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| author | Dan Carpenter <dan.carpenter@oracle.com> | 2018-12-21 12:06:58 +0300 |
|---|---|---|
| committer | Mark Brown <broonie@kernel.org> | 2019-01-03 16:32:57 +0000 |
| commit | 678e2b44c8e3fec3afc7202f1996a4500a50be93 (patch) | |
| tree | a189206cb58a46b267a11e2bc7b54d64721e6952 | |
| parent | a41d9dbf5dac5b6a1283ee8001f22807d18352ea (diff) | |
| download | blackbird-op-linux-678e2b44c8e3fec3afc7202f1996a4500a50be93.tar.gz blackbird-op-linux-678e2b44c8e3fec3afc7202f1996a4500a50be93.zip | |
ALSA: compress: prevent potential divide by zero bugs
The problem is seen in the q6asm_dai_compr_set_params() function:
ret = q6asm_map_memory_regions(dir, prtd->audio_client, prtd->phys,
(prtd->pcm_size / prtd->periods),
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
prtd->periods);
In this code prtd->pcm_size is the buffer_size and prtd->periods comes
from params->buffer.fragments. If we allow the number of fragments to
be zero then it results in a divide by zero bug. One possible fix would
be to use prtd->pcm_count directly instead of using the division to
re-calculate it. But I decided that it doesn't really make sense to
allow zero fragments.
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
| -rw-r--r-- | sound/core/compress_offload.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/sound/core/compress_offload.c b/sound/core/compress_offload.c index a5b09e75e787..f7d2b373da0a 100644 --- a/sound/core/compress_offload.c +++ b/sound/core/compress_offload.c @@ -541,7 +541,8 @@ static int snd_compress_check_input(struct snd_compr_params *params) { /* first let's check the buffer parameter's */ if (params->buffer.fragment_size == 0 || - params->buffer.fragments > INT_MAX / params->buffer.fragment_size) + params->buffer.fragments > INT_MAX / params->buffer.fragment_size || + params->buffer.fragments == 0) return -EINVAL; /* now codec parameters */ |
