win32: avoid invalid free

In external_exists() in appletlib.c it's necessary to take a copy
of the pointer to the allocated variable path1 so it can be freed:
find_executable() will change its value.

1 files changed, 5 insertions, 3 deletions

diff --git a/libbb/appletlib.c b/libbb/appletlib.c
index ebf24066d..5b42a9091 100644
--- a/libbb/appletlib.c
+++ b/libbb/appletlib.c
@@ -280,10 +280,12 @@ int FAST_FUNC find_applet_by_name(const char *name)
 
 static int external_exists(const char *name, const char *path)
 {
-        char *path1 = xstrdup(path ?: getenv("PATH"));
-        char *ret = find_executable(name, &path1);
+        char *path0, *path1, *ret;
+
+        path0 = path1 = xstrdup(path ?: getenv("PATH"));
+        ret = find_executable(name, &path1);
         free(ret);
-        free(path1);
+        free(path0);
         return ret != NULL;
 }