Messages in this thread Patch in this message | | | From | Liam Howlett <> | Subject | [PATCH] mm/mmap: Avoid dereferencing next on null in BUG_ON() | Date | Thu, 19 May 2022 15:04:50 +0000 |
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Check there is a next before checking the bounds.
Signed-off-by: Liam R. Howlett <Liam.Howlett@oracle.com> --- mm/mmap.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/mm/mmap.c b/mm/mmap.c index 4279e2acd243..f1fc9c5c068b 100644 --- a/mm/mmap.c +++ b/mm/mmap.c @@ -583,7 +583,7 @@ inline int vma_expand(struct ma_state *mas, struct vm_area_struct *vma, } /* Not merging but overwriting any part of next is not handled. */ - VM_BUG_ON(!remove_next && next != vma && end > next->vm_start); + VM_BUG_ON(next && !remove_next && next != vma && end > next->vm_start); /* Only handles expanding */ VM_BUG_ON(vma->vm_start < start || vma->vm_end > end); -- 2.35.1
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