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ALSA: isa/wavefront: prevent out of bounds write in ioctl 

[ 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@oracle.com>
Link: https://lore.kernel.org/r/20200501094011.GA960082@mwanda
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Dan Carpenter 2020-05-01 12:40:11 +03:00 committed by Greg Kroah-Hartman
parent d013955da9
commit cd202586d1
1 changed files with 7 additions and 1 deletions
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8
sound/isa/wavefront/wavefront_synth.c
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@ -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;