From: Hillf Danton <hdan...@sina.com>
__get_user_pages_locked() will return 0 instead of -EINTR after commit
4426e945df588 ("mm/gup: allow VM_FAULT_RETRY for multiple times") which
added extra code to allow gup detect fatal signal faster.
Restore the original -EINTR behavior.
Cc: Andrew Morton <a...@linux-foundation.org>
Cc: Thomas Gleixner <t...@linutronix.de>
Cc: Peter Zijlstra <pet...@infradead.org>
Fixes: 4426e945df58 ("mm/gup: allow VM_FAULT_RETRY for multiple times")
Reported-by: syzbot+3be1a33f04dc782e9...@syzkaller.appspotmail.com
Signed-off-by: Hillf Danton <hdan...@sina.com>
Acked-by: Michal Hocko <mho...@suse.com>
Signed-off-by: Peter Xu <pet...@redhat.com>
Signed-off-by: Linus Torvalds <torva...@linux-foundation.org>
https://jira.sw.ru/browse/PSBM-102938
(cherry picked from commit ae46d2aa6a7fbe8ca0946f24b061b6ccdc6c3f25)
Signed-off-by: Andrey Ryabinin <aryabi...@virtuozzo.com>
---
mm/gup.c | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)
diff --git a/mm/gup.c b/mm/gup.c
index 3d08b68c210f..049e05960e1e 100644
--- a/mm/gup.c
+++ b/mm/gup.c
@@ -941,8 +941,11 @@ static __always_inline long __get_user_pages_locked(struct
task_struct *tsk,
* start trying again otherwise it can loop forever.
*/
- if (fatal_signal_pending(current))
+ if (fatal_signal_pending(current)) {
+ if (!pages_done)
+ pages_done = -EINTR;
break;
+ }
*locked = 1;
ret = down_read_killable(&mm->mmap_sem);
--
2.25.3
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