Description
In the Linux kernel, the following vulnerability has been resolved: serial: 8250_dma: Clear stale RX state on shutdown serial8250_release_dma() terminates RX DMA and releases the channel, but leaves rx_running set. If the port is closed while an RX transfer is active, the stale state remains while rxchan is NULL until the channel is requested again on the next open. The DesignWare BUSY workaround added by commit a7b9ce39fbe4 ("serial: 8250_dw: Ensure BUSY is deasserted") calls serial8250_rx_dma_flush() from the LCR write path during startup. This happens before serial8250_request_dma() obtains a new RX channel. On reopen, the stale rx_running state therefore makes the flush path pass a NULL channel to dmaengine_pause(), causing a kernel Oops. Clear rx_running after terminating RX DMA, matching the TX cleanup. Also make the flush helper return if the DMA object or RX channel is not available so startup and teardown paths cannot pass a NULL channel to the DMAengine API.
Affected products
Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.
Linux Linux
Default version status: unaffected
0fcb7901f9d61a325b4c5b88c600383bcbeb97fe to < bf4fb620e02962b2b52500a4b3d8420f351eb46aaffected0fcb7901f9d61a325b4c5b88c600383bcbeb97fe to < e10f06ee050a08930e2339b6fec7148fd0b2a8f6affected0fcb7901f9d61a325b4c5b88c600383bcbeb97fe to < d06cfb1add4a2d5b393e9e31f49ebbd168beea49affected0fcb7901f9d61a325b4c5b88c600383bcbeb97fe to < e7a5d792cf64a2096e18f1d573cc3d01cba15e92affected0fcb7901f9d61a325b4c5b88c600383bcbeb97fe to < 9f2444f4c0e4b06f61bae38da87c9c94c78efa86affected0fcb7901f9d61a325b4c5b88c600383bcbeb97fe to < ae05d9e50b6b9f246c110b3bdc03676145c2d0d4affected0fcb7901f9d61a325b4c5b88c600383bcbeb97fe to < e7e3cc6709caa49d1d6ce6c1f7cb305e38675cc9affected0fcb7901f9d61a325b4c5b88c600383bcbeb97fe to < e2fe6a0efecbef00e3ecc2db64dd5afa8c212b41affected
Linux Linux
Default version status: affected
3.19affected0 to < 3.19unaffected5.10.265 to ≤ 5.10.*unaffected5.15.216 to ≤ 5.15.*unaffected6.1.183 to ≤ 6.1.*unaffected6.6.152 to ≤ 6.6.*unaffected6.12.104 to ≤ 6.12.*unaffected6.18.45 to ≤ 6.18.*unaffected7.1.9 to ≤ 7.1.*unaffected7.2 to ≤ *unaffected
References
- https://git.kernel.org/stable/c/bf4fb620e02962b2b52500a4b3d8420f351eb46a ↗
- https://git.kernel.org/stable/c/e10f06ee050a08930e2339b6fec7148fd0b2a8f6 ↗
- https://git.kernel.org/stable/c/d06cfb1add4a2d5b393e9e31f49ebbd168beea49 ↗
- https://git.kernel.org/stable/c/e7a5d792cf64a2096e18f1d573cc3d01cba15e92 ↗
- https://git.kernel.org/stable/c/9f2444f4c0e4b06f61bae38da87c9c94c78efa86 ↗
- https://git.kernel.org/stable/c/ae05d9e50b6b9f246c110b3bdc03676145c2d0d4 ↗
- https://git.kernel.org/stable/c/e7e3cc6709caa49d1d6ce6c1f7cb305e38675cc9 ↗
- https://git.kernel.org/stable/c/e2fe6a0efecbef00e3ecc2db64dd5afa8c212b41 ↗