MFC r329377:

Implement memdup_user_nul() in the LinuxKPI.

Submitted by:	Johannes Lundberg <johalun0@gmail.com>
Sponsored by:	Mellanox Technologies

1 files changed, 16 insertions, 0 deletions

diff --git a/sys/compat/linuxkpi/common/include/linux/string.h b/sys/compat/linuxkpi/common/include/linux/string.h
index a47eb42..918ff81 100644
--- a/sys/compat/linuxkpi/common/include/linux/string.h
+++ b/sys/compat/linuxkpi/common/include/linux/string.h
@@ -71,6 +71,22 @@ memdup_user(const void *ptr, size_t len)
 }
 
 static inline void *
+memdup_user_nul(const void *ptr, size_t len)
+{
+	char *retval;
+	int error;
+
+	retval = malloc(len + 1, M_KMALLOC, M_WAITOK);
+	error = linux_copyin(ptr, retval, len);
+	if (error != 0) {
+		free(retval, M_KMALLOC);
+		return (ERR_PTR(error));
+	}
+	retval[len] = '\0';
+	return (retval);
+}
+
+static inline void *
 kmemdup(const void *src, size_t len, gfp_t gfp)
 {
 	void *dst;