CVE-2022-50541

In the Linux kernel, the following vulnerability has been resolved:<br /> <br /> dmaengine: ti: k3-udma: Reset UDMA_CHAN_RT byte counters to prevent overflow<br /> <br /> UDMA_CHAN_RT_*BCNT_REG stores the real-time channel bytecount statistics.<br /> These registers are 32-bit hardware counters and the driver uses these<br /> counters to monitor the operational progress status for a channel, when<br /> transferring more than 4GB of data it was observed that these counters<br /> overflow and completion calculation of a operation gets affected and the<br /> transfer hangs indefinitely.<br /> <br /> This commit adds changes to decrease the byte count for every complete<br /> transaction so that these registers never overflow and the proper byte<br /> count statistics is maintained for ongoing transaction by the RT counters.<br /> <br /> Earlier uc-&gt;bcnt used to maintain a count of the completed bytes at driver<br /> side, since the RT counters maintain the statistics of current transaction<br /> now, the maintenance of uc-&gt;bcnt is not necessary.