1 files changed, 2 insertions, 1 deletions

diff --git a/fs/proc/base.c b/fs/proc/base.c
index b1755b23893e..92e37e224cd2 100644
--- a/fs/proc/base.c
+++ b/fs/proc/base.c
@@ -955,7 +955,8 @@ static ssize_t environ_read(struct file *file, char __user *buf,
         struct mm_struct *mm = file->private_data;
         unsigned long env_start, env_end;
 
-        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);