From: Takashi Iwai Date: Thu, 25 Aug 2005 17:51:47 +0000 (+0200) Subject: [ALSA] pcm - Fix zero-division in 32bit compat layer X-Git-Tag: v2.6.14-rc1~1029^2~6 X-Git-Url: https://err.no/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=7153a558ad598ff521f1d9430982e2a4a6865126;p=linux-2.6 [ALSA] pcm - Fix zero-division in 32bit compat layer PCM Midlevel Fixed zero-division bug in PCM 32bit compat layer. Signed-off-by: Takashi Iwai --- diff --git a/sound/core/pcm_compat.c b/sound/core/pcm_compat.c index eef94a15f5..4b6307df84 100644 --- a/sound/core/pcm_compat.c +++ b/sound/core/pcm_compat.c @@ -144,7 +144,7 @@ static int snd_pcm_ioctl_sw_params_compat(snd_pcm_substream_t *substream, err = snd_pcm_sw_params(substream, ¶ms); if (err < 0) return err; - if (put_user(boundary, &src->boundary)) + if (boundary && put_user(boundary, &src->boundary)) return -EFAULT; return err; } @@ -252,8 +252,11 @@ static int snd_pcm_ioctl_hw_params_compat(snd_pcm_substream_t *substream, goto error; } - if (! refine) - runtime->boundary = recalculate_boundary(runtime); + if (! refine) { + unsigned int new_boundary = recalculate_boundary(runtime); + if (new_boundary) + runtime->boundary = new_boundary; + } error: kfree(data); return err; @@ -408,6 +411,8 @@ static int snd_pcm_ioctl_sync_ptr_compat(snd_pcm_substream_t *substream, status = runtime->status; control = runtime->control; boundary = recalculate_boundary(runtime); + if (! boundary) + boundary = 0x7fffffff; snd_pcm_stream_lock_irq(substream); /* FIXME: we should consider the boundary for the sync from app */ if (!(sflags & SNDRV_PCM_SYNC_PTR_APPL))