From: Vaibhav Nagarnaik <vnagarnaik@google.com>
Date: Fri, 22 Jun 2012 18:50:05 +0000 (-0700)
Subject: ring-buffer: Fix crash due to uninitialized new_pages list head
X-Git-Tag: v3.5-rc7~7^3^2~1
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=44b99462d9d776522e174d6c531ce5ccef309e26;p=pandora-kernel.git

ring-buffer: Fix crash due to uninitialized new_pages list head

The new_pages list head in the cpu_buffer is not initialized. When
adding pages to the ring buffer, if the memory allocation fails in
ring_buffer_resize, the clean up handler tries to free up the allocated
pages from all the cpu buffers. The panic is caused by referencing the
uninitialized new_pages list head.

Initializing the new_pages list head in rb_allocate_cpu_buffer fixes
this.

Link: http://lkml.kernel.org/r/1340391005-10880-1-git-send-email-vnagarnaik@google.com

Cc: Justin Teravest <teravest@google.com>
Cc: David Sharp <dhsharp@google.com>
Signed-off-by: Vaibhav Nagarnaik <vnagarnaik@google.com>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
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