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| author | Max Filippov <jcmvbkbc@gmail.com> | 2023-07-01 13:31:55 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2023-07-05 20:27:37 +0300 |
| commit | 6b2849b3e05d5dcda36a000ec81a15caa828e0a8 (patch) | |
| tree | f52ea9ffdc48524212b84b426e2e7342f65eee05 /mm | |
| parent | 0f4ac6b4c5f00f45b7a429c8a5b028a598c6400c (diff) | |
| download | linux-6b2849b3e05d5dcda36a000ec81a15caa828e0a8.tar.xz | |
xtensa: fix lock_mm_and_find_vma in case VMA not found
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@gmail.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'mm')
| -rw-r--r-- | mm/nommu.c | 7 |
1 files changed, 6 insertions, 1 deletions
diff --git a/mm/nommu.c b/mm/nommu.c index da26b3fec9eb..8e8fe491d914 100644 --- a/mm/nommu.c +++ b/mm/nommu.c @@ -688,8 +688,13 @@ 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; } /* |