lshw/0001-Fix-few-memory-leaks.patch

From 71cf63b7bb7bb212580cc7c8e6c75a4f645d79f1 Mon Sep 17 00:00:00 2001
From: Shivaprasad G Bhat <sbhat@linux.ibm.com>
Date: Wed, 20 May 2020 06:27:05 -0500
Subject: [PATCH 01/18] Fix few memory leaks

Valgrind showed some leaks with scandir usage in sysfs.cc.
Patch audits all the scandir usage and fixes where required.

Signed-off-by: Shivaprasad G Bhat <sbhat@linux.ibm.com>
---
 src/core/parisc.cc | 10 ++++++----
 src/core/spd.cc    |  4 ++++
 src/core/sysfs.cc  | 32 ++++++++++++++++++++++++++++----
 3 files changed, 38 insertions(+), 8 deletions(-)

diff --git a/src/core/parisc.cc b/src/core/parisc.cc
index 80344d28c6ba..1e531e32bbc2 100644
--- a/src/core/parisc.cc
+++ b/src/core/parisc.cc
@@ -561,11 +561,13 @@ static bool scan_device(hwNode & node, string name = "")
   else
   {
     for (int i = 0; i < n; i++)
-      if(matches(namelist[i]->d_name, "^[0-9]+(:[0-9]+)*$"))
     {
-      pushd(namelist[i]->d_name);
-      scan_device(curnode?*curnode:node, namelist[i]->d_name);
-      popd();
+      if(matches(namelist[i]->d_name, "^[0-9]+(:[0-9]+)*$"))
+      {
+        pushd(namelist[i]->d_name);
+        scan_device(curnode?*curnode:node, namelist[i]->d_name);
+        popd();
+      }
       free(namelist[i]);
     }
     free(namelist);
diff --git a/src/core/spd.cc b/src/core/spd.cc
index 061d0fd3e186..a304d061a008 100644
--- a/src/core/spd.cc
+++ b/src/core/spd.cc
@@ -192,8 +192,12 @@ static bool scan_eeproms(hwNode & memory)
     return false;
 
   for (int i = 0; i < n; i++)
+  {
     if (scan_eeprom(memory, namelist[i]->d_name))
       current_bank++;
+    free(namelist[i]);
+  }
+  free(namelist);
 
   return true;
 }
diff --git a/src/core/sysfs.cc b/src/core/sysfs.cc
index ee8b1da06c78..4e2df1c9cb09 100644
--- a/src/core/sysfs.cc
+++ b/src/core/sysfs.cc
@@ -83,7 +83,7 @@ static string sysfs_getbustype(const string & path)
 {
   struct dirent **namelist;
   int i, n;
-  string devname;
+  string bustype = "";
 
 /*
   to determine to which kind of bus a device is connected:
@@ -96,17 +96,28 @@ static string sysfs_getbustype(const string & path)
   n = scandir(".", &namelist, selectdir, alphasort);
   popd();
 
+  if (n <= 0)
+    return "";
+
   for (i = 0; i < n; i++)
   {
-    devname =
+    string devname =
       string(fs.path + "/bus/") + string(namelist[i]->d_name) +
       "/devices/" + basename(path.c_str());
 
     if (samefile(devname, path))
-      return string(namelist[i]->d_name);
+    {
+      bustype = string(namelist[i]->d_name);
+      break;
+    }
+    free(namelist[i]);
   }
 
-  return "";
+  for (int j = i; j < n; j++)
+    free(namelist[j]);
+  free(namelist);
+
+  return bustype;
 }
 
 
@@ -405,7 +416,11 @@ vector < entry > entry::devices() const
     entry e = sysfs::entry(This->devpath + "/" + string(namelist[i]->d_name));
     if(e.hassubdir("subsystem"))
 	    result.push_back(e);
+    free(namelist[i]);
   }
+  if (namelist)
+    free(namelist);
+
   if(pushd("block"))
   {
     int count = scandir(".", &namelist, selectdir, alphasort);
@@ -414,7 +429,10 @@ vector < entry > entry::devices() const
       entry e = sysfs::entry(This->devpath + "/block/" + string(namelist[i]->d_name));
       if(e.hassubdir("subsystem"))
 	      result.push_back(e);
+      free(namelist[i]);
     }
+    if (namelist)
+      free(namelist);
     popd();
   }
   popd();
@@ -435,8 +453,11 @@ vector < entry > sysfs::entries_by_bus(const string & busname)
   {
     entry e = sysfs::entry::byBus(busname, namelist[i]->d_name);
     result.push_back(e);
+    free(namelist[i]);
   }
   popd();
+  if (namelist)
+    free(namelist);
   return result;
 }
 
@@ -454,8 +475,11 @@ vector < entry > sysfs::entries_by_class(const string & classname)
   {
     entry e = sysfs::entry::byClass(classname, namelist[i]->d_name);
     result.push_back(e);
+    free(namelist[i]);
   }
   popd();
+  if (namelist)
+    free(namelist);
   return result;
 }
 
-- 
2.17.1