xf86drm: ignore symlinks in process_device()103-regression-intel-mesa-buildtests-broken-by-libdrm-update

If the user has some UDev rules in place that creates symlinks for
one of the card or render nodes, and the name of the symlink is
too long, then drmDeviceAlloc() ends up truncating the name of
the node.
This in turn results in chaos in different subsystems. E.g.
vulkaninfo dies early with this:

Code 0 : failed to stat DRM primary node /dev/dri/my-favorite- (VK_ERROR_INITIALIZATION_FAILED)
(if the symlink is called /dev/dri/my-favorite-card-node)

Signed-off-by: Tobias Jakobi <tjakobi@math.uni-bielefeld.de>

1 files changed, 4 insertions, 1 deletions

diff --git a/xf86drm.c b/xf86drm.c
index 2e76f0ea..150c6095 100644
--- a/xf86drm.c
+++ b/xf86drm.c
@@ -4479,7 +4479,10 @@ process_device(drmDevicePtr *device, const char *d_name,
         return -1;
 
     snprintf(node, PATH_MAX, "%s/%s", DRM_DIR_NAME, d_name);
-    if (stat(node, &sbuf))
+    if (lstat(node, &sbuf))
+        return -1;
+
+    if (S_ISLNK(sbuf.st_mode))
         return -1;
 
     maj = major(sbuf.st_rdev);