+ nommu-fix-do_munmap-error-path.patch added to mm-hotfixes-unstable branch

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The patch titled
     Subject: nommu: fix do_munmap() error path
has been added to the -mm mm-hotfixes-unstable branch.  Its filename is
     nommu-fix-do_munmap-error-path.patch

This patch will shortly appear at
     https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/nommu-fix-do_munmap-error-path.patch

This patch will later appear in the mm-hotfixes-unstable branch at
    git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm

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branch at git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
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------------------------------------------------------
From: Liam Howlett <liam.howlett@xxxxxxxxxx>
Subject: nommu: fix do_munmap() error path
Date: Mon, 9 Jan 2023 20:57:21 +0000

When removing a VMA from the tree fails due to no memory, do not free the
VMA since a reference still exists.

Link: https://lkml.kernel.org/r/20230109205708.956103-1-Liam.Howlett@xxxxxxxxxx
Fixes: 8220543df148 ("nommu: remove uses of VMA linked list")
Signed-off-by: Liam R. Howlett <Liam.Howlett@xxxxxxxxxx>
Cc: Matthew Wilcox (Oracle) <willy@xxxxxxxxxxxxx>
Cc: Vlastimil Babka <vbabka@xxxxxxx>
Cc: Yu Zhao <yuzhao@xxxxxxxxxx>
Cc: <stable@xxxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---

 mm/nommu.c |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

--- a/mm/nommu.c~nommu-fix-do_munmap-error-path
+++ a/mm/nommu.c
@@ -1509,7 +1509,8 @@ int do_munmap(struct mm_struct *mm, unsi
 erase_whole_vma:
 	if (delete_vma_from_mm(vma))
 		ret = -ENOMEM;
-	delete_vma(mm, vma);
+	else
+		delete_vma(mm, vma);
 	return ret;
 }
 
_

Patches currently in -mm which might be from liam.howlett@xxxxxxxxxx are

nommu-fix-memory-leak-in-do_mmap-error-path.patch
nommu-fix-do_munmap-error-path.patch
nommu-fix-split_vma-map_count-error.patch
maple_tree-remove-gfp_zero-from-kmem_cache_alloc-and-kmem_cache_alloc_bulk.patch




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