Implement memdup_user_nul() in the LinuxKPI.

MFC after: 1 week Submitted by: Johannes Lundberg <[email protected]> Sponsored by: Mellanox Technologies
dgwynne · Feb 16, 2018 · 2a76180 · 2a76180
1 parent 0317e3d
commit 2a76180
Showing 1 changed file with 16 additions and 0 deletions.
diff --git a/sys/compat/linuxkpi/common/include/linux/string.h b/sys/compat/linuxkpi/common/include/linux/string.h
@@ -70,6 +70,22 @@ memdup_user(const void *ptr, size_t len)
 	return (retval);
 }
 
+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)
 {