Description (CNA)
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).
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected ef6fb2d6f1abd56cc067c694253ea362159b5ac3 before 7c3bb96a20cd8db3b8824b2ff08b6cde4505c7e5; affected ef6fb2d6f1abd56cc067c694253ea362159b5ac3 before dd42570018f5962c10f215ad9c21274ed5d3541e; affected ef6fb2d6f1abd56cc067c694253ea362159b5ac3 before e151ae1ee065cf4b8ce4394ddb9d9c8df6370c66; affected ef6fb2d6f1abd56cc067c694253ea362159b5ac3 before 9004784e8d68bcd1ac1376407ba296fa28f04dbe; affected ef6fb2d6f1abd56cc067c694253ea362159b5ac3 before 333e11bf47fa8d477db90e2900b1ed3c9ae9b697 |
| Linux / Linux | affected 5.12; unaffected 0 before 5.12; unaffected 5.15.162 through 5.15.*; unaffected 6.1.96 through 6.1.*; unaffected 6.6.36 through 6.6.*; unaffected 6.9.7 through 6.9.*; unaffected 6.10 through * |
CWE
No CWE identifiers supplied.
References
- https://git.kernel.org/stable/c/7c3bb96a20cd8db3b8824b2ff08b6cde4505c7e5
- https://git.kernel.org/stable/c/dd42570018f5962c10f215ad9c21274ed5d3541e
- https://git.kernel.org/stable/c/e151ae1ee065cf4b8ce4394ddb9d9c8df6370c66
- https://git.kernel.org/stable/c/9004784e8d68bcd1ac1376407ba296fa28f04dbe
- https://git.kernel.org/stable/c/333e11bf47fa8d477db90e2900b1ed3c9ae9b697
ADP enrichment
No English description supplied.
- https://git.kernel.org/stable/c/7c3bb96a20cd8db3b8824b2ff08b6cde4505c7e5
- https://git.kernel.org/stable/c/dd42570018f5962c10f215ad9c21274ed5d3541e
- https://git.kernel.org/stable/c/e151ae1ee065cf4b8ce4394ddb9d9c8df6370c66
- https://git.kernel.org/stable/c/9004784e8d68bcd1ac1376407ba296fa28f04dbe
- https://git.kernel.org/stable/c/333e11bf47fa8d477db90e2900b1ed3c9ae9b697
- https://lists.debian.org/debian-lts-announce/2025/01/msg00001.html
No English description supplied.
No references supplied.