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btrfs: sync ioctl, handle errors after transaction start

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The version merged to 3.19 did not handle errors from start_trancaction
and could pass an invalid pointer to commit_transaction.

Fixes: 6b5fe46dfa ("btrfs: do commit in sync_fs if there are pending changes")
Reported-by: Filipe Manana <fdmanana@suse.com>
Signed-off-by: David Sterba <dsterba@suse.cz>
Signed-off-by: Chris Mason <clm@fb.com>
This commit is contained in:
David Sterba 2015-01-19 14:21:02 +01:00 committed by Chris Mason
parent 6f8960541b
commit 98bd5c547e
1 changed files with 2 additions and 2 deletions
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4
fs/btrfs/super.c
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@ -1001,9 +1001,9 @@ int btrfs_sync_fs(struct super_block *sb, int wait)
if (fs_info->pending_changes == 0)
return 0;
trans = btrfs_start_transaction(root, 0);
} else {
return PTR_ERR(trans);
}
if (IS_ERR(trans))
return PTR_ERR(trans);
}
return btrfs_commit_transaction(trans, root);
}