Messages in this thread Patch in this message | | | From | Defang Bo <> | Subject | [PATCH] powerpc/mm: avoid null pointer dereference in flush_tlb_mm | Date | Fri, 25 Dec 2020 15:11:11 +0800 |
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Similar to commit<0dc294f7>, there should be a check for 'mm' to prevent Null pointer dereference in case of 'mm' argument was legitimately passed.
Signed-off-by: Defang Bo <bodefang@126.com> --- arch/powerpc/mm/nohash/tlb.c | 3 +++ 1 file changed, 3 insertions(+)
diff --git a/arch/powerpc/mm/nohash/tlb.c b/arch/powerpc/mm/nohash/tlb.c index 5872f69..09796c9 100644 --- a/arch/powerpc/mm/nohash/tlb.c +++ b/arch/powerpc/mm/nohash/tlb.c @@ -268,6 +268,9 @@ void flush_tlb_mm(struct mm_struct *mm) { unsigned int pid; + if (unlikely(!mm)) + return; + preempt_disable(); pid = mm->context.id; if (unlikely(pid == MMU_NO_CONTEXT)) -- 2.7.4
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