linux-kernel - [patch] ALSA: isa/wavefront: prevent some out of bound writes

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Message-ID: <20160504062737.GI22064@mwanda>
Date:	Wed, 4 May 2016 09:27:37 +0300
From:	Dan Carpenter <dan.carpenter@...cle.com>
To:	Jaroslav Kysela <perex@...ex.cz>
Cc:	Takashi Iwai <tiwai@...e.com>, alsa-devel@...a-project.org,
	linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org
Subject: [patch] ALSA: isa/wavefront: prevent some out of bound writes

"header->number" can be up to USHRT_MAX and it comes from the ioctl so
it needs to be capped.

Signed-off-by: Dan Carpenter <dan.carpenter@...cle.com>

diff --git a/sound/isa/wavefront/wavefront_synth.c b/sound/isa/wavefront/wavefront_synth.c
index 69f76ff..718d5e3 100644
--- a/sound/isa/wavefront/wavefront_synth.c
+++ b/sound/isa/wavefront/wavefront_synth.c
@@ -785,6 +785,9 @@ wavefront_send_patch (snd_wavefront_t *dev, wavefront_patch_info *header)
 	DPRINT (WF_DEBUG_LOAD_PATCH, "downloading patch %d\n",
 				      header->number);
 
+	if (header->number >= ARRAY_SIZE(dev->patch_status))
+		return -EINVAL;
+
 	dev->patch_status[header->number] |= WF_SLOT_FILLED;
 
 	bptr = buf;
@@ -809,6 +812,9 @@ wavefront_send_program (snd_wavefront_t *dev, wavefront_patch_info *header)
 	DPRINT (WF_DEBUG_LOAD_PATCH, "downloading program %d\n",
 		header->number);
 
+	if (header->number >= ARRAY_SIZE(dev->prog_status))
+		return -EINVAL;
+
 	dev->prog_status[header->number] = WF_SLOT_USED;
 
 	/* XXX need to zero existing SLOT_USED bit for program_status[i]
@@ -898,6 +904,9 @@ wavefront_send_sample (snd_wavefront_t *dev,
 		header->number = x;
 	}
 
+	if (header->number >= WF_MAX_SAMPLE)
+		return -EINVAL;
+
 	if (header->size) {
 
 		/* XXX it's a debatable point whether or not RDONLY semantics