CVE-2022-50676

In the Linux kernel, the following vulnerability has been resolved:

net: rds: don't hold sock lock when cancelling work from rdstcpreset_callbacks()

syzbot is reporting lockdep warning at rdstcpresetcallbacks() [1], for commit ac3615e7f3cffe2a ("RDS: TCP: Reduce code duplication in rdstcpresetcallbacks()") added canceldelayedworksync() into a section protected by locksock() without realizing that rdssendxmit() might call lock_sock().

We don't need to protect canceldelayedworksync() using locksock(), for even if rds_{send,recv}_worker() re-queued this work while flushwork() from canceldelayedworksync() was waiting for this work to complete, retried rds{send,recv}worker() is no-op due to the absence of RDSCONNUP bit.