diff options
Diffstat (limited to 'arch/s390/lib/uaccess_pt.c')
| -rw-r--r-- | arch/s390/lib/uaccess_pt.c | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/arch/s390/lib/uaccess_pt.c b/arch/s390/lib/uaccess_pt.c index a70ee84c0241..c1aaf22c326b 100644 --- a/arch/s390/lib/uaccess_pt.c +++ b/arch/s390/lib/uaccess_pt.c @@ -172,6 +172,8 @@ static size_t strnlen_user_pt(size_t count, const char __user *src) unsigned long offset, done, len, kaddr; size_t len_str; + if (unlikely(!count)) + return 0; if (segment_eq(get_fs(), KERNEL_DS)) return strnlen((const char __kernel __force *) src, count) + 1; done = 0; @@ -202,6 +204,8 @@ static size_t strncpy_from_user_pt(size_t count, const char __user *src, { size_t n = strnlen_user_pt(count, src); + if (unlikely(!count)) + return 0; if (!n) return -EFAULT; if (n > count) |