In the Linux kernel, the following vulnerability has been resolved:
dmaengine: sh: rz-dmac: Move interrupt request after everything is set up
Once the interrupt is requested, the interrupt handler may run immediately. Since the IRQ handler can access channel->ch_base, which is initialized only after requesting the IRQ, this may lead to invalid memory access. Likewise, the IRQ thread may access uninitialized data (the ld_free, ld_queue, and ld_active lists), which may also lead to issues.
Request the interrupts only after everything is set up. To keep the error path simpler, use dmam_alloc_coherent() instead of dma_alloc_coherent().
References
- https://git.kernel.org/stable/c/07ae600bd353b22f31a8f1007269744fafc7f123
- https://git.kernel.org/stable/c/2a4d9e2234c3f817bb0ddbc8680d09ce9be84f93
- https://git.kernel.org/stable/c/5b12de6229d662864ee22c11d4876652b40120f0
- https://git.kernel.org/stable/c/731712403ddb39d1a76a11abf339a0615bc85de7
- https://git.kernel.org/stable/c/ec9f66c91bffdb69d309bae6dfb387562db7ebc8