CVE-2024-50297 Information

Description

In the Linux kernel the following vulnerability has been resolved:

net: xilinx: axienet: Enqueue Tx packets in dql before dmaengine starts

Enqueue packets in dql after dma engine starts causes race condition. Tx transfer starts once dma engine is started and may execute dql dequeue in completion before it gets queued. It results in following kernel crash while running iperf stress test:

kernel BUG at lib/dynamic_queue_limits.c:99! Internal error: Oops - BUG: 00000000f2000800 [1] SMP pc : dql_completed+0x238/0x248 lr : dql_completed+0x3c/0x248

Call trace: dql_completed+0x238/0x248 axienet_dma_tx_cb+0xa0/0x170 xilinx_dma_do_tasklet+0xdc/0x290 tasklet_action_common+0xf8/0x11c tasklet_action+0x30/0x3c handle_softirqs+0xf8/0x230

Start dmaengine after enqueue in dql fixes the crash.

Reference

https://git.kernel.org/stable/c/def3dee25cbd1c9b2ed443c3f6180e952563de77 https://git.kernel.org/stable/c/5ccdcdf186aec6b9111845fd37e1757e9b413e2f