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CVE-2022-48723: spi: uniphier: fix reference count leak in uniphier_spi_probe()

• Severity: medium (CVSS 5.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2024-06-20 · updated 2026-06-17

Description

In the Linux kernel, the following vulnerability has been resolved: spi: uniphier: fix reference count leak in uniphier_spi_probe() The issue happens in several error paths in uniphier_spi_probe(). When either dma_get_slave_caps() or devm_spi_register_master() returns an error code, the function forgets to decrease the refcount of both `dma_rx` and `dma_tx` objects, which may lead to refcount leaks. Fix it by decrementing the reference count of specific objects in those error paths.

Affected products

• Linux kernel: from 5.6 before 5.10.99; from 5.11 before 5.15.22; from 5.16 before 5.16.8; 5.17-rc1, 5.17-rc2 — fixed in 5.10.99, 5.15.22, 5.16.8

How to fix

Upgrade to a fixed version: Linux kernel 5.10.99, 5.15.22, 5.16.8. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/37c2c83ca4f1ef4b6908181ac98e18360af89b42
• https://git.kernel.org/stable/c/447c3d4046d7b54052d07d8b27e15e6edea5662c
• https://git.kernel.org/stable/c/dd00b4f8f768d81c3788a8ac88fdb3d745e55ea3
• https://git.kernel.org/stable/c/e895e067d73e154b1ebc84a124e00831e311d9b0
• https://git.kernel.org/stable/c/37c2c83ca4f1ef4b6908181ac98e18360af89b42
• https://git.kernel.org/stable/c/447c3d4046d7b54052d07d8b27e15e6edea5662c
• https://git.kernel.org/stable/c/dd00b4f8f768d81c3788a8ac88fdb3d745e55ea3
• https://git.kernel.org/stable/c/e895e067d73e154b1ebc84a124e00831e311d9b0

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