From: Ville Syrjälä <ville.syrjala@linux.intel.com>
Date: Sat, 11 Apr 2020 21:08:52 +0000 (+0300)
Subject: [PATCH] fix realpath vs. firefox
X-Git-Tag: archive/raspbian/2.4.101-2+rpi1^2~1
X-Git-Url: https://dgit.raspbian.org/?a=commitdiff_plain;h=dd543153bababb199b1506cbdc9926dba06edf68;p=libdrm.git

[PATCH] fix realpath vs. firefox


Gbp-Pq: Name fix-realpath-vs-firefox.diff
---

diff --git a/xf86drm.c b/xf86drm.c
index d240f95..76e415c 100644
--- a/xf86drm.c
+++ b/xf86drm.c
@@ -3011,9 +3011,11 @@ static int drmParseSubsystemType(int maj, int min)
     snprintf(path, sizeof(path), "/sys/dev/char/%d:%d/device", maj, min);
     if (!realpath(path, real_path))
         return -errno;
-    snprintf(path, sizeof(path), "%s", real_path);
-
-    subsystem_type = get_subsystem_type(path);
+    subsystem_type = get_subsystem_type(real_path);
+    if (subsystem_type >= 0)
+        memcpy(path, real_path, sizeof(path));
+    else
+        subsystem_type = get_subsystem_type(path);
     if (subsystem_type == DRM_BUS_VIRTIO) {
         strncat(path, "/..", PATH_MAX);
         subsystem_type = get_subsystem_type(path);