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mm/gup: Let __get_user_pages_locked() return -EINTR for fatal signal 

__get_user_pages_locked() will return 0 instead of -EINTR after commit
4426e945df ("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 <akpm@linux-foundation.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Peter Zijlstra <peterz@infradead.org>
Fixes: 4426e945df ("mm/gup: allow VM_FAULT_RETRY for multiple times")
Reported-by: syzbot+3be1a33f04dc782e9fd5@syzkaller.appspotmail.com
Signed-off-by: Hillf Danton <hdanton@sina.com>
Acked-by: Michal Hocko <mhocko@suse.com>
Signed-off-by: Peter Xu <peterx@redhat.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Hillf Danton 2020-04-08 11:59:24 -04:00 committed by Linus Torvalds
parent f5e94d10e4
commit ae46d2aa6a
1 changed files with 4 additions and 1 deletions
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5
mm/gup.c
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@ -1326,8 +1326,11 @@ 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;
}
ret = down_read_killable(&mm->mmap_sem);
if (ret) {