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f2fs: fix to detect inconsistent nat entry during truncation

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As Roman Smirnov reported as below:

"
There is a possible bug in f2fs_truncate_inode_blocks():

    if (err < 0 && err != -ENOENT)
    			goto fail;
        ...
        offset[1] = 0;
        offset[0]++;
        nofs += err;

If err = -ENOENT then nofs will sum with an error code,
which is strange behaviour. Also if nofs < ENOENT this will
cause an overflow. err will be equal to -ENOENT with the
following call stack:

truncate_nodes()
  f2fs_get_node_page()
     __get_node_page()
        read_node_page()
"

If nat is corrupted, truncate_nodes() may return -ENOENT, and
f2fs_truncate_inode_blocks() doesn't handle such error correctly,
fix it.

Reported-by: Roman Smirnov <r.smirnov@omp.ru>
Closes: https://lore.kernel.org/linux-f2fs-devel/085b27fd2b364a3c8c3a9ca77363e246@omp.ru
Signed-off-by: Chao Yu <chao@kernel.org>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
This commit is contained in:
Chao Yu 2024-03-22 22:59:55 +08:00 committed by Jaegeuk Kim
parent 3127f1010c
commit 92c556ed63
1 changed files with 11 additions and 1 deletions
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12
fs/f2fs/node.c
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@ -1187,7 +1187,17 @@ skip_partial:
default:
BUG();
}
if (err < 0 && err != -ENOENT)
if (err == -ENOENT) {
set_sbi_flag(F2FS_P_SB(page), SBI_NEED_FSCK);
f2fs_handle_error(sbi, ERROR_INVALID_BLKADDR);
f2fs_err_ratelimited(sbi,
"truncate node fail, ino:%lu, nid:%u, "
"offset[0]:%d, offset[1]:%d, nofs:%d",
inode->i_ino, dn.nid, offset[0],
offset[1], nofs);
err = 0;
}
if (err < 0)
goto fail;
if (offset[1] == 0 &&
ri->i_nid[offset[0] - NODE_DIR1_BLOCK]) {