linux-kernel - Re: bug list: range checking issues

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Date:	Tue, 16 Feb 2010 11:00:57 +0100
From:	Clemens Ladisch <clemens@...isch.de>
To:	Jaroslav Kysela <perex@...ex.cz>,
	Dan Carpenter <error27@...il.com>,
	kernel-janitors@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: bug list: range checking issues

Dan Carpenter wrote:
> sound/core/seq/oss/seq_oss_init.c +276 snd_seq_oss_open(102) error: buffer overflow 'client_table' 16 <= 16

False positive, probably because the source of the assignment is checked
for overflow:

195:	dp->index = i;
	if (i >= SNDRV_SEQ_OSS_MAX_CLIENTS) {
		...
		goto _error;
	...
276:	client_table[dp->index] = dp;

> sound/oss/sequencer.c +1638 compute_finetune(45) error: buffer overflow 'semitone_tuning' 24 <= 99

False positive; bend is at most 2399, so semitones is at most 23.
The "if (semitones > 99) semitones = 99;" check is completely bogus.

> sound/core/pcm_native.c +320 snd_pcm_hw_refine(159) warn: buffer overflow 'params->masks' 3 <= 10

This looks correct; the channels parameter is an interval, not a mask.

	if (!params->fifo_size) {
		if (snd_mask_min(&params->masks[SNDRV_PCM_HW_PARAM_FORMAT]) ==
		    snd_mask_max(&params->masks[SNDRV_PCM_HW_PARAM_FORMAT]) &&
		    snd_mask_min(&params->masks[SNDRV_PCM_HW_PARAM_CHANNELS]) ==
		    snd_mask_max(&params->masks[SNDRV_PCM_HW_PARAM_CHANNELS])) {

Jaroslav, I guess this should have been snd_interval_min/max?
And shouldn't the parameters be accessed with hw_param_mask/interval?


Regards,
Clemens
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