CVE-2022-49320

Summary

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.

Affected Software

VendorProductVersion RangeStatus
LinuxLinuxb0cc417c1637192be658e68a74c8d1568e3d35f6 < 83960276ffc9bf5570d4106490346b61e61be5f3affected
LinuxLinuxb0cc417c1637192be658e68a74c8d1568e3d35f6 < 95a0ba85c1b51b36e909841c02d205cd223ab753affected
LinuxLinuxb0cc417c1637192be658e68a74c8d1568e3d35f6 < 7b5488f4721fed6e121e661e165bab06ae2f8675affected
LinuxLinuxb0cc417c1637192be658e68a74c8d1568e3d35f6 < 4838969e4d95d2bd2995d1605b20d3144fcb3e74affected
LinuxLinuxb0cc417c1637192be658e68a74c8d1568e3d35f6 < 90aefae2e3a770a6909d339f5d8a988c0b0ceaf0affected
LinuxLinuxb0cc417c1637192be658e68a74c8d1568e3d35f6 < f9a9f43a62a04ec3183fb0da9226c7706eed0115affected
LinuxLinux4.8affected
LinuxLinux0 < 4.8unaffected
LinuxLinux5.4.198 <= 5.4.*unaffected
LinuxLinux5.10.122 <= 5.10.*unaffected
LinuxLinux5.15.47 <= 5.15.*unaffected
LinuxLinux5.17.15 <= 5.17.*unaffected
LinuxLinux5.18.4 <= 5.18.*unaffected
LinuxLinux5.19 <= *unaffected

Weaknesses

References