Remove strlower_m() and strupper_m() from source4 and common code.

This function is problematic because a string may expand in size when
changed into upper or lower case.  This will then push characters off
the end of the string in the s3 implementation, or panic in the former
s4 implementation.

Andrew Bartlett

1 files changed, 37 insertions, 18 deletions

diff --git a/source4/param/loadparm.c b/source4/param/loadparm.c
index 0f60e4364b..fa00beee96 100644
--- a/source4/param/loadparm.c
+++ b/source4/param/loadparm.c
@@ -779,6 +779,7 @@ const char *lpcfg_get_parametric(struct loadparm_context *lp_ctx,
 			      struct loadparm_service *service,
 			      const char *type, const char *option)
 {
+	char *vfskey_tmp = NULL;
 	char *vfskey = NULL;
 	struct parmlist_entry *data;
 
@@ -787,13 +788,14 @@ const char *lpcfg_get_parametric(struct loadparm_context *lp_ctx,
 
 	data = (service == NULL ? lp_ctx->globals->param_opt : service->param_opt);
 
-	asprintf(&vfskey, "%s:%s", type, option);
-	if (vfskey == NULL) return NULL;
-	strlower(vfskey);
+	vfskey_tmp = talloc_asprintf(NULL, "%s:%s", type, option);
+	if (vfskey_tmp == NULL) return NULL;
+	vfskey = strlower_talloc(NULL, vfskey_tmp);
+	talloc_free(vfskey_tmp);
 
 	while (data) {
 		if (strcmp(data->key, vfskey) == 0) {
-			free(vfskey);
+			talloc_free(vfskey);
 			return data->value;
 		}
 		data = data->next;
@@ -805,13 +807,13 @@ const char *lpcfg_get_parametric(struct loadparm_context *lp_ctx,
 		for (data = lp_ctx->globals->param_opt; data;
 		     data = data->next) {
 			if (strcmp(data->key, vfskey) == 0) {
-				free(vfskey);
+				talloc_free(vfskey);
 				return data->value;
 			}
 		}
 	}
 
-	free(vfskey);
+	talloc_free(vfskey);
 
 	return NULL;
 }
@@ -1031,7 +1033,27 @@ static bool string_set(TALLOC_CTX *mem_ctx, char **dest, const char *src)
 
 	*dest = talloc_strdup(mem_ctx, src);
 	if ((*dest) == NULL) {
-		DEBUG(0,("Out of memory in string_init\n"));
+		DEBUG(0,("Out of memory in string_set\n"));
+		return false;
+	}
+
+	return true;
+}
+
+/**
+ * Set a string value, deallocating any existing space, and allocing the space
+ * for the string
+ */
+static bool string_set_upper(TALLOC_CTX *mem_ctx, char **dest, const char *src)
+{
+	talloc_free(*dest);
+
+	if (src == NULL)
+		src = "";
+
+	*dest = strupper_talloc(mem_ctx, src);
+	if ((*dest) == NULL) {
+		DEBUG(0,("Out of memory in string_set_upper\n"));
 		return false;
 	}
 
@@ -1292,10 +1314,9 @@ static void copy_service(struct loadparm_service *pserviceDest,
 					break;
 
 				case P_USTRING:
-					string_set(pserviceDest,
-						   (char **)dest_ptr,
-						   *(char **)src_ptr);
-					strupper(*(char **)dest_ptr);
+					string_set_upper(pserviceDest,
+							 (char **)dest_ptr,
+							 *(char **)src_ptr);
 					break;
 				case P_LIST:
 					*(const char ***)dest_ptr = (const char **)str_list_copy(pserviceDest, 
@@ -1574,11 +1595,9 @@ static bool lp_do_parameter_parametric(struct loadparm_context *lp_ctx,
 		pszParmName++;
 	}
 
-	name = strdup(pszParmName);
+	name = strlower_talloc(lp_ctx, pszParmName);
 	if (!name) return false;
 
-	strlower(name);
-
 	if (service == NULL) {
 		data = lp_ctx->globals->param_opt;
 		mem_ctx = lp_ctx->globals;
@@ -1594,13 +1613,14 @@ static bool lp_do_parameter_parametric(struct loadparm_context *lp_ctx,
 		if (strcmp(paramo->key, name) == 0) {
 			if ((paramo->priority & FLAG_CMDLINE) &&
 			    !(flags & FLAG_CMDLINE)) {
+				talloc_free(name);
 				return true;
 			}
 
 			talloc_free(paramo->value);
 			paramo->value = talloc_strdup(paramo, pszParmValue);
 			paramo->priority = flags;
-			free(name);
+			talloc_free(name);
 			return true;
 		}
 	}
@@ -1617,7 +1637,7 @@ static bool lp_do_parameter_parametric(struct loadparm_context *lp_ctx,
 		DLIST_ADD(service->param_opt, paramo);
 	}
 
-	free(name);
+	talloc_free(name);
 
 	return true;
 }
@@ -1713,8 +1733,7 @@ static bool set_variable(TALLOC_CTX *mem_ctx, int parmnum, void *parm_ptr,
 			break;
 
 		case P_USTRING:
-			string_set(mem_ctx, (char **)parm_ptr, pszParmValue);
-			strupper(*(char **)parm_ptr);
+			string_set_upper(mem_ctx, (char **)parm_ptr, pszParmValue);
 			break;
 
 		case P_ENUM: