ring-buffer: Fix crash due to uninitialized new_pages list head
authorVaibhav Nagarnaik <vnagarnaik@google.com>
Fri, 22 Jun 2012 18:50:05 +0000 (11:50 -0700)
committerSteven Rostedt <rostedt@goodmis.org>
Fri, 29 Jun 2012 20:16:35 +0000 (16:16 -0400)
commit44b99462d9d776522e174d6c531ce5ccef309e26
tree084dba8a82b1d0e6da17063e200d62a07c6a6e76
parent662f5cedb38c4b88e1cebfd54a88159f2f7ab7b9
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>
kernel/trace/ring_buffer.c