Re: [PATCH] mm/mmap: Fix vma_merge() offset when expanding the next vma

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On 30.01.23 20:57, Liam R. Howlett wrote:
The vm_pgoff was being set incorrectly when expanding the next VMA to a
lower address.  Fix the issue by using the mid->vm_pgoff value for this
merge case (aka case 8).  Note that this does not change case 3's
vm_pgoff as next and mid are the same VMA.

Reported-by: Sanan Hasanov <sanan.hasanov@xxxxxxxxxxxxxxx>
Link: https://lore.kernel.org/linux-mm/IA1PR07MB983017D2FBA174D2FF78CEB6ABCE9@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx/
Cc: Matthew Wilcox <willy@xxxxxxxxxxxxx>
Cc: David Hildenbrand <david@xxxxxxxxxx>
Cc: Hugh Dickins <hughd@xxxxxxxxxx>

Fixes: ?

Signed-off-by: Liam R. Howlett <Liam.Howlett@xxxxxxxxxx>
---
  mm/mmap.c | 2 +-
  1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/mm/mmap.c b/mm/mmap.c
index 00d90bbc250e..614ea2d93b0a 100644
--- a/mm/mmap.c
+++ b/mm/mmap.c
@@ -978,7 +978,7 @@ struct vm_area_struct *vma_merge(struct vma_iterator *vmi, struct mm_struct *mm,
  			vma = next;			/* case 3 */
  			vma_start = addr;
  			vma_end = next->vm_end;
-			vma_pgoff = next->vm_pgoff;
+			vma_pgoff = mid->vm_pgoff;
  			err = 0;
  			if (mid != next) {		/* case 8 */
  				remove = mid;

Acked-by: David Hildenbrand <david@xxxxxxxxxx>

Thanks!

--
Thanks,

David / dhildenb





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