1 files changed, 2 insertions, 0 deletions

diff --git a/arch/arm/kernel/swp_emulate.c b/arch/arm/kernel/swp_emulate.c
index df745188f5de..ab1017bd1667 100644
--- a/arch/arm/kernel/swp_emulate.c
+++ b/arch/arm/kernel/swp_emulate.c
@@ -109,10 +109,12 @@ static void set_segfault(struct pt_regs *regs, unsigned long addr)
 {
         siginfo_t info;
 
+        down_read(&current->mm->mmap_sem);
         if (find_vma(current->mm, addr) == NULL)
                 info.si_code = SEGV_MAPERR;
         else
                 info.si_code = SEGV_ACCERR;
+        up_read(&current->mm->mmap_sem);
 
         info.si_signo = SIGSEGV;
         info.si_errno = 0;