Re: [syzbot] [usb?] KASAN: slab-use-after-free Read in ep_open

[Greg KH]

On Mon, Aug 17, 2026 at 02:14:17PM -0400, Alan Stern wrote:
> On Mon, Aug 17, 2026 at 09:38:02AM -0700, syzbot wrote:
> > Hello,
> > 
> > syzbot has tested the proposed patch and the reproducer did not trigger any issue:
> > 
> > Reported-by: syzbot+df9e891bf8ea586f846b@xxxxxxxxxxxxxxxxxxxxxxxxx
> > Tested-by: syzbot+df9e891bf8ea586f846b@xxxxxxxxxxxxxxxxxxxxxxxxx
> > 
> > Tested on:
> > 
> > commit:         8d3ae592 Linux 7.2
> > git tree:       git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/ v7.2
> > console output: https://syzkaller.appspot.com/x/log.txt?x=16a91a25580000
> > kernel config:  https://syzkaller.appspot.com/x/.config?x=c44651ea7dd2f307
> > dashboard link: https://syzkaller.appspot.com/bug?extid=df9e891bf8ea586f846b
> > compiler:       gcc (Debian 14.2.0-19) 14.2.0, GNU ld (GNU Binutils for Debian) 2.44
> > patch:          https://syzkaller.appspot.com/x/patch.diff?x=15790679580000
> > 
> > Note: testing is done by a robot and is best-effort only.
> 
> Greg:
> 
> Has this patch ever been queued?
> 
> https://lore.kernel.org/linux-usb/ee41fbfd-f368-4a06-95d6-ae9b4267fd82@xxxxxxxxxxxxxxx/

No because it looks like there are competing patches here as you point
out.

> Looks like you can add syzbot's Tested-by: tag, as well as my Acked-by:.
> 
> Note that a different patch to fix the same problem was submitted here:
> 
> https://lore.kernel.org/linux-usb/20260731230603.4637-1-kartikey406@xxxxxxxxx/
> 
> IMO the first patch above is superior.

So Aleksandr's patch should be applied and not Deepanshu's?

thanks,

greg k-h