From: Kim Jones <kim-marie.jones@intel.com>
Date: Wed, 17 Aug 2016 09:08:27 +0000 (+0100)
Subject: hugepages: check for error if readdir returns NULL
X-Git-Tag: collectd-5.7.0~119^2
X-Git-Url: https://git.octo.it/?p=collectd.git;a=commitdiff_plain;h=51b24f4c2a15f3f97c2989a36be82e18843b449c

hugepages: check for error if readdir returns NULL

Change-Id: Ib361b648407c7052218c1f6b9b624cb7aa799634
Signed-off-by: Kim Jones <kim-marie.jones@intel.com>
---

diff --git a/src/hugepages.c b/src/hugepages.c
index 120dd798..ac9441d0 100644
--- a/src/hugepages.c
+++ b/src/hugepages.c
@@ -187,6 +187,7 @@ static int read_syshugepages(const char* path, const char* node)
   while ((result = readdir(dir)) != NULL) {
     if (strncmp(result->d_name, hugepages_dir, sizeof(hugepages_dir)-1)) {
       /* not node dir */
+      errno = 0;
       continue;
     }
 
@@ -196,10 +197,17 @@ static int read_syshugepages(const char* path, const char* node)
     e_info.d_name = result->d_name;
     e_info.node = node;
     walk_directory(path2, read_hugepage_entry, &e_info, 0);
+    errno = 0;
   }
 
-  closedir(dir);
+  /* Check if NULL return from readdir() was an error */
+  if (errno != 0) {
+      ERROR("%s: readdir failed", g_plugin_name);
+      closedir(dir);
+      return -1;
+  }
 
+  closedir(dir);
   return 0;
 }
 
@@ -234,15 +242,23 @@ static int read_nodes(void)
   while ((result = readdir(dir)) != NULL) {
     if (strncmp(result->d_name, node_string, sizeof(node_string)-1)) {
       /* not node dir */
+      errno = 0;
       continue;
     }
 
     ssnprintf(path, (size_t) lim, sys_node_hugepages, result->d_name);
     read_syshugepages(path, result->d_name);
+    errno = 0;
   }
 
-  closedir(dir);
+  /* Check if NULL return from readdir() was an error */
+  if (errno != 0) {
+      ERROR("%s: readdir failed", g_plugin_name);
+      closedir(dir);
+      return -1;
+  }
 
+  closedir(dir);
   return 0;
 }