4.4-stable review patch. If anyone has any objections, please let me know.
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From: Srinivas Kandagatla srinivas.kandagatla@linaro.org
commit ff2faf1289c1f81b5b26b9451dd1c2006aac8db8 upstream.
dapm_kcontrol_data is freed as part of dapm_kcontrol_free(), leaving the paths pointer dangling in the list.
This leads to system crash when we try to unload and reload sound card. I hit this bug during ADSP crash/reboot test case on Dragon board DB410c.
Without this patch, on SLAB Poisoning enabled build, kernel crashes with "BUG kmalloc-128 (Tainted: G W ): Poison overwritten"
Signed-off-by: Srinivas Kandagatla srinivas.kandagatla@linaro.org Signed-off-by: Mark Brown broonie@kernel.org Cc: stable@vger.kernel.org Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org
--- sound/soc/soc-dapm.c | 2 ++ 1 file changed, 2 insertions(+)
--- a/sound/soc/soc-dapm.c +++ b/sound/soc/soc-dapm.c @@ -425,6 +425,8 @@ err_data: static void dapm_kcontrol_free(struct snd_kcontrol *kctl) { struct dapm_kcontrol_data *data = snd_kcontrol_chip(kctl); + + list_del(&data->paths); kfree(data->wlist); kfree(data); }