Mesa (master): egl: Fix a potential segfault in driver suffix matching.

[Chia-I Wu]

Module: Mesa
Branch: master
Commit: 8e6a964411ea3e1d7dc4c86c314e326e3be2b0eb
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=8e6a964411ea3e1d7dc4c86c314e326e3be2b0eb

Author: Chia-I Wu <olvaffe at gmail.com>
Date:   Wed Feb  3 12:35:57 2010 +0800

egl: Fix a potential segfault in driver suffix matching.

The driver suffix might be NULL on some platforms.  Perform the matching
only when there is a suffix.

---

 src/egl/main/egldriver.c |    8 +++++---
 1 files changed, 5 insertions(+), 3 deletions(-)

diff --git a/src/egl/main/egldriver.c b/src/egl/main/egldriver.c
index 8e623a0..d58991a 100644
--- a/src/egl/main/egldriver.c
+++ b/src/egl/main/egldriver.c
@@ -347,9 +347,11 @@ _eglPreloadPattern(const char *dir, size_t len, void *preload_data)
       if (strncmp(dirent->d_name, prefix, prefix_len) != 0)
          continue;
       /* match the suffix */
-      p = dirent->d_name + dirent_len - suffix_len;
-      if (p < dirent->d_name || strcmp(p, suffix) != 0)
-         continue;
+      if (suffix) {
+         p = dirent->d_name + dirent_len - suffix_len;
+         if (p < dirent->d_name || strcmp(p, suffix) != 0)
+            continue;
+      }
 
       /* make a full path and load the driver */
       if (len + dirent_len + 1 <= sizeof(path)) {