Thread (140 messages) 140 messages, 5 authors, 2020-06-30

[PATCH 4.4 005/135] ALSA: isa/wavefront: prevent out of bounds write in ioctl

From: Sasha Levin <sashal@kernel.org>
Date: 2020-06-29 19:13:08
Also in: lkml
Subsystem: sound, the rest · Maintainers: Jaroslav Kysela, Takashi Iwai, Linus Torvalds

From: Dan Carpenter <redacted>

[ 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 <redacted>
Link: https://lore.kernel.org/r/20200501094011.GA960082@mwanda (local)
Signed-off-by: Takashi Iwai <redacted>
Signed-off-by: Sasha Levin <sashal@kernel.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 718d5e3b7806f..6c06d06457796 100644
--- a/sound/isa/wavefront/wavefront_synth.c
+++ b/sound/isa/wavefront/wavefront_synth.c
@@ -1174,7 +1174,10 @@ 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),
@@ -1205,6 +1208,9 @@ 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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