tree c945fb377258b480d806786d33fbd0f6ce118022
parent c87edb36118664f1fa275107c1138b6f47793240
author Steven Rostedt (Red Hat) <rostedt@goodmis.org> 1474685833 -0400
committer Steven Rostedt <rostedt@goodmis.org> 1474813628 -0400

tracing: Move mutex to protect against resetting of seq data

The iter->seq can be reset outside the protection of the mutex. So can
reading of user data. Move the mutex up to the beginning of the function.

Fixes: d7350c3f45694 ("tracing/core: make the read callbacks reentrants")
Cc: stable@vger.kernel.org # 2.6.30+
Reported-by: Al Viro <viro@ZenIV.linux.org.uk>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>