No need to cast malloc() return value.

lib/util/alloc.c

@@ -197,7 +197,7 @@ sudo_estrdup_v1(const char *src)
 
     if (src != NULL) {
 	len = strlen(src);
-	dst = (char *) sudo_emalloc(len + 1);
+	dst = sudo_emalloc(len + 1);
 	(void) memcpy(dst, src, len);
 	dst[len] = '\0';
     }
@@ -219,7 +219,7 @@ sudo_estrndup_v1(const char *src, size_t maxlen)
 	    len++;
 	    maxlen--;
 	}
-	dst = (char *) sudo_emalloc(len + 1);
+	dst = sudo_emalloc(len + 1);
 	(void) memcpy(dst, src, len);
 	dst[len] = '\0';
     }

lib/util/snprintf.c

@@ -370,7 +370,7 @@ xxxprintf(char **strp, size_t strsize, int alloc, const char *fmt0, va_list ap)
 		if (alloc && str >= estr) { \
 			char *t; \
 			strsize = (strsize << 1) + 1; \
-			if (!(t = (char *)realloc(*strp, strsize))) { \
+			if (!(t = realloc(*strp, strsize))) { \
 				free(str); \
 				*strp = NULL; \
 				ret = -1; \

plugins/sample/sample_plugin.c

@@ -286,7 +286,7 @@ find_editor(int nfiles, char * const files[], char **argv_out[])
     }
     if (editor_path != editor)
 	free(editor);
-    nargv = (char **) malloc((nargc + 1 + nfiles + 1) * sizeof(char *));
+    nargv = malloc((nargc + 1 + nfiles + 1) * sizeof(char *));
     if (nargv == NULL) {
 	sudo_log(SUDO_CONV_ERROR_MSG, "unable to allocate memory\n");
 	free(editor_path);

plugins/sudoers/auth/rfc1938.c

@@ -110,7 +110,7 @@ sudo_rfc1938_setup(struct passwd *pw, char **promptp, sudo_auth *auth)
     /* Get space for new prompt with embedded challenge */
     if (np_size < op_len + strlen(challenge) + 7) {
 	np_size = op_len + strlen(challenge) + 7;
-	new_prompt = (char *) sudo_erealloc(new_prompt, np_size);
+	new_prompt = sudo_erealloc(new_prompt, np_size);
     }
 
     if (def_long_otp_prompt)

plugins/sudoers/redblack.c

@@ -90,7 +90,7 @@ rbcreate(int (*compar)(const void *, const void*))
     struct rbtree *tree;
     debug_decl(rbcreate, SUDOERS_DEBUG_RBTREE)
 
-    tree = (struct rbtree *) sudo_emalloc(sizeof(*tree));
+    tree = sudo_emalloc(sizeof(*tree));
     tree->compar = compar;
 
     /*
@@ -185,7 +185,7 @@ rbinsert(struct rbtree *tree, void *data)
 	node = res < 0 ? node->left : node->right;
     }
 
-    node = (struct rbnode *) sudo_emalloc(sizeof(*node));
+    node = sudo_emalloc(sizeof(*node));
     node->data = data;
     node->left = node->right = rbnil(tree);
     node->parent = parent;

plugins/sudoers/testsudoers.c

@@ -236,7 +236,7 @@ main(int argc, char *argv[])
 	for (size = 0, from = argv; *from; from++)
 	    size += strlen(*from) + 1;
 
-	user_args = (char *) sudo_emalloc(size);
+	user_args = sudo_emalloc(size);
 	for (to = user_args, from = argv; *from; from++) {
 	    n = strlcpy(to, *from, size - (to - user_args));
 	    if (n >= size - (to - user_args))

plugins/sudoers/toke_util.c

@@ -116,7 +116,7 @@ fill_cmnd(const char *src, int len)
 
     arg_len = arg_size = 0;
 
-    dst = sudoerslval.command.cmnd = (char *) malloc(len + 1);
+    dst = sudoerslval.command.cmnd = malloc(len + 1);
     if (sudoerslval.command.cmnd == NULL) {
 	sudo_warn(NULL);
 	sudoerserror(NULL);
@@ -155,8 +155,7 @@ fill_args(const char *s, int len, int addspace)
 	    ;
 
 	p = sudoerslval.command.args ?
-	    (char *) realloc(sudoerslval.command.args, arg_size) :
-	    (char *) malloc(arg_size);
+	    realloc(sudoerslval.command.args, arg_size) : malloc(arg_size);
 	if (p == NULL) {
 	    sudo_efree(sudoerslval.command.args);
 	    sudo_warn(NULL);