Re: [v3.0 stable version][PATCH 1/2] ring-buffer: Fix NULL pointer if rb_set_head_page() fails

On Fri, Nov 30, 2012 at 11:16:43AM -0500, Steven Rostedt wrote:

The function rb_set_head_page() searches the list of ring buffer
pages for a the page that has the HEAD page flag set. If it does
not find it, it will do a WARN_ON(), disable the ring buffer and
return NULL, as this should never happen.

But if this bug happens to happen, not all callers of this function
can handle a NULL pointer being returned from it. That needs to be
fixed.

Cc: stable@vger.kernel.org # 3.0+
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
---
 kernel/trace/ring_buffer.c |    9 +++++++--
 1 files changed, 7 insertions(+), 2 deletions(-)

I don't understand why you sent these to stable@ right now, I don't see
them in Linus's tree, so why are they needed here?

Care to resend them when they hit Linus's tree?

thanks,

greg k-h