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authorStefan Metzmacher <metze@samba.org>2011-02-24 11:15:06 +0100
committerStefan Metzmacher <metze@samba.org>2011-02-24 12:29:56 +0100
commite2532816400f005574c7452e5c4e30a3a8067771 (patch)
tree76df258bff5fdf1fa184ecda7458c3e53d1a50a1 /source4/dynconfig
parent9bf1032cb773a3eda90d0c6d379c5938690209e8 (diff)
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s4:dynconfig: fix segfault in the set_dyn_*() functions
We should not try to call free on a const string (the default one). Now we make sure that the dyn_* variable is never NULL and only allocated if it's not the default value. metze Autobuild-User: Stefan Metzmacher <metze@samba.org> Autobuild-Date: Thu Feb 24 12:29:56 CET 2011 on sn-devel-104
Diffstat (limited to 'source4/dynconfig')
-rw-r--r--source4/dynconfig/dynconfig.c37
1 files changed, 25 insertions, 12 deletions
diff --git a/source4/dynconfig/dynconfig.c b/source4/dynconfig/dynconfig.c
index 45b7b73720..65e57e0fc1 100644
--- a/source4/dynconfig/dynconfig.c
+++ b/source4/dynconfig/dynconfig.c
@@ -45,25 +45,38 @@
#define DEFINE_DYN_CONFIG_PARAM(name) \
const char *dyn_##name = name; \
\
- const char *get_dyn_##name(void) \
+bool is_default_dyn_##name(void) \
{\
- if (dyn_##name == NULL) {\
- return name;\
- }\
- return dyn_##name;\
+ if (strcmp(name, dyn_##name) == 0) { \
+ return true; \
+ } \
+ return false; \
}\
\
- const char *set_dyn_##name(const char *newpath) \
+const char *get_dyn_##name(void) \
{\
- if (dyn_##name) {\
- free(discard_const(dyn_##name)); \
- }\
- dyn_##name = strdup(newpath);\
return dyn_##name;\
}\
- bool is_default_dyn_##name(void) \
+\
+const char *set_dyn_##name(const char *newpath) \
{\
- return (dyn_##name == NULL);\
+ if (newpath == NULL) { \
+ return NULL; \
+ } \
+ if (strcmp(name, newpath) == 0) { \
+ return dyn_##name; \
+ } \
+ newpath = strdup(newpath);\
+ if (newpath == NULL) { \
+ return NULL; \
+ } \
+ if (is_default_dyn_##name()) { \
+ /* do not free a static string */ \
+ } else if (dyn_##name) {\
+ free(discard_const(dyn_##name)); \
+ }\
+ dyn_##name = newpath; \
+ return dyn_##name;\
}
/* these are in common with s3 */