This is a note to let you know that I've just added the patch titled
btrfs: add write protection to SET_FEATURES ioctl
to the 4.5-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
btrfs-add-write-protection-to-set_features-ioctl.patch
and it can be found in the queue-4.5 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 7ab19625a911f7568ec85302e3aa7a64186006c8 Mon Sep 17 00:00:00 2001
From: David Sterba <dsterba@xxxxxxx>
Date: Wed, 4 May 2016 11:32:00 +0200
Subject: btrfs: add write protection to SET_FEATURES ioctl
From: David Sterba <dsterba@xxxxxxx>
commit 7ab19625a911f7568ec85302e3aa7a64186006c8 upstream.
Perform the want_write check if we get far enough to do any writes.
Signed-off-by: David Sterba <dsterba@xxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
fs/btrfs/ioctl.c | 16 +++++++++++++---
1 file changed, 13 insertions(+), 3 deletions(-)
--- a/fs/btrfs/ioctl.c
+++ b/fs/btrfs/ioctl.c
@@ -5397,9 +5397,15 @@ static int btrfs_ioctl_set_features(stru
if (ret)
return ret;
+ ret = mnt_want_write_file(file);
+ if (ret)
+ return ret;
+
trans = btrfs_start_transaction(root, 0);
- if (IS_ERR(trans))
- return PTR_ERR(trans);
+ if (IS_ERR(trans)) {
+ ret = PTR_ERR(trans);
+ goto out_drop_write;
+ }
spin_lock(&root->fs_info->super_lock);
newflags = btrfs_super_compat_flags(super_block);
@@ -5418,7 +5424,11 @@ static int btrfs_ioctl_set_features(stru
btrfs_set_super_incompat_flags(super_block, newflags);
spin_unlock(&root->fs_info->super_lock);
- return btrfs_commit_transaction(trans, root);
+ ret = btrfs_commit_transaction(trans, root);
+out_drop_write:
+ mnt_drop_write_file(file);
+
+ return ret;
}
long btrfs_ioctl(struct file *file, unsigned int
Patches currently in stable-queue which might be from dsterba@xxxxxxx are
queue-4.5/btrfs-add-read-only-check-to-sysfs-handler-of-features.patch
queue-4.5/btrfs-add-write-protection-to-set_features-ioctl.patch
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