Description
In the Linux kernel, the following vulnerability has been resolved: PCI: switchtec: Fix stdev_release() crash after surprise hot remove A PCI device hot removal may occur while stdev->cdev is held open. The call to stdev_release() then happens during close or exit, at a point way past switchtec_pci_remove(). Otherwise the last ref would vanish with the trailing put_device(), just before return. At that later point in time, the devm cleanup has already removed the stdev->mmio_mrpc mapping. Also, the stdev->pdev reference was not a counted one. Therefore, in DMA mode, the iowrite32() in stdev_release() will cause a fatal page fault, and the subsequent dma_free_coherent(), if reached, would pass a stale &stdev->pdev->dev pointer. Fix by moving MRPC DMA shutdown into switchtec_pci_remove(), after stdev_kill(). Counting the stdev->pdev ref is now optional, but may prevent future accidents. Reproducible via the script at https://lore.kernel.org/r/20231113212150.96410-1-dns@arista.com
Affected products
Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.
Linux Linux
Default version status: unaffected
f7eb7b8a4f72b0d9dea69b09f58185ffab97fd35 to < d8c293549946ee5078ed0ab77793cec365559355affectedf7eb7b8a4f72b0d9dea69b09f58185ffab97fd35 to < 4a5d0528cf19dbf060313dffbe047bc11c90c24caffectedf7eb7b8a4f72b0d9dea69b09f58185ffab97fd35 to < ff1c7e2fb9e9c3f53715fbe04d3ac47b80be7eb8affectedf7eb7b8a4f72b0d9dea69b09f58185ffab97fd35 to < 1d83c85922647758c1f1e4806a4c5c3cf591a20aaffectedf7eb7b8a4f72b0d9dea69b09f58185ffab97fd35 to < 0233b836312e39a3c763fb53512b3fa455b473b3affectedf7eb7b8a4f72b0d9dea69b09f58185ffab97fd35 to < e129c7fa7070fbce57feb0bfc5eaa65eef44b693affectedf7eb7b8a4f72b0d9dea69b09f58185ffab97fd35 to < df25461119d987b8c81d232cfe4411e91dcabe66affected
Linux Linux
Default version status: affected
5.0affected0 to < 5.0unaffected5.4.269 to ≤ 5.4.*unaffected5.10.210 to ≤ 5.10.*unaffected5.15.149 to ≤ 5.15.*unaffected6.1.77 to ≤ 6.1.*unaffected6.6.16 to ≤ 6.6.*unaffected6.7.4 to ≤ 6.7.*unaffected6.8 to ≤ *unaffected
References
- https://git.kernel.org/stable/c/d8c293549946ee5078ed0ab77793cec365559355 ↗
- https://git.kernel.org/stable/c/4a5d0528cf19dbf060313dffbe047bc11c90c24c ↗
- https://git.kernel.org/stable/c/ff1c7e2fb9e9c3f53715fbe04d3ac47b80be7eb8 ↗
- https://git.kernel.org/stable/c/1d83c85922647758c1f1e4806a4c5c3cf591a20a ↗
- https://git.kernel.org/stable/c/0233b836312e39a3c763fb53512b3fa455b473b3 ↗
- https://git.kernel.org/stable/c/e129c7fa7070fbce57feb0bfc5eaa65eef44b693 ↗
- https://git.kernel.org/stable/c/df25461119d987b8c81d232cfe4411e91dcabe66 ↗
- https://lists.debian.org/debian-lts-announce/2024/06/msg00017.html ↗