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(parent: c46e22a) | patch
tracing: Move mutex to protect against resetting of seq data
authorSteven Rostedt (Red Hat) <rostedt@goodmis.org>
Sat, 24 Sep 2016 02:57:13 +0000 (22:57 -0400)
committerJiri Slaby <jslaby@suse.cz>
Thu, 6 Oct 2016 06:21:57 +0000 (08:21 +0200)
commitcc2b40c45c0f9a8685e6f18d370ec2c3fd705e2d
tree955f3bd168286fdee32a0925f36adff76bc6a42dtree | snapshot
parentc46e22a8540ee14967fd1f344388ca7c382b3a35commit | diff
tracing: Move mutex to protect against resetting of seq data

commit 1245800c0f96eb6ebb368593e251d66c01e61022 upstream.

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")
Reported-by: Al Viro <viro@ZenIV.linux.org.uk>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
Signed-off-by: Jiri Slaby <jslaby@suse.cz>
kernel/trace/trace.c diff | blob | history
wrapfs-5.3.y