From 096e59edc98646edb1072c646c631729bee04ad0 Mon Sep 17 00:00:00 2001
From: Kay Sievers <kay.sievers@vrfy.org>
Date: Mon, 17 Nov 2008 02:01:37 +0100
Subject: [PATCH] limit $attr(<symlink>) magic to well-known links only

---
 udev/lib/libudev-device.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/udev/lib/libudev-device.c b/udev/lib/libudev-device.c
index c4714e408..055263bbe 100644
--- a/udev/lib/libudev-device.c
+++ b/udev/lib/libudev-device.c
@@ -859,11 +859,16 @@ const char *udev_device_get_sysattr_value(struct udev_device *udev_device, const
 	}
 
 	if (S_ISLNK(statbuf.st_mode)) {
-		/* links return the last element of the target path */
 		char target[UTIL_NAME_SIZE];
 		int len;
 		char *pos;
 
+		/* some core links return the last element of the target path */
+		if (strcmp(sysattr, "driver") != 0 &&
+		    strcmp(sysattr, "subsystem") != 0 &&
+		    strcmp(sysattr, "module") != 0)
+			goto out;
+
 		len = readlink(path, target, sizeof(target));
 		if (len > 0) {
 			target[len] = '\0';
-- 
2.30.2