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| author | Peter Xu <peterx@redhat.com> | 2020-04-07 21:40:09 -0400 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2020-04-07 19:34:31 -0700 |
| commit | ba841078cd0557b43b59c63f5c048b12168f0db2 (patch) | |
| tree | 3697b4a407d713c5aca73827a2d34574865508e8 /mm/gup.c | |
| parent | 63bef48fd6c9d3f1ba4f0e23b4da1e007db6a3c0 (diff) | |
mm/mempolicy: Allow lookup_node() to handle fatal signal
lookup_node() uses gup to pin the page and get node information. It
checks against ret>=0 assuming the page will be filled in. However it's
also possible that gup will return zero, for example, when the thread is
quickly killed with a fatal signal. Teach lookup_node() to gracefully
return an error -EFAULT if it happens.
Meanwhile, initialize "page" to NULL to avoid potential risk of
exploiting the pointer.
Fixes: 4426e945df58 ("mm/gup: allow VM_FAULT_RETRY for multiple times")
Reported-by: syzbot+693dc11fcb53120b5559@syzkaller.appspotmail.com
Signed-off-by: Peter Xu <peterx@redhat.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/gup.c')
0 files changed, 0 insertions, 0 deletions