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Diffstat (limited to 'arch/s390/lib/uaccess_pt.c')
-rw-r--r--arch/s390/lib/uaccess_pt.c4
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)