This is a note to let you know that I've just added the patch titled
xtensa: fix lock_mm_and_find_vma in case VMA not found
to the 6.4-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
xtensa-fix-lock_mm_and_find_vma-in-case-vma-not-found.patch
and it can be found in the queue-6.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 03f889378f33aa9a9d8e5f49ba94134cf6158090 Mon Sep 17 00:00:00 2001
From: Max Filippov <jcmvbkbc@xxxxxxxxx>
Date: Sat, 1 Jul 2023 03:31:55 -0700
Subject: xtensa: fix lock_mm_and_find_vma in case VMA not found
From: Max Filippov <jcmvbkbc@xxxxxxxxx>
commit 03f889378f33aa9a9d8e5f49ba94134cf6158090 upstream.
MMU version of lock_mm_and_find_vma releases the mm lock before
returning when VMA is not found. Do the same in noMMU version.
This fixes hang on an attempt to handle protection fault.
Fixes: d85a143b69ab ("xtensa: fix NOMMU build with lock_mm_and_find_vma() conversion")
Signed-off-by: Max Filippov <jcmvbkbc@xxxxxxxxx>
Signed-off-by: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
mm/nommu.c | 7 ++++++-
1 file changed, 6 insertions(+), 1 deletion(-)
--- a/mm/nommu.c
+++ b/mm/nommu.c
@@ -637,8 +637,13 @@ EXPORT_SYMBOL(find_vma);
struct vm_area_struct *lock_mm_and_find_vma(struct mm_struct *mm,
unsigned long addr, struct pt_regs *regs)
{
+ struct vm_area_struct *vma;
+
mmap_read_lock(mm);
- return vma_lookup(mm, addr);
+ vma = vma_lookup(mm, addr);
+ if (!vma)
+ mmap_read_unlock(mm);
+ return vma;
}
/*
Patches currently in stable-queue which might be from jcmvbkbc@xxxxxxxxx are
queue-6.4/xtensa-fix-lock_mm_and_find_vma-in-case-vma-not-found.patch
