drm: fix the usage after free
For readdir_r(), the next directory entry is returned in caller-allocted
buffer (pointered by pent here).
https://bugs.freedesktop.org/show_bug.cgi?id=91704
Signed-off-by: Mathias Tillman <master.homer@gmail.com>
Signed-off-by: Jammy Zhou <Jammy.Zhou@amd.com>
Reviewed-by: Christian König <christian.koenig@amd.com>
diff --git a/xf86drm.c b/xf86drm.c
index 5e02969..a7cc643 100644
--- a/xf86drm.c
+++ b/xf86drm.c
@@ -2803,11 +2803,12 @@
while (readdir_r(sysdir, pent, &ent) == 0 && ent != NULL) {
if (strncmp(ent->d_name, name, len) == 0) {
+ snprintf(dev_name, sizeof(dev_name), DRM_DIR_NAME "/%s",
+ ent->d_name);
+
free(pent);
closedir(sysdir);
- snprintf(dev_name, sizeof(dev_name), DRM_DIR_NAME "/%s",
- ent->d_name);
return strdup(dev_name);
}
}