Hi Cengiz,
Em Mon, 30 Nov 2020 12:28:26 +0300
Cengiz Can <cen...@kernel.wtf> escreveu:
> `vidtv_channel_si_destroy` function has a call to
> `vidtv_psi_pat_table_destroy` that frees Program Association Table.
>
> However it is followed by a loop that iterates over the count of Program
> Map Tables. This obviously accesses an invalid memory.
>
> Eliminate this by making a copy of num_pmt before free'ing Program
> Association Table and loop on it instead.
>
> Signed-off-by: Cengiz Can <cen...@kernel.wtf>
Collin sent me a similar fix. I'm applying his because:
- it was sent first;
- it uses a better approach: it just moves the
vidtv_psi_pat_table_destroy() call to happen after freeing
the PMT tables. So, it doesn't need an aux var.
Regards,
Mauro
> ---
> drivers/media/test-drivers/vidtv/vidtv_channel.c | 5 ++++-
> 1 file changed, 4 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/media/test-drivers/vidtv/vidtv_channel.c
> b/drivers/media/test-drivers/vidtv/vidtv_channel.c
> index 8ad6c0744d36..4af39a8786a7 100644
> --- a/drivers/media/test-drivers/vidtv/vidtv_channel.c
> +++ b/drivers/media/test-drivers/vidtv/vidtv_channel.c
> @@ -503,10 +503,13 @@ int vidtv_channel_si_init(struct vidtv_mux *m)
> void vidtv_channel_si_destroy(struct vidtv_mux *m)
> {
> u32 i;
> + u16 num_pmt;
> +
> + num_pmt = m->si.pat->num_pmt;
>
> vidtv_psi_pat_table_destroy(m->si.pat);
>
> - for (i = 0; i < m->si.pat->num_pmt; ++i)
> + for (i = 0; i < num_pmt; ++i)
> vidtv_psi_pmt_table_destroy(m->si.pmt_secs[i]);
>
> kfree(m->si.pmt_secs);
Thanks,
Mauro
