Merge pull request #18616 from keszybz/argv-fuzzer-quick-fix

fuzz-systemctl-parse-argv: avoid "leak" of bus object

src/basic/capability-util.c

@@ -18,7 +18,7 @@
 #include "util.h"
 
 int have_effective_cap(int value) {
-        _cleanup_cap_free_ cap_t cap;
+        _cleanup_cap_free_ cap_t cap = NULL;
         cap_flag_value_t fv;
 
         cap = cap_get_proc();

src/basic/capability-util.h

@@ -25,7 +25,7 @@ int drop_privileges(uid_t uid, gid_t gid, uint64_t keep_capabilities);
 
 int drop_capability(cap_value_t cv);
 
-DEFINE_TRIVIAL_CLEANUP_FUNC(cap_t, cap_free);
+DEFINE_TRIVIAL_CLEANUP_FUNC_FULL(cap_t, cap_free, NULL);
 #define _cleanup_cap_free_ _cleanup_(cap_freep)
 
 static inline void cap_free_charpp(char **p) {

src/basic/dlfcn-util.h

@@ -5,7 +5,7 @@
 
 #include "macro.h"
 
-DEFINE_TRIVIAL_CLEANUP_FUNC(void*, dlclose);
+DEFINE_TRIVIAL_CLEANUP_FUNC_FULL(void*, dlclose, NULL);
 
 int dlsym_many_and_warn(void *dl, int level, ...);
 

src/basic/fd-util.h

@@ -41,8 +41,8 @@ static inline void fclosep(FILE **f) {
         safe_fclose(*f);
 }
 
-DEFINE_TRIVIAL_CLEANUP_FUNC(FILE*, pclose);
-DEFINE_TRIVIAL_CLEANUP_FUNC(DIR*, closedir);
+DEFINE_TRIVIAL_CLEANUP_FUNC_FULL(FILE*, pclose, NULL);
+DEFINE_TRIVIAL_CLEANUP_FUNC_FULL(DIR*, closedir, NULL);
 
 #define _cleanup_close_ _cleanup_(closep)
 #define _cleanup_fclose_ _cleanup_(fclosep)

src/basic/fileio.c

@@ -1146,7 +1146,7 @@ static EndOfLineMarker categorize_eol(char c, ReadLineFlags flags) {
         return EOL_NONE;
 }
 
-DEFINE_TRIVIAL_CLEANUP_FUNC(FILE*, funlockfile);
+DEFINE_TRIVIAL_CLEANUP_FUNC_FULL(FILE*, funlockfile, NULL);
 
 int read_line_full(FILE *f, size_t limit, ReadLineFlags flags, char **ret) {
         size_t n = 0, allocated = 0, count = 0;

src/basic/gcrypt-util.h

@@ -14,7 +14,7 @@
 void initialize_libgcrypt(bool secmem);
 int string_hashsum(const char *s, size_t len, int md_algorithm, char **out);
 
-DEFINE_TRIVIAL_CLEANUP_FUNC(gcry_md_hd_t, gcry_md_close);
+DEFINE_TRIVIAL_CLEANUP_FUNC_FULL(gcry_md_hd_t, gcry_md_close, NULL);
 #endif
 
 static inline int string_hashsum_sha224(const char *s, size_t len, char **out) {

src/basic/macro.h

@@ -405,10 +405,20 @@ static inline int __coverity_check_and_return__(int condition) {
                 func(p);                                        \
         }
 
+/* When func() returns the void value (NULL, -1, …) of the appropriate type */
 #define DEFINE_TRIVIAL_CLEANUP_FUNC(type, func)                 \
         static inline void func##p(type *p) {                   \
                 if (*p)                                         \
+                        *p = func(*p);                          \
+        }
+
+/* When func() doesn't return the appropriate type, set variable to empty afterwards */
+#define DEFINE_TRIVIAL_CLEANUP_FUNC_FULL(type, func, empty)     \
+        static inline void func##p(type *p) {                   \
+                if (*p != (empty)) {                            \
                         func(*p);                               \
+                        *p = (empty);                           \
+                }                                               \
         }
 
 #define _DEFINE_TRIVIAL_REF_FUNC(type, name, scope)             \

src/basic/selinux-util.c

@@ -29,7 +29,7 @@
 #include "time-util.h"
 
 #if HAVE_SELINUX
-DEFINE_TRIVIAL_CLEANUP_FUNC(context_t, context_free);
+DEFINE_TRIVIAL_CLEANUP_FUNC_FULL(context_t, context_free, NULL);
 #define _cleanup_context_free_ _cleanup_(context_freep)
 
 static int mac_selinux_reload(int seqno);

src/basic/selinux-util.h

@@ -11,7 +11,7 @@
 #if HAVE_SELINUX
 #include <selinux/selinux.h>
 
-DEFINE_TRIVIAL_CLEANUP_FUNC(char*, freecon);
+DEFINE_TRIVIAL_CLEANUP_FUNC_FULL(char*, freecon, NULL);
 #define _cleanup_freecon_ _cleanup_(freeconp)
 #endif
 

src/basic/strbuf.c

@@ -26,7 +26,7 @@
  *   ...
  */
 
-struct strbuf *strbuf_new(void) {
+struct strbuf* strbuf_new(void) {
         struct strbuf *str;
 
         str = new(struct strbuf, 1);
@@ -65,13 +65,13 @@ void strbuf_complete(struct strbuf *str) {
 }
 
 /* clean up everything */
-void strbuf_cleanup(struct strbuf *str) {
+struct strbuf* strbuf_free(struct strbuf *str) {
         if (!str)
-                return;
+                return NULL;
 
         strbuf_complete(str);
         free(str->buf);
-        free(str);
+        return mfree(str);
 }
 
 static int strbuf_children_cmp(const struct strbuf_child_entry *n1,

src/basic/strbuf.h

@@ -32,8 +32,8 @@ struct strbuf_child_entry {
         struct strbuf_node *child;
 };
 
-struct strbuf *strbuf_new(void);
+struct strbuf* strbuf_new(void);
 ssize_t strbuf_add_string(struct strbuf *str, const char *s, size_t len);
 void strbuf_complete(struct strbuf *str);
-void strbuf_cleanup(struct strbuf *str);
-DEFINE_TRIVIAL_CLEANUP_FUNC(struct strbuf*, strbuf_cleanup);
+struct strbuf* strbuf_free(struct strbuf *str);
+DEFINE_TRIVIAL_CLEANUP_FUNC(struct strbuf*, strbuf_free);