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iomap: Fix possible overflow condition in iomap_write_delalloc_scan

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folio_next_index() returns an unsigned long value which left shifted
by PAGE_SHIFT could possibly cause an overflow on 32-bit system. Instead
use folio_pos(folio) + folio_size(folio), which does this correctly.

Suggested-by: Matthew Wilcox <willy@infradead.org>
Signed-off-by: Ritesh Harjani (IBM) <ritesh.list@gmail.com>
Reviewed-by: Darrick J. Wong <djwong@kernel.org>
This commit is contained in:
Ritesh Harjani (IBM) 2023-07-10 14:12:22 -07:00
parent cc86181a3b
commit eee2d2e6ea
1 changed files with 1 additions and 1 deletions
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2
fs/iomap/buffered-io.c
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@ -934,7 +934,7 @@ static int iomap_write_delalloc_scan(struct inode *inode,
* the end of this data range, not the end of the folio.
*/
*punch_start_byte = min_t(loff_t, end_byte,
folio_next_index(folio) << PAGE_SHIFT);
folio_pos(folio) + folio_size(folio));
}
/* move offset to start of next folio in range */