From 9bb94d81206b4980f5c547c07dfdf7a912b73f7b Mon Sep 17 00:00:00 2001
From: Omar Sandoval <osandov@fb.com>
Date: Tue, 22 May 2018 15:44:01 -0700
Subject: Btrfs: fix memory and mount leak in btrfs_ioctl_rm_dev_v2()

commit fd4e994bd1f9dc9628e168a7f619bf69f6984635 upstream.

If we have invalid flags set, when we error out we must drop our writer
counter and free the buffer we allocated for the arguments. This bug is
trivially reproduced with the following program on 4.7+:

	#include <fcntl.h>
	#include <stdint.h>
	#include <stdio.h>
	#include <stdlib.h>
	#include <unistd.h>
	#include <sys/ioctl.h>
	#include <sys/stat.h>
	#include <sys/types.h>
	#include <linux/btrfs.h>
	#include <linux/btrfs_tree.h>

	int main(int argc, char **argv)
	{
		struct btrfs_ioctl_vol_args_v2 vol_args = {
			.flags = UINT64_MAX,
		};
		int ret;
		int fd;

		if (argc != 2) {
			fprintf(stderr, "usage: %s PATH\n", argv[0]);
			return EXIT_FAILURE;
		}

		fd = open(argv[1], O_WRONLY);
		if (fd == -1) {
			perror("open");
			return EXIT_FAILURE;
		}

		ret = ioctl(fd, BTRFS_IOC_RM_DEV_V2, &vol_args);
		if (ret == -1)
			perror("ioctl");

		close(fd);
		return EXIT_SUCCESS;
	}

When unmounting the filesystem, we'll hit the
WARN_ON(mnt_get_writers(mnt)) in cleanup_mnt() and also may prevent the
filesystem to be remounted read-only as the writer count will stay
lifted.

Fixes: 6b526ed70cf1 ("btrfs: introduce device delete by devid")
CC: stable@vger.kernel.org # 4.9+
Signed-off-by: Omar Sandoval <osandov@fb.com>
Reviewed-by: Su Yue <suy.fnst@cn.fujitsu.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 fs/btrfs/ioctl.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

(limited to 'fs')

diff --git a/fs/btrfs/ioctl.c b/fs/btrfs/ioctl.c
index 9ac8f3ded704..cbf512b64597 100644
--- a/fs/btrfs/ioctl.c
+++ b/fs/btrfs/ioctl.c
@@ -2708,8 +2708,10 @@ static long btrfs_ioctl_rm_dev_v2(struct file *file, void __user *arg)
 	}
 
 	/* Check for compatibility reject unknown flags */
-	if (vol_args->flags & ~BTRFS_VOL_ARG_V2_FLAGS_SUPPORTED)
-		return -EOPNOTSUPP;
+	if (vol_args->flags & ~BTRFS_VOL_ARG_V2_FLAGS_SUPPORTED) {
+		ret = -EOPNOTSUPP;
+		goto out;
+	}
 
 	if (atomic_xchg(&root->fs_info->mutually_exclusive_operation_running,
 			1)) {
-- 
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