cve-2024-26807
Vulnerability from cvelistv5
Published
2024-04-04 08:20
Modified
2024-12-19 08:47
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: Both cadence-quadspi ->runtime_suspend() and ->runtime_resume() implementations start with: struct cqspi_st *cqspi = dev_get_drvdata(dev); struct spi_controller *host = dev_get_drvdata(dev); This obviously cannot be correct, unless "struct cqspi_st" is the first member of " struct spi_controller", or the other way around, but it is not the case. "struct spi_controller" is allocated by devm_spi_alloc_host(), which allocates an extra amount of memory for private data, used to store "struct cqspi_st". The ->probe() function of the cadence-quadspi driver then sets the device drvdata to store the address of the "struct cqspi_st" structure. Therefore: struct cqspi_st *cqspi = dev_get_drvdata(dev); is correct, but: struct spi_controller *host = dev_get_drvdata(dev); is not, as it makes "host" point not to a "struct spi_controller" but to the same "struct cqspi_st" structure as above. This obviously leads to bad things (memory corruption, kernel crashes) directly during ->probe(), as ->probe() enables the device using PM runtime, leading the ->runtime_resume() hook being called, which in turns calls spi_controller_resume() with the wrong pointer. This has at least been reported [0] to cause a kernel crash, but the exact behavior will depend on the memory contents. [0] https://lore.kernel.org/all/20240226121803.5a7r5wkpbbowcxgx@dhruva/ This issue potentially affects all platforms that are currently using the cadence-quadspi driver.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/03f1573c9587029730ca68503f5062105b122f61
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/32ce3bb57b6b402de2aec1012511e7ac4e7449dc
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/34e1d5c4407c78de0e3473e1fbf8fb74dbe66d03
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/03f1573c9587029730ca68503f5062105b122f61
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/32ce3bb57b6b402de2aec1012511e7ac4e7449dc
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/34e1d5c4407c78de0e3473e1fbf8fb74dbe66d03
Impacted products
Vendor Product Version
Linux Linux Version: 6.4
Show details on NVD website

To clipboard 

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