From: Toke Høiland-Jørgensen <toke@xxxxxxxxxx>
Date: Wed, 30 Oct 2024 11:48:26 +0100
> The test_run code detects whether a page has been modified and
> re-initialises the xdp_frame structure if it has, using
> xdp_update_frame_from_buff(). However, xdp_update_frame_from_buff()
> doesn't touch frame->mem, so that wasn't correctly re-initialised, which
> led to the pages from page_pool not being returned correctly. Syzbot
> noticed this as a memory leak.
>
> Fix this by also copying the frame->mem structure when re-initialising
> the frame, like we do on initialisation of a new page from page_pool.
>
> Reported-by: syzbot+d121e098da06af416d23@xxxxxxxxxxxxxxxxxxxxxxxxx
> Tested-by: syzbot+d121e098da06af416d23@xxxxxxxxxxxxxxxxxxxxxxxxx
> Fixes: e5995bc7e2ba ("bpf, test_run: fix crashes due to XDP frame overwriting/corruption")
> Fixes: b530e9e1063e ("bpf: Add "live packet" mode for XDP in BPF_PROG_RUN")
> Signed-off-by: Toke Høiland-Jørgensen <toke@xxxxxxxxxx>
Reviewed-by: Alexander Lobakin <aleksander.lobakin@xxxxxxxxx>
Thanks,
Olek
