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ASoC: wm_adsp: Fix theoretical NULL pointer for alg_region 

Fix potential NULL pointer dereference for alg_region in
wm_adsp_buffer_parse_legacy. In practice this can never happen as
loading the firmware should have failed at the wm_adsp2_setup_algs
stage, however probably better for the code to be robust against
future changes and this is more helpful for static analysis.

Signed-off-by: Li Xu <li.xu@cirrus.com>
Signed-off-by: Charles Keepax <ckeepax@opensource.cirrus.com>
Link: https://lore.kernel.org/r/20191001130911.19238-1-ckeepax@opensource.cirrus.com
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Li Xu 2019-10-01 14:09:11 +01:00 committed by Mark Brown
parent 4bb41984bf
commit 9daf4fd030
No known key found for this signature in database
GPG Key ID: 24D68B725D5487D0
1 changed files with 6 additions and 1 deletions
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7
sound/soc/codecs/wm_adsp.c
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@ -3697,11 +3697,16 @@ static int wm_adsp_buffer_parse_legacy(struct wm_adsp *dsp)
u32 xmalg, addr, magic;
int i, ret;
alg_region = wm_adsp_find_alg_region(dsp, WMFW_ADSP2_XM, dsp->fw_id);
if (!alg_region) {
adsp_err(dsp, "No algorithm region found\n");
return -EINVAL;
}
buf = wm_adsp_buffer_alloc(dsp);
if (!buf)
return -ENOMEM;
alg_region = wm_adsp_find_alg_region(dsp, WMFW_ADSP2_XM, dsp->fw_id);
xmalg = dsp->ops->sys_config_size / sizeof(__be32);
addr = alg_region->base + xmalg + ALG_XM_FIELD(magic);