linux-hardening - [PATCH] exec: Simplify remove_arg

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Date: Sat,  9 Mar 2024 13:48:30 -0800
From: Kees Cook <keescook@...omium.org>
To: Eric Biederman <ebiederm@...ssion.com>
Cc: Kees Cook <keescook@...omium.org>,
	Alexander Viro <viro@...iv.linux.org.uk>,
	Christian Brauner <brauner@...nel.org>,
	Jan Kara <jack@...e.cz>,
	linux-mm@...ck.org,
	linux-fsdevel@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	linux-hardening@...r.kernel.org
Subject: [PATCH] exec: Simplify remove_arg_zero() error path

We don't need the "out" label any more, so remove "ret" and return
directly on error.

Signed-off-by: Kees Cook <keescook@...omium.org>
---
Cc: Eric Biederman <ebiederm@...ssion.com>
Cc: Alexander Viro <viro@...iv.linux.org.uk>
Cc: Christian Brauner <brauner@...nel.org>
Cc: Jan Kara <jack@...e.cz>
Cc: linux-mm@...ck.org
Cc: linux-fsdevel@...r.kernel.org
---
 fs/exec.c | 10 +++-------
 1 file changed, 3 insertions(+), 7 deletions(-)

diff --git a/fs/exec.c b/fs/exec.c
index 715e1a8aa4f0..e7d9d6ad980b 100644
--- a/fs/exec.c
+++ b/fs/exec.c
@@ -1720,7 +1720,6 @@ static int prepare_binprm(struct linux_binprm *bprm)
  */
 int remove_arg_zero(struct linux_binprm *bprm)
 {
-	int ret = 0;
 	unsigned long offset;
 	char *kaddr;
 	struct page *page;
@@ -1731,10 +1730,8 @@ int remove_arg_zero(struct linux_binprm *bprm)
 	do {
 		offset = bprm->p & ~PAGE_MASK;
 		page = get_arg_page(bprm, bprm->p, 0);
-		if (!page) {
-			ret = -EFAULT;
-			goto out;
-		}
+		if (!page)
+			return -EFAULT;
 		kaddr = kmap_local_page(page);
 
 		for (; offset < PAGE_SIZE && kaddr[offset];
@@ -1748,8 +1745,7 @@ int remove_arg_zero(struct linux_binprm *bprm)
 	bprm->p++;
 	bprm->argc--;
 
-out:
-	return ret;
+	return 0;
 }
 EXPORT_SYMBOL(remove_arg_zero);
 
-- 
2.34.1