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authorVlastimil Babka <vbabka@suse.cz>2023-02-28 04:00:14 +0300
committerAndrew Morton <akpm@linux-foundation.org>2023-02-28 04:00:14 +0300
commit4c6759967826b87f56c73e0f1deb7b76379ccd23 (patch)
treeee59d43c1fcc8d1a95a7788825024d39b6b28daa /mm
parent1ec35eadc3b448c91a6b763371a7073444e95f9d (diff)
downloadlinux-4c6759967826b87f56c73e0f1deb7b76379ccd23.tar.xz
mm/mremap: fix dup_anon_vma() in vma_merge() case 4
In case 4, we are shrinking 'prev' (PPPP in the comment) and expanding 'mid' (NNNN). So we need to make sure 'mid' clones the anon_vma from 'prev', if it doesn't have any. After commit 0503ea8f5ba7 ("mm/mmap: remove __vma_adjust()") we can fail to do that due to wrong parameters for dup_anon_vma(). The call is a no-op because res == next, adjust == mid and mid == next. Fix it. Link: https://lkml.kernel.org/r/ad91d62b-37eb-4b73-707a-3c45c9e16256@suse.cz Fixes: 0503ea8f5ba7 ("mm/mmap: remove __vma_adjust()") Signed-off-by: Vlastimil Babka <vbabka@suse.cz> Reviewed-by: Liam R. Howlett <Liam.Howlett@oracle.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Diffstat (limited to 'mm')
-rw-r--r--mm/mmap.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/mm/mmap.c b/mm/mmap.c
index 20f21f0949dd..740b54be3ed4 100644
--- a/mm/mmap.c
+++ b/mm/mmap.c
@@ -973,7 +973,7 @@ struct vm_area_struct *vma_merge(struct vma_iterator *vmi, struct mm_struct *mm,
vma_end = addr;
adjust = mid;
adj_next = -(vma->vm_end - addr);
- err = dup_anon_vma(res, adjust);
+ err = dup_anon_vma(adjust, prev);
} else {
vma = next; /* case 3 */
vma_start = addr;