tree 31360ad568f3004066f220cb8a4b16a0489c85a5
parent cb86e05390debcc084cfdb0a71ed4c5dbbec517d
author Steven Rostedt (Red Hat) <rostedt@goodmis.org> 1458330408 -0400
committer Steven Rostedt <rostedt@goodmis.org> 1458330702 -0400

tracing: Fix crash from reading trace_pipe with sendfile

If tracing contains data and the trace_pipe file is read with sendfile(),
then it can trigger a NULL pointer dereference and various BUG_ON within the
VM code.

There's a patch to fix this in the splice_to_pipe() code, but it's also a
good idea to not let that happen from trace_pipe either.

Link: http://lkml.kernel.org/r/1457641146-9068-1-git-send-email-rabin@rab.in

Cc: stable@vger.kernel.org # 2.6.30+
Reported-by: Rabin Vincent <rabin.vincent@gmail.com>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>