Advisory Published
CVE Published
Updated

CVE-2024-40970: Avoid hw_desc array overrun in dw-axi-dmac

First published: Fri Jul 12 2024(Updated: )

In the Linux kernel, the following vulnerability has been resolved: Avoid hw_desc array overrun in dw-axi-dmac I have a use case where nr_buffers = 3 and in which each descriptor is composed by 3 segments, resulting in the DMA channel descs_allocated to be 9. Since axi_desc_put() handles the hw_desc considering the descs_allocated, this scenario would result in a kernel panic (hw_desc array will be overrun). To fix this, the proposal is to add a new member to the axi_dma_desc structure, where we keep the number of allocated hw_descs (axi_desc_alloc()) and use it in axi_desc_put() to handle the hw_desc array correctly. Additionally I propose to remove the axi_chan_start_first_queued() call after completing the transfer, since it was identified that unbalance can occur (started descriptors can be interrupted and transfer ignored due to DMA channel not being enabled).

Credit: 416baaa9-dc9f-4396-8d5f-8c081fb06d67 416baaa9-dc9f-4396-8d5f-8c081fb06d67

Affected SoftwareAffected VersionHow to fix
Linux Linux kernel<5.15.162
Linux Linux kernel>=5.16<6.1.96
Linux Linux kernel>=6.2<6.6.36
Linux Linux kernel>=6.7<6.9.7
debian/linux<=5.10.223-1<=5.10.226-1
6.1.106-3
6.1.112-1
6.11.5-1
6.11.6-1

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