diff options
| -rw-r--r-- | fs/userfaultfd.c | 10 |
1 files changed, 9 insertions, 1 deletions
diff --git a/fs/userfaultfd.c b/fs/userfaultfd.c index e211b99d33c4..89800fc7dc9d 100644 --- a/fs/userfaultfd.c +++ b/fs/userfaultfd.c @@ -735,10 +735,18 @@ void mremap_userfaultfd_prep(struct vm_area_struct *vma, struct userfaultfd_ctx *ctx; ctx = vma->vm_userfaultfd_ctx.ctx; - if (ctx && (ctx->features & UFFD_FEATURE_EVENT_REMAP)) { + + if (!ctx) + return; + + if (ctx->features & UFFD_FEATURE_EVENT_REMAP) { vm_ctx->ctx = ctx; userfaultfd_ctx_get(ctx); WRITE_ONCE(ctx->mmap_changing, true); + } else { + /* Drop uffd context if remap feature not enabled */ + vma->vm_userfaultfd_ctx = NULL_VM_UFFD_CTX; + vma->vm_flags &= ~(VM_UFFD_WP | VM_UFFD_MISSING); } } |