Commit f505e6c9 authored by Marco Nelissen's avatar Marco Nelissen Committed by Andrew Morton
Browse files

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.

Link: https://lkml.kernel.org/r/20250102190540.1356838-1-marco.nelissen@gmail.com


Fixes: 54fa39ac ("iomap: use mapping_seek_hole_data")
Signed-off-by: default avatarMarco Nelissen <marco.nelissen@gmail.com>
Cc: Matthew Wilcox (Oracle) <willy@infradead.org>
Cc: <stable@vger.kernel.org>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
parent 4bbb6df6

mm/filemap.c

+1 −1
Original line number Diff line number Diff line
@@ -2996,7 +2996,7 @@ 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: