* [PATCH] mm/mmap: Fix do_brk_munmap() when munmapping multiple mappings
@ 2022-05-19 15:05 Liam Howlett
0 siblings, 0 replies; only message in thread
From: Liam Howlett @ 2022-05-19 15:05 UTC (permalink / raw)
To: maple-tree, linux-mm, linux-kernel, Andrew Morton
If the newbrk is less than the last brk vma start, then munmap entire
VMA(s).
Signed-off-by: Liam R. Howlett <Liam.Howlett@oracle.com>
---
mm/mmap.c | 3 +--
1 file changed, 1 insertion(+), 2 deletions(-)
diff --git a/mm/mmap.c b/mm/mmap.c
index f1fc9c5c068b..c065a3d9b5da 100644
--- a/mm/mmap.c
+++ b/mm/mmap.c
@@ -2942,8 +2942,7 @@ static int do_brk_munmap(struct ma_state *mas, struct vm_area_struct *vma,
arch_unmap(mm, newbrk, oldbrk);
- if (likely((vma->vm_end < oldbrk) ||
- ((vma->vm_start == newbrk) && (vma->vm_end == oldbrk)))) {
+ if (likely((vma->vm_end < oldbrk) || (vma->vm_start >= newbrk))) {
/* remove entire mapping(s) */
ret = do_mas_align_munmap(mas, vma, mm, newbrk, oldbrk, uf,
true);
--
2.35.1
^ permalink raw reply related [flat|nested] only message in thread
only message in thread, other threads:[~2022-05-19 15:06 UTC | newest]
Thread overview: (only message) (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2022-05-19 15:05 [PATCH] mm/mmap: Fix do_brk_munmap() when munmapping multiple mappings Liam Howlett
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.