The patch titled
Subject: filemap: avoid truncating 64-bit offset to 32 bits
has been added to the -mm mm-hotfixes-unstable branch. Its filename is
filemap-avoid-truncating-64-bit-offset-to-32-bits.patch
This patch will shortly appear at
https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/filemap-avoid-truncating-64-bit-offset-to-32-bits.patch
This patch will later appear in the mm-hotfixes-unstable branch at
git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
Before you just go and hit "reply", please:
a) Consider who else should be cc'ed
b) Prefer to cc a suitable mailing list as well
c) Ideally: find the original patch on the mailing list and do a
reply-to-all to that, adding suitable additional cc's
*** Remember to use Documentation/process/submit-checklist.rst when testing your code ***
The -mm tree is included into linux-next via the mm-everything
branch at git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
and is updated there every 2-3 working days
------------------------------------------------------
From: Marco Nelissen <marco.nelissen@xxxxxxxxx>
Subject: filemap: avoid truncating 64-bit offset to 32 bits
Date: Thu, 2 Jan 2025 11:04:11 -0800
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@xxxxxxxxx
Fixes: 54fa39ac2e00b ("iomap: use mapping_seek_hole_data")
Signed-off-by: Marco Nelissen <marco.nelissen@xxxxxxxxx>
Cc: Matthew Wilcox (Oracle) <willy@xxxxxxxxxxxxx>
Cc: <stable@xxxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/filemap.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/mm/filemap.c~filemap-avoid-truncating-64-bit-offset-to-32-bits
+++ a/mm/filemap.c
@@ -2996,7 +2996,7 @@ static inline loff_t folio_seek_hole_dat
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:
_
Patches currently in -mm which might be from marco.nelissen@xxxxxxxxx are
filemap-avoid-truncating-64-bit-offset-to-32-bits.patch
