When do_brk_flags() fails, ensure the necessary locking is undone.
Fixes: e9bad648fe05 (mm/mmap: change do_brk_flags() to expand existing VMA and add do_brk_munmap())
Suggested-by: Hugh Dickins <hughd@xxxxxxxxxx>
Signed-off-by: Liam R. Howlett <Liam.Howlett@xxxxxxxxxx>
---
mm/mmap.c | 9 ++++++++-
1 file changed, 8 insertions(+), 1 deletion(-)
diff --git a/mm/mmap.c b/mm/mmap.c
index 9a07bc18e6aa..f25f53d7600d 100644
--- a/mm/mmap.c
+++ b/mm/mmap.c
@@ -3071,7 +3071,7 @@ static int do_brk_flags(struct ma_state *mas, struct vm_area_struct *vma,
vma->vm_end = addr + len;
vma->vm_flags |= VM_SOFTDIRTY;
if (mas_store_gfp(mas, vma, GFP_KERNEL))
- return -ENOMEM;
+ goto mas_expand_failed;
if (vma->anon_vma) {
anon_vma_interval_tree_post_update_vma(vma);
@@ -3113,6 +3113,13 @@ static int do_brk_flags(struct ma_state *mas, struct vm_area_struct *vma,
vma_alloc_fail:
vm_unacct_memory(len >> PAGE_SHIFT);
return -ENOMEM;
+
+mas_expand_failed:
+ if (vma->anon_vma) {
+ anon_vma_interval_tree_post_update_vma(vma);
+ anon_vma_unlock_write(vma->anon_vma);
+ }
+ return -ENOMEM;
}
int vm_brk_flags(unsigned long addr, unsigned long request, unsigned long flags)
--
2.35.1
