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Message-Id: <20200618012218.607130-15-sashal@kernel.org>
Date: Wed, 17 Jun 2020 21:19:41 -0400
From: Sasha Levin <sashal@...nel.org>
To: linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc: Dan Carpenter <dan.carpenter@...cle.com>,
Takashi Iwai <tiwai@...e.de>, Sasha Levin <sashal@...nel.org>,
alsa-devel@...a-project.org
Subject: [PATCH AUTOSEL 4.19 015/172] ALSA: isa/wavefront: prevent out of bounds write in ioctl
From: Dan Carpenter <dan.carpenter@...cle.com>
[ Upstream commit 7f0d5053c5a9d23fe5c2d337495a9d79038d267b ]
The "header->number" comes from the ioctl and it needs to be clamped to
prevent out of bounds writes.
Signed-off-by: Dan Carpenter <dan.carpenter@...cle.com>
Link: https://lore.kernel.org/r/20200501094011.GA960082@mwanda
Signed-off-by: Takashi Iwai <tiwai@...e.de>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
sound/isa/wavefront/wavefront_synth.c | 8 +++++++-
1 file changed, 7 insertions(+), 1 deletion(-)
diff --git a/sound/isa/wavefront/wavefront_synth.c b/sound/isa/wavefront/wavefront_synth.c
index 0b1e4b34b299..13c8e6542a2f 100644
--- a/sound/isa/wavefront/wavefront_synth.c
+++ b/sound/isa/wavefront/wavefront_synth.c
@@ -1175,7 +1175,10 @@ wavefront_send_alias (snd_wavefront_t *dev, wavefront_patch_info *header)
"alias for %d\n",
header->number,
header->hdr.a.OriginalSample);
-
+
+ if (header->number >= WF_MAX_SAMPLE)
+ return -EINVAL;
+
munge_int32 (header->number, &alias_hdr[0], 2);
munge_int32 (header->hdr.a.OriginalSample, &alias_hdr[2], 2);
munge_int32 (*((unsigned int *)&header->hdr.a.sampleStartOffset),
@@ -1206,6 +1209,9 @@ wavefront_send_multisample (snd_wavefront_t *dev, wavefront_patch_info *header)
int num_samples;
unsigned char *msample_hdr;
+ if (header->number >= WF_MAX_SAMPLE)
+ return -EINVAL;
+
msample_hdr = kmalloc(WF_MSAMPLE_BYTES, GFP_KERNEL);
if (! msample_hdr)
return -ENOMEM;
--
2.25.1
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