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remap_file_pages: correctly handle the case of a NULL vm_ops pointer

In commit 0b173bc ("mm: kill vma flag VM_CAN_NONLINEAR") we
replaced the VM_CAN_NONLINEAR test with checking whether the mapping has
a '->remap_pages()' vm operation, but there is no guarantee that there
it even has a vm_ops pointer at all.

Add the appropriate test for NULL vm_ops.

Reported-by: Sasha Levin <>
Cc: Konstantin Khlebnikov <>
Cc: Andrew Morton <>
Signed-off-by: Linus Torvalds <>
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commit deb521c44fa529b24cc78a64702757a683f82487 1 parent 17dbe27
@torvalds torvalds authored
Showing with 1 addition and 1 deletion.
  1. +1 −1  mm/fremap.c
2  mm/fremap.c
@@ -169,7 +169,7 @@ SYSCALL_DEFINE5(remap_file_pages, unsigned long, start, unsigned long, size,
if (vma->vm_private_data && !(vma->vm_flags & VM_NONLINEAR))
goto out;
- if (!vma->vm_ops->remap_pages)
+ if (!vma->vm_ops || !vma->vm_ops->remap_pages)
goto out;
if (start < vma->vm_start || start + size > vma->vm_end)
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