linux-kernel - [PATCH] io_uring: Fix filename leak in __io_openat

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Message-Id: <20251224143748.45491-1-activprithvi@gmail.com>
Date: Wed, 24 Dec 2025 20:07:48 +0530
From: Prithvi Tambewagh <activprithvi@...il.com>
To: syzbot+00e61c43eb5e4740438f@...kaller.appspotmail.com,
	brauner@...nel.org,
	jack@...e.cz,
	viro@...iv.linux.org.uk
Cc: linux-fsdevel@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	syzkaller-bugs@...glegroups.com,
	Prithvi Tambewagh <activprithvi@...il.com>
Subject: [PATCH] io_uring: Fix filename leak in __io_openat_prep

#syz test git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git b927546677c876e26eba308550207c2ddf812a43

Signed-off-by: Prithvi Tambewagh <activprithvi@...il.com>
---
 io_uring/openclose.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/io_uring/openclose.c b/io_uring/openclose.c
index bfeb91b31bba..fc190a3d8112 100644
--- a/io_uring/openclose.c
+++ b/io_uring/openclose.c
@@ -75,8 +75,11 @@ static int __io_openat_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe
 	}
 
 	open->file_slot = READ_ONCE(sqe->file_index);
-	if (open->file_slot && (open->how.flags & O_CLOEXEC))
+	if (open->file_slot && (open->how.flags & O_CLOEXEC)) {
+		putname(open->filename);
+		open->filename = NULL;
 		return -EINVAL;
+	}
 
 	open->nofile = rlimit(RLIMIT_NOFILE);
 	req->flags |= REQ_F_NEED_CLEANUP;

base-commit: b927546677c876e26eba308550207c2ddf812a43
-- 
2.34.1