diff options
Diffstat (limited to 'fs/proc/base.c')
| -rw-r--r-- | fs/proc/base.c | 5 |
1 files changed, 3 insertions, 2 deletions
diff --git a/fs/proc/base.c b/fs/proc/base.c index 4823113f2584..464df13a1c19 100644 --- a/fs/proc/base.c +++ b/fs/proc/base.c @@ -46,7 +46,7 @@ * Paul Mundt <paul.mundt@nokia.com>: * Overall revision about smaps. * - * Copyright (c) 2013, NVIDIA CORPORATION. All rights reserved. + * Copyright (c) 2018, NVIDIA CORPORATION. All rights reserved. */ #include <asm/uaccess.h> @@ -857,7 +857,8 @@ 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); |