oslib: do not call g_strdup from qemu_get_exec_dir

Just return the directory without requiring the caller to free it.
This also removes a bogus check for NULL in os_find_datadir and
module_load_one; g_strdup of a static variable cannot return NULL.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

3 files changed, 14 insertions, 13 deletions

diff --git a/util/module.c b/util/module.c
index 34772e7d87..9ffe83bb32 100644
--- a/util/module.c
+++ b/util/module.c
@@ -172,7 +172,6 @@ bool module_load_one(const char *prefix, const char *lib_name)
 
 #ifdef CONFIG_MODULES
     char *fname = NULL;
-    char *exec_dir;
 #ifdef CONFIG_MODULE_UPGRADES
     char *version_dir;
 #endif
@@ -199,13 +198,12 @@ bool module_load_one(const char *prefix, const char *lib_name)
         return true;
     }
 
-    exec_dir = qemu_get_exec_dir();
     search_dir = getenv("QEMU_MODULE_DIR");
     if (search_dir != NULL) {
         dirs[n_dirs++] = g_strdup_printf("%s", search_dir);
     }
     dirs[n_dirs++] = g_strdup_printf("%s", CONFIG_QEMU_MODDIR);
-    dirs[n_dirs++] = g_strdup_printf("%s", exec_dir ? : "");
+    dirs[n_dirs++] = g_strdup(qemu_get_exec_dir());
 
 #ifdef CONFIG_MODULE_UPGRADES
     version_dir = g_strcanon(g_strdup(QEMU_PKGVERSION),
@@ -216,9 +214,6 @@ bool module_load_one(const char *prefix, const char *lib_name)
 
     assert(n_dirs <= ARRAY_SIZE(dirs));
 
-    g_free(exec_dir);
-    exec_dir = NULL;
-
     for (i = 0; i < n_dirs; i++) {
         fname = g_strdup_printf("%s/%s%s",
                 dirs[i], module_name, CONFIG_HOST_DSOSUF);
diff --git a/util/oslib-posix.c b/util/oslib-posix.c
index f5f676f079..18531fc859 100644
--- a/util/oslib-posix.c
+++ b/util/oslib-posix.c
@@ -366,7 +366,9 @@ void qemu_init_exec_dir(const char *argv0)
     char *p = NULL;
     char buf[PATH_MAX];
 
-    assert(!exec_dir[0]);
+    if (exec_dir[0]) {
+        return;
+    }
 
 #if defined(__linux__)
     {
@@ -439,9 +441,9 @@ void qemu_init_exec_dir(const char *argv0)
     g_free(dir);
 }
 
-char *qemu_get_exec_dir(void)
+const char *qemu_get_exec_dir(void)
 {
-    return g_strdup(exec_dir);
+    return exec_dir;
 }
 
 static void sigbus_handler(int signal)
diff --git a/util/oslib-win32.c b/util/oslib-win32.c
index c654dafd93..1a33912944 100644
--- a/util/oslib-win32.c
+++ b/util/oslib-win32.c
@@ -315,7 +315,7 @@ void qemu_set_tty_echo(int fd, bool echo)
     }
 }
 
-static char exec_dir[PATH_MAX];
+static char *exec_dir;
 
 void qemu_init_exec_dir(const char *argv0)
 {
@@ -324,6 +324,10 @@ void qemu_init_exec_dir(const char *argv0)
     char buf[MAX_PATH];
     DWORD len;
 
+    if (exec_dir) {
+        return;
+    }
+
     len = GetModuleFileName(NULL, buf, sizeof(buf) - 1);
     if (len == 0) {
         return;
@@ -336,13 +340,13 @@ void qemu_init_exec_dir(const char *argv0)
     }
     *p = 0;
     if (access(buf, R_OK) == 0) {
-        pstrcpy(exec_dir, sizeof(exec_dir), buf);
+        exec_dir = g_strdup(buf);
     }
 }
 
-char *qemu_get_exec_dir(void)
+const char *qemu_get_exec_dir(void)
 {
-    return g_strdup(exec_dir);
+    return exec_dir;
 }
 
 #if !GLIB_CHECK_VERSION(2, 50, 0)