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diff --git a/sys/compat/linuxkpi/common/include/linux/string.h b/sys/compat/linuxkpi/common/include/linux/string.h
--- a/sys/compat/linuxkpi/common/include/linux/string.h
+++ b/sys/compat/linuxkpi/common/include/linux/string.h
@@ -98,6 +98,15 @@
return (dst);
}
+static inline char *
+strndup_user(const char __user *ustr, long n)
+{
+ if (n < 1)
+ return (ERR_PTR(-EINVAL));
+
+ return (memdup_user_nul(ustr, n - 1));
+}
+
static inline char *
kstrdup(const char *string, gfp_t gfp)
{

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