[Patch 3/9] fs/compat.c: fix resource leaks and wrong goto's

[WANG Cong <xiyou.wangcong@gmail.com>]

Use free_arg_pages() to free the pages allocated by copy_strings_kernel()
on failure. And fix some related wrong goto pathes.

Signed-off-by: WANG Cong <wangcong@zeuux.org>
Cc: Alexander Viro <viro@zeniv.linux.org.uk>

---
diff --git a/fs/compat.c b/fs/compat.c
index 332a869..7e836ff 100644
--- a/fs/compat.c
+++ b/fs/compat.c
@@ -1381,15 +1381,15 @@ int compat_do_execve(char * filename,
 
 	retval = security_bprm_alloc(bprm);
 	if (retval)
-		goto out;
+		goto out_mm;
 
 	retval = prepare_binprm(bprm);
 	if (retval < 0)
-		goto out;
+		goto out_sec;
 
 	retval = copy_strings_kernel(1, &bprm->filename, bprm);
 	if (retval < 0)
-		goto out;
+		goto out_sec;
 
 	bprm->exec = bprm->p;
 	retval = compat_copy_strings(bprm->envc, envp, bprm);
@@ -1403,6 +1403,7 @@ int compat_do_execve(char * filename,
 	retval = search_binary_handler(bprm, regs);
 	if (retval >= 0) {
 		/* execve success */
+		free_arg_pages(bprm);
 		security_bprm_free(bprm);
 		acct_update_integrals(current);
 		kfree(bprm);
@@ -1410,6 +1411,9 @@ int compat_do_execve(char * filename,
 	}
 
 out:
+	free_arg_pages(bprm);
+
+out_sec:
 	if (bprm->security)
 		security_bprm_free(bprm);