CVE-2022-49320 Information

Description

In the Linux kernel the following vulnerability has been resolved:

dmaengine: zynqmp_dma: In struct zynqmp_dma_chan fix desc_size data type

In zynqmp_dma_alloc/free_chan_resources functions there is a potential overflow in the below expressions.

dma_alloc_coherent(chan->dev (2 chan->desc_size ZYNQMP_DMA_NUM_DESCS) &chan->desc_pool_p GFP_KERNEL);

dma_free_coherent(chan->dev(2 ZYNQMP_DMA_DESC_SIZE(chan) ZYNQMP_DMA_NUM_DESCS) chan->desc_pool_v chan->desc_pool_p);

The arguments desc_size and ZYNQMP_DMA_NUM_DESCS were 32 bit. Though this overflow condition is not observed but it is a potential problem in the case of 32-bit multiplication. Hence fix it by changing the desc_size data type to size_t.

In addition to coverity fix it also reuse ZYNQMP_DMA_DESC_SIZE macro in dma_alloc_coherent API argument.

Addresses-Coverity: Event overflow_before_widen.

Reference

https://git.kernel.org/stable/c/4838969e4d95d2bd2995d1605b20d3144fcb3e74 https://git.kernel.org/stable/c/7b5488f4721fed6e121e661e165bab06ae2f8675 https://git.kernel.org/stable/c/83960276ffc9bf5570d4106490346b61e61be5f3 https://git.kernel.org/stable/c/90aefae2e3a770a6909d339f5d8a988c0b0ceaf0 https://git.kernel.org/stable/c/95a0ba85c1b51b36e909841c02d205cd223ab753 https://git.kernel.org/stable/c/f9a9f43a62a04ec3183fb0da9226c7706eed0115