diff options
Diffstat (limited to 'arch/s390/kernel')
| -rw-r--r-- | arch/s390/kernel/debug.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/arch/s390/kernel/debug.c b/arch/s390/kernel/debug.c index 31430e9bcfdd..2612f634e826 100644 --- a/arch/s390/kernel/debug.c +++ b/arch/s390/kernel/debug.c @@ -1414,6 +1414,9 @@ static inline char *debug_get_user_string(const char __user *user_buf, { char *buffer; + if (!user_len) + return ERR_PTR(-EINVAL); + buffer = memdup_user_nul(user_buf, user_len); if (IS_ERR(buffer)) return buffer; |