Linux Kernel DMA Cleanup Vulnerability in sun8i-ce-cipher

A vulnerability in the Linux kernel's sun8i-ce-cipher component has been addressed, related to improper error handling in the sun8i_ce_cipher_prepare() function. This issue could lead to the device driver attempting to free invalid DMA memory. The vulnerability arises when dma_map_sg() fails for the destination, causing the driver to incorrectly manage DMA memory. Similarly, if dma_map_single() for the initialization vector (IV) fails, the driver would attempt to free an invalid DMA address. These errors were observed in a module linked with the cryptographic cipher example.

Impact

Exploitation of this vulnerability could lead to warnings about freeing invalid DMA memory addresses, potentially causing instability or crashes in the system.