import PULS_20180308

[GitHub/mt8127/android_kernel_alcatel_ttab.git] / fs / proc / base.c

diff --git a/fs/proc/base.c b/fs/proc/base.c
index 361b02119902da4656197c222047a06b113912c8..1caa60e5271e76f687f88faae669ad74b0198169 100644 (file)
--- a/fs/proc/base.c
+++ b/fs/proc/base.c
@@ -850,7 +850,8 @@ static ssize_t environ_read(struct file *file, char __user *buf,
        int ret = 0;
        struct mm_struct *mm = file->private_data;
 
-       if (!mm)
+       /* Ensure the process spawned far enough to have an environment. */
+       if (!mm || !mm->env_end)
                return 0;
 
        page = (char *)__get_free_page(GFP_TEMPORARY);