In the Linux kernel, the following vulnerability has been resolved:
serial: qcom_geni: fix kfifo underflow when flush precedes DMA completion IRQ
When uart_flush_buffer() runs before the DMA completion IRQ is delivered, the following race can occur (all steps serialized by uart_port_lock):
- DMA starts: tx_remaining = N, kfifo contains N bytes
- DMA completes in hardware; IRQ is pending but not yet delivered
- uart_flush_buffer() acquires the port lock and calls kfifo_reset(),
- uart_flush_buffer() releases the port lock
- DMA IRQ fires; handle_tx_dma() acquires the port lock and calls
uart_xmit_advance() increments kfifo->out by tx_remaining. Since kfifo_reset() already set both in and out to 0, out wraps past in, causing kfifo_len() to return UART_XMIT_SIZE - tx_remaining. The next start_tx_dma() call then submits a DMA transfer of stale buffer data.
Fix this by snapshotting kfifo_len() at the start of handle_tx_dma() and skipping uart_xmit_advance() when fifo_len < tx_remaining, which indicates the kfifo was reset by a preceding flush.