kernel: bluetooth: Fix kernel crash on L2CAP stress tests

[Eugene Teo <eugeneteo () kernel sg>]

Heads-up, I believe this fix addresses a security-relevant issue. See 
upstream commit c2c77ec8. It was introduced in commit f2fcfcd6 
(v2.6.32-rc1). I did not request a CVE name for this since it did not 
affect any of our supported Red Hat kernels.

http://git.kernel.org/linus/c2c77ec83bdad17fb688557b5b3fdc36661dd1c6
http://git.kernel.org/linus/f2fcfcd670257236ebf2088bbdf26f6a8ef459fe

https://bugzilla.redhat.com/show_bug.cgi?id=576433

If it affected your commercially supported kernel, please request a CVE 
name. Thanks.

Eugene