fork: fix incorrect fput of ->exe_file causing use-after-free

[karo-tx-linux.git] / kernel / fork.c

diff --git a/kernel/fork.c b/kernel/fork.c
index e075b7780421dee1d8243b9dc178248398c5f189..cbbea277b3fba7a8a1ff73ffaf620202a706036a 100644 (file)
--- a/kernel/fork.c
+++ b/kernel/fork.c
@@ -806,6 +806,7 @@ static struct mm_struct *mm_init(struct mm_struct *mm, struct task_struct *p,
        mm_init_cpumask(mm);
        mm_init_aio(mm);
        mm_init_owner(mm, p);
+       RCU_INIT_POINTER(mm->exe_file, NULL);
        mmu_notifier_mm_init(mm);
        init_tlb_flush_pending(mm);
 #if defined(CONFIG_TRANSPARENT_HUGEPAGE) && !USE_SPLIT_PMD_PTLOCKS