filemap: avoid truncating 64-bit offset to 32 bits

on 32-bit kernels, folio_seek_hole_data() was inadvertently truncating a 64-bit value to 32 bits, leading to a possible infinite loop when writing to an xfs filesystem. Signed-off-by: Marco Nelissen <[email protected]>
raspberrypi · Jan 4, 2025 · a40c744 · a40c744
1 parent de92e4b
commit a40c744
Showing 1 changed file with 1 addition and 1 deletion.
diff --git a/mm/filemap.c b/mm/filemap.c
@@ -3037,7 +3037,7 @@ static inline loff_t folio_seek_hole_data(struct xa_state *xas,
 		if (ops->is_partially_uptodate(folio, offset, bsz) ==
 							seek_data)
 			break;
-		start = (start + bsz) & ~(bsz - 1);
+		start = (start + bsz) & ~((u64)bsz - 1);
 		offset += bsz;
 	} while (offset < folio_size(folio));
 unlock: