[PATCH v2 0/2] mm/gup: stop leaking pinned pages in low memory conditions

[John Hubbard]

Changes since v1 [1]:

1) Thanks to David Hildenbrand for this part: added a second patch to
fix the same issue (incomplete error handling for the return value from
check_and_migrate_movable_folios()), but this time in
memfd_pin_folios().

Please note that I am not set up to test memfd things, so at this point
all I can claim is that patch #2 doesn't prevent my test machine from
booting. :)

2) Fixed a typo in the comment, in the first patch.

3) Added review and ack tags.

[1] https://lore.kernel.org/20241016202242.456953-1-jhubbard@xxxxxxxxxx

Cc: "Matthew Wilcox (Oracle)" <willy@xxxxxxxxxxxxx>
Cc: Alistair Popple <apopple@xxxxxxxxxx>
Cc: Arnd Bergmann <arnd@xxxxxxxx>
Cc: Christoph Hellwig <hch@xxxxxxxxxxxxx>
Cc: Daniel Vetter <daniel.vetter@xxxxxxxx>
Cc: Dave Airlie <airlied@xxxxxxxxxx>
Cc: David Hildenbrand <david@xxxxxxxxxx>
Cc: Dongwon Kim <dongwon.kim@xxxxxxxxx>
Cc: Gerd Hoffmann <kraxel@xxxxxxxxxx>
Cc: Hugh Dickins <hughd@xxxxxxxxxx>
Cc: Jason Gunthorpe <jgg@xxxxxxxxxx>
Cc: Junxiao Chang <junxiao.chang@xxxxxxxxx>
Cc: Mike Kravetz <mike.kravetz@xxxxxxxxxx>
Cc: Minchan Kim <minchan@xxxxxxxxxx>
Cc: Oscar Salvador <osalvador@xxxxxxx>
Cc: Pasha Tatashin <pasha.tatashin@xxxxxxxxxx>
Cc: Peter Xu <peterx@xxxxxxxxxx>
Cc: Shigeru Yoshida <syoshida@xxxxxxxxxx>
Cc: Vivek Kasireddy <vivek.kasireddy@xxxxxxxxx>

John Hubbard (2):
  mm/gup: stop leaking pinned pages in low memory conditions
  mm/gup: memfd: stop leaking pinned pages in low memory conditions

 mm/gup.c | 19 ++++++++++++++-----
 1 file changed, 14 insertions(+), 5 deletions(-)


base-commit: 274995ffe748bbee39f1ca65c6a31a1800140b27
-- 
2.47.0