Re: [PATCH] ALSA: hda/hdmi: clamp sad_count in ELD proc write handler

[Takashi Iwai <tiwai@suse.de>]

On Thu, 08 Oct 2026 10:51:33 +0200,
Peter Ujfalusi wrote:
> 
> snd_hdmi_write_eld_info() parses a "sad_count N" line from the
> root-writable ELD proc interface and assigns N directly to
> e->sad_count with no upper bound, unlike the per-index "sadN_*" lines
> a few lines below which are already bounded to ELD_MAX_SAD.
> 
> snd_hdmi_eld_update_pcm_info() later iterates
> "for (i = 0; i < e->sad_count; i++)" over the fixed
> e->sad[ELD_MAX_SAD] array, so an oversized sad_count read from the
> proc file causes it to walk past the array.
> 
> Reject sad_count values above ELD_MAX_SAD, matching the existing
> per-index guard.
> 
> Fixes: acb059938810 ("ALSA: hda - ELD proc interface write updates")
> Cc: stable@vger.kernel.org
> Signed-off-by: Peter Ujfalusi <peter.ujfalusi@linux.intel.com>

Applied to for-next branch.  Thanks.


Takashi