From: Xiaomeng Tong xiam0nd.tong@gmail.com
commit f730a46b931d894816af34a0ff8e4ad51565b39f upstream.
These two bug are here: list_for_each_entry_safe_continue(w, n, list, power_list); list_for_each_entry_safe_continue(w, n, list, power_list);
After the list_for_each_entry_safe_continue() exits, the list iterator will always be a bogus pointer which point to an invalid struct objdect containing HEAD member. The funciton poniter 'w->event' will be a invalid value which can lead to a control-flow hijack if the 'w' can be controlled.
The original intention was to continue the outer list_for_each_entry_safe() loop with the same entry if w->event is NULL, but misunderstanding the meaning of list_for_each_entry_safe_continue().
So just add a 'continue;' to fix the bug.
Cc: stable@vger.kernel.org Fixes: 163cac061c973 ("ASoC: Factor out DAPM sequence execution") Signed-off-by: Xiaomeng Tong xiam0nd.tong@gmail.com Link: https://lore.kernel.org/r/20220329012134.9375-1-xiam0nd.tong@gmail.com Signed-off-by: Mark Brown broonie@kernel.org Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- sound/soc/soc-dapm.c | 6 ++---- 1 file changed, 2 insertions(+), 4 deletions(-)
--- a/sound/soc/soc-dapm.c +++ b/sound/soc/soc-dapm.c @@ -1569,8 +1569,7 @@ static void dapm_seq_run(struct snd_soc_ switch (w->id) { case snd_soc_dapm_pre: if (!w->event) - list_for_each_entry_safe_continue(w, n, list, - power_list); + continue;
if (event == SND_SOC_DAPM_STREAM_START) ret = w->event(w, @@ -1582,8 +1581,7 @@ static void dapm_seq_run(struct snd_soc_
case snd_soc_dapm_post: if (!w->event) - list_for_each_entry_safe_continue(w, n, list, - power_list); + continue;
if (event == SND_SOC_DAPM_STREAM_START) ret = w->event(w,