CVE-2024-50297

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!

<snip>

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

<snip>

Start dmaengine after enqueue in dql fixes the crash.