| Message ID | 1608880271-2294955-1-git-send-email-bodefang@126.com (mailing list archive) |
|---|---|
| State | Superseded |
| Headers | show |
| Series | powerpc/mm: avoid null pointer dereference in flush_tlb_mm | expand |
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))
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(+)