Description
In the Linux kernel, the following vulnerability has been resolved: spi: sun6i: fix race between DMA RX transfer completion and RX FIFO drain Previously the transfer complete IRQ immediately drained to RX FIFO to read any data remaining in FIFO to the RX buffer. This behaviour is correct when dealing with SPI in interrupt mode. However in DMA mode the transfer complete interrupt still fires as soon as all bytes to be transferred have been stored in the FIFO. At that point data in the FIFO still needs to be picked up by the DMA engine. Thus the drain procedure and DMA engine end up racing to read from RX FIFO, corrupting any data read. Additionally the RX buffer pointer is never adjusted according to DMA progress in DMA mode, thus calling the RX FIFO drain procedure in DMA mode is a bug. Fix corruptions in DMA RX mode by draining RX FIFO only in interrupt mode. Also wait for completion of RX DMA when in DMA mode before returning to ensure all data has been copied to the supplied memory buffer.
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
345980a3a5e5e1c99fc621e2ce878fb150ad2287 to < bd1ec7f9983b5cd3c77e0f7cda3fa8aed041af2faffected345980a3a5e5e1c99fc621e2ce878fb150ad2287 to < 36b29974a7ad2ff604c24ad348f940506c7b1209affected345980a3a5e5e1c99fc621e2ce878fb150ad2287 to < 4e149d524678431638ff378ef6025e4e89b71097affected345980a3a5e5e1c99fc621e2ce878fb150ad2287 to < 1f11f4202caf5710204d334fe63392052783876daffected
Linux Linux
Default version status: affected
5.11affected0 to < 5.11unaffected5.15.134 to ≤ 5.15.*unaffected6.1.56 to ≤ 6.1.*unaffected6.5.6 to ≤ 6.5.*unaffected6.6 to ≤ *unaffected