Re: [STABLE 6.6.y] ovl: fix memory leak in ovl_parse_param()

[Greg KH <gregkh@linuxfoundation.org>]

On Tue, Apr 30, 2024 at 11:48:54AM +0800, Jingbo Xu wrote:
> From: Amir Goldstein <amir73il@gmail.com>
> 
> commit 37f32f52643869131ec01bb69bdf9f404f6109fb upstream.
> 
> On failure to parse parameters in ovl_parse_param_lowerdir(), it is
> necessary to update ctx->nr with the correct nr before using
> ovl_reset_lowerdirs() to release l->name.
> 
> Reported-and-tested-by: syzbot+26eedf3631650972f17c@syzkaller.appspotmail.com
> Fixes: c835110b588a ("ovl: remove unused code in lowerdir param parsing")
> Co-authored-by: Edward Adam Davis <eadavis@qq.com>
> Signed-off-by: Amir Goldstein <amir73il@gmail.com>
> Signed-off-by: Jingbo Xu <jefflexu@linux.alibaba.com>
> ---
> Commit c835110b588a ("ovl: remove unused code in lowerdir param
> parsing") was back ported to 6.6.y as a "Stable-dep-of" of commit
> 2824083db76c ("ovl: Always reject mounting over case-insensitive
> directories"), while omitting the fix for commit c835110b588a itself.
> Maybe that is because by the time commit 37f32f526438 (the fix) is merged
> into master branch, commit c835110b588a has not been back ported to 6.6.y
> yet.

Now queued up, thanks.

greg k-h