On Wed, Jul 24, 2013 at 11:48:19AM +0800, Libin wrote: >find_vma may return NULL, thus check the return >value to avoid NULL pointer dereference. > Reviewed-by: Wanpeng Li <liwanp@xxxxxxxxxxxxxxxxxx> >Signed-off-by: Libin <huawei.libin@xxxxxxxxxx> >--- > mm/huge_memory.c | 2 ++ > 1 file changed, 2 insertions(+) > >diff --git a/mm/huge_memory.c b/mm/huge_memory.c >index 243e710..d4423f4 100644 >--- a/mm/huge_memory.c >+++ b/mm/huge_memory.c >@@ -2294,6 +2294,8 @@ static void collapse_huge_page(struct mm_struct *mm, > goto out; > > vma = find_vma(mm, address); >+ if (!vma) >+ goto out; > hstart = (vma->vm_start + ~HPAGE_PMD_MASK) & HPAGE_PMD_MASK; > hend = vma->vm_end & HPAGE_PMD_MASK; > if (address < hstart || address + HPAGE_PMD_SIZE > hend) >-- >1.8.2.1 > > >-- >To unsubscribe, send a message with 'unsubscribe linux-mm' in >the body to majordomo@xxxxxxxxx. For more info on Linux MM, >see: http://www.linux-mm.org/ . >Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a> -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>