From c91265cd0efb83778f015b4d4b1129bd2cfd075e Mon Sep 17 00:00:00 2001 From: André Fabian Silva Delgado Date: Sat, 14 May 2016 05:45:59 -0300 Subject: Linux-libre 4.5.4-gnu --- fs/proc/base.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) (limited to 'fs/proc') diff --git a/fs/proc/base.c b/fs/proc/base.c index 11aba74cb..80e4bc69f 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); -- cgit v1.2.3-54-g00ecf