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ext4: replace BUG_ON with proper error handling in ext4_read_inline_folio 

Replace BUG_ON() with proper error handling when inline data size
exceeds PAGE_SIZE. This prevents kernel panic and allows the system to
continue running while properly reporting the filesystem corruption.

The error is logged via ext4_error_inode(), the buffer head is released
to prevent memory leak, and -EFSCORRUPTED is returned to indicate
filesystem corruption.

Signed-off-by: Yuto Ohnuki <ytohnuki@amazon.com>
Link: https://patch.msgid.link/20260223123345.14838-2-ytohnuki@amazon.com
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Cc: stable@kernel.org
master
Yuto Ohnuki 2026-02-23 12:33:46 +00:00 committed by Theodore Ts'o
parent 1308255bbf
commit 356227096e
1 changed files with 9 additions and 1 deletions
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10
fs/ext4/inline.c
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@ -522,7 +522,15 @@ static int ext4_read_inline_folio(struct inode *inode, struct folio *folio)
goto out;
len = min_t(size_t, ext4_get_inline_size(inode), i_size_read(inode));
BUG_ON(len > PAGE_SIZE);
if (len > PAGE_SIZE) {
ext4_error_inode(inode, __func__, __LINE__, 0,
"inline size %zu exceeds PAGE_SIZE", len);
ret = -EFSCORRUPTED;
brelse(iloc.bh);
goto out;
}
kaddr = kmap_local_folio(folio, 0);
ret = ext4_read_inline_data(inode, kaddr, len, &iloc);
kaddr = folio_zero_tail(folio, len, kaddr + len);