linux-kernel - [PATCH v2 1/2] autofs: fix missing fput for FSCONFIG_SET

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Message-Id: <20240731-fsconfig-fsparam_fd-fixes-v2-1-e7c472224417@cyphar.com>
Date: Wed, 31 Jul 2024 23:10:27 +1000
From: Aleksa Sarai <cyphar@...har.com>
To: Ian Kent <raven@...maw.net>, Bill O'Donnell <bodonnel@...hat.com>, 
 Christian Brauner <brauner@...nel.org>, Jan Harkes <jaharkes@...cmu.edu>, 
 coda@...cmu.edu, Eric Sandeen <sandeen@...hat.com>, 
 David Howells <dhowells@...hat.com>
Cc: autofs@...r.kernel.org, linux-kernel@...r.kernel.org, 
 codalist@...a.cs.cmu.edu, Aleksa Sarai <cyphar@...har.com>
Subject: [PATCH v2 1/2] autofs: fix missing fput for FSCONFIG_SET_FD

If you pass an fd using FSCONFIG_SET_FD, autofs_parse_fd() "steals" the
param->file and so the fs_context infrastructure will not do fput() for
us.

Fixes: e6ec453bd0f0 ("autofs: convert autofs to use the new mount api")
Signed-off-by: Aleksa Sarai <cyphar@...har.com>
---
 fs/autofs/inode.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/fs/autofs/inode.c b/fs/autofs/inode.c
index cf792d4de4f1..64faa6c51f60 100644
--- a/fs/autofs/inode.c
+++ b/fs/autofs/inode.c
@@ -172,8 +172,7 @@ static int autofs_parse_fd(struct fs_context *fc, struct autofs_sb_info *sbi,
 	ret = autofs_check_pipe(pipe);
 	if (ret < 0) {
 		errorf(fc, "Invalid/unusable pipe");
-		if (param->type != fs_value_is_file)
-			fput(pipe);
+		fput(pipe);
 		return -EBADF;
 	}
 

-- 
2.45.2