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Change History

In the Linux kernel, the following vulnerability has been resolved:

net: dsa: realtek: fix out-of-bounds access

The probe function sets priv->chip_data to (void *)priv + sizeof(*priv)
with the expectation that priv has enough trailing space.

However, only realtek-smi actually allocated this chip_data space.
Do likewise in realtek-mdio to fix out-of-bounds accesses.

These accesses likely went unnoticed so far, because of an (unused)
buf[4096] member in struct realtek_priv, which caused kmalloc to
round up the allocated buffer to a big enough size, so nothing of
value was overwritten. With a different allocator (like in the barebox
bootloader port of the driver) or with KASAN, the memory corruption
becomes quickly apparent.

https://git.kernel.org/stable/c/b93eb564869321d0dffaf23fcc5c88112ed62466

https://git.kernel.org/stable/c/cc0f9bb99735d2b68fac68f37b585d615728ce5b

https://git.kernel.org/stable/c/fe668aa499b4b95425044ba11af9609db6ecf466