Wind River Support Network

Description

In the Linux kernel, the following vulnerability has been resolved:  tls: Fix race condition in tls_sw_cancel_work_tx()  This issue was discovered during a code audit.  After cancel_delayed_work_sync() is called from tls_sk_proto_close(), tx_work_handler() can still be scheduled from paths such as the Delayed ACK handler or ksoftirqd. As a result, the tx_work_handler() worker may dereference a freed TLS object.  The following is a simple race scenario:            cpu0                         cpu1  tls_sk_proto_close()   tls_sw_cancel_work_tx()                                  tls_write_space()                                    tls_sw_write_space()                                      if (!test_and_set_bit(BIT_TX_SCHEDULED, &tx_ctx->tx_bitmask))     set_bit(BIT_TX_SCHEDULED, &ctx->tx_bitmask);     cancel_delayed_work_sync(&ctx->tx_work.work);                                      schedule_delayed_work(&tx_ctx->tx_work.work, 0);  To prevent this race condition, cancel_delayed_work_sync() is replaced with disable_delayed_work_sync().