Sai Prakash Ranjan 152631f027 coresight: etb10: Fix possible NULL ptr dereference in etb_enable_perf() ... commit 22b2beaa7f166f550424cbb3b988aeaa7ef0425a upstream. There was a report of NULL pointer dereference in ETF enable path for perf CS mode with PID monitoring. It is almost 100% reproducible when the process to monitor is something very active such as chrome and with ETF as the sink, not ETR. But code path shows that ETB has a similar path as ETF, so there could be possible NULL pointer dereference crash in ETB as well. Currently in a bid to find the pid, the owner is dereferenced via task_pid_nr() call in etb_enable_perf() and with owner being NULL, we can get a NULL pointer dereference, so have a similar fix as ETF where we cache PID in alloc_buffer() callback which is called as the part of etm_setup_aux(). Fixes: 75d7dbd388 ("coresight: etb10: Add support for CPU-wide trace scenarios") Cc: stable@vger.kernel.org Signed-off-by: Sai Prakash Ranjan <saiprakash.ranjan@codeaurora.org> Signed-off-by: Mathieu Poirier <mathieu.poirier@linaro.org> Link: https://lore.kernel.org/r/20201127175256.1092685-11-mathieu.poirier@linaro.org Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>		2020-12-30 11:50:59 +01:00
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coresight	coresight: etb10: Fix possible NULL ptr dereference in etb_enable_perf()	2020-12-30 11:50:59 +01:00
intel_th	intel_th: Disallow multi mode on devices where it's broken	2020-10-01 13:17:44 +02:00
stm	stm class: sys-t: Fix the use of time_after()	2020-03-25 08:25:56 +01:00
Kconfig	treewide: Add SPDX license identifier - Makefile/Kconfig	2019-05-21 10:50:46 +02:00