iomap: Fix possible overflow condition in iomap_write_delalloc_scan
[ Upstream commit eee2d2e6ea
]
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>
Signed-off-by: Sasha Levin <sashal@kernel.org>
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@ -927,7 +927,7 @@ static int iomap_write_delalloc_scan(struct inode *inode,
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* the end of this data range, not the end of the folio.
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*/
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*punch_start_byte = min_t(loff_t, end_byte,
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folio_next_index(folio) << PAGE_SHIFT);
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folio_pos(folio) + folio_size(folio));
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}
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/* move offset to start of next folio in range */
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