In the Linux kernel, the following vulnerability has been resolved:

spi: bcm2835: bcm2835_spi_handle_err(): fix NULL pointer deref for non DMA transfers

In case a IRQ based transfer times out the bcm2835_spi_handle_err()
function is called. Since commit 1513ceee70f2 ("spi: bcm2835: Drop
dma_pending flag") the TX and RX DMA transfers are unconditionally
canceled, leading to NULL pointer derefs if ctlr->dma_tx or
ctlr->dma_rx are not set.

Fix the NULL pointer deref by checking that ctlr->dma_tx and
ctlr->dma_rx are valid pointers before accessing them.

https://git.kernel.org/stable/c/49ffa473218012e765682343de2052eb4c1f06a7

https://git.kernel.org/stable/c/4ceaa684459d414992acbefb4e4c31f2dfc50641

https://git.kernel.org/stable/c/58466e05390043d2805685c70f55f3f59711bdf2

https://git.kernel.org/stable/c/684896e675edd8b669fd3e9f547c5038222d85bc

https://git.kernel.org/stable/c/76668d2a2f367d25ff448e6d7087406af7d7bb2b