diff options
| author | Suren Baghdasaryan <surenb@google.com> | 2025-08-06 15:00:22 -0700 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2025-08-20 18:36:32 +0200 |
| commit | 1202abad7a7ccd28c426d2844771a387b07629a4 (patch) | |
| tree | 2a31c6a4ddd6dd064316e412fb51f0406eb346f9 /include/net/aligned_data.h | |
| parent | 9fe1cb2766c74860de310eee3cca0f8173eb5f90 (diff) | |
userfaultfd: fix a crash in UFFDIO_MOVE when PMD is a migration entry
commit aba6faec0103ed8f169be8dce2ead41fcb689446 upstream.
When UFFDIO_MOVE encounters a migration PMD entry, it proceeds with
obtaining a folio and accessing it even though the entry is swp_entry_t.
Add the missing check and let split_huge_pmd() handle migration entries.
While at it also remove unnecessary folio check.
[surenb@google.com: remove extra folio check, per David]
Link: https://lkml.kernel.org/r/20250807200418.1963585-1-surenb@google.com
Link: https://lkml.kernel.org/r/20250806220022.926763-1-surenb@google.com
Fixes: adef440691ba ("userfaultfd: UFFDIO_MOVE uABI")
Signed-off-by: Suren Baghdasaryan <surenb@google.com>
Reported-by: syzbot+b446dbe27035ef6bd6c2@syzkaller.appspotmail.com
Closes: https://lore.kernel.org/all/68794b5c.a70a0220.693ce.0050.GAE@google.com/
Reviewed-by: Peter Xu <peterx@redhat.com>
Acked-by: David Hildenbrand <david@redhat.com>
Cc: Andrea Arcangeli <aarcange@redhat.com>
Cc: Lokesh Gidra <lokeshgidra@google.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'include/net/aligned_data.h')
0 files changed, 0 insertions, 0 deletions