncate page #0 to avoid page cache
+ * leak in evict() path.
+ */
+ truncate_inode_pages_range(inode->i_mapping,
+ F2FS_BLK_TO_BYTES(0),
+ F2FS_BLK_END_BYTES(0));
return err;
+ }
}
err = f2fs_truncate_blocks(inode, i_size_read(inode), true);
--
2.49.0
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