cfgfile: fix leak on creation error

Unsuccesfull memory allocation for elements inside cfgfile
structure could result in resource leak.
Fixed by pointer verification after each malloc,
if malloc fail - error branch is proceeded with freeing memory.

Coverity issue: 195032
Fixes: d4cb8197589d ("cfgfile: support runtime modification")

Signed-off-by: Jacek Piasecki <jacekx.piasecki@intel.com>
Acked-by: Michal Jastrzebski <michalx.k.jastrzebski@intel.com>

diff --git a/lib/librte_cfgfile/rte_cfgfile.c b/lib/librte_cfgfile/rte_cfgfile.c
index 80077b6..eacf93a 100644 (file)
--- a/lib/librte_cfgfile/rte_cfgfile.c
+++ b/lib/librte_cfgfile/rte_cfgfile.c
@@ -303,7 +303,7 @@ rte_cfgfile_create(int flags)
                        CFG_ALLOC_SECTION_BATCH);
 
        if (cfg->sections == NULL)
-               return NULL;
+               goto error1;
 
        cfg->allocated_sections = CFG_ALLOC_SECTION_BATCH;
 
@@ -312,7 +312,7 @@ rte_cfgfile_create(int flags)
                        struct rte_cfgfile_entry) * CFG_ALLOC_ENTRY_BATCH);
 
                if (cfg->sections[i].entries == NULL)
-                       return NULL;
+                       goto error1;
 
                cfg->sections[i].num_entries = 0;
                cfg->sections[i].allocated_entries = CFG_ALLOC_ENTRY_BATCH;
@@ -320,7 +320,21 @@ rte_cfgfile_create(int flags)
 
        if (flags & CFG_FLAG_GLOBAL_SECTION)
                rte_cfgfile_add_section(cfg, "GLOBAL");
+
        return cfg;
+error1:
+       if (cfg->sections != NULL) {
+               for (i = 0; i < cfg->allocated_sections; i++) {
+                       if (cfg->sections[i].entries != NULL) {
+                               free(cfg->sections[i].entries);
+                               cfg->sections[i].entries = NULL;
+                       }
+               }
+               free(cfg->sections);
+               cfg->sections = NULL;
+       }
+       free(cfg);
+       return NULL;
 }
 
 int