dmaengine: fix NULL pointer in channel unregistration function

Vulnerability Description

In the Linux kernel, the following vulnerability has been resolved: dmaengine: fix NULL pointer in channel unregistration function __dma_async_device_channel_register() can fail. In case of failure, chan->local is freed (with free_percpu()), and chan->local is nullified. When dma_async_device_unregister() is called (because of managed API or intentionally by DMA controller driver), channels are unconditionally unregistered, leading to this NULL pointer: [ 1.318693] Unable to handle kernel NULL pointer dereference at virtual address 00000000000000d0 [...] [ 1.484499] Call trace: [ 1.486930] device_del+0x40/0x394 [ 1.490314] device_unregister+0x20/0x7c [ 1.494220] __dma_async_device_channel_unregister+0x68/0xc0 Look at dma_async_device_register() function error path, channel device unregistration is done only if chan->local is not NULL. Then add the same condition at the beginning of __dma_async_device_channel_unregister() function, to avoid NULL pointer issue whatever the API used to reach this function.

References

• https://git.kernel.org/stable/c/9de69732dde4e443c1c7f89acbbed2c45a6a8e17
• https://git.kernel.org/stable/c/047fce470412ab64cb7345f9ff5d06919078ad79
• https://git.kernel.org/stable/c/2ab32986a0b9e329eb7f8f04dd57cc127f797c08
• https://git.kernel.org/stable/c/7f0ccfad2031eddcc510caf4e57f2d4aa2d8a50b
• https://git.kernel.org/stable/c/9263fd2a63487c6d04cbb7b74a48fb12e1e352d0
• https://git.kernel.org/stable/c/f5c24d94512f1b288262beda4d3dcb9629222fc7