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Change History

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

net: fix potential refcount leak in ndisc_router_discovery()

The issue happens on specific paths in the function. After both the
object `rt` and `neigh` are grabbed successfully, when `lifetime` is
nonzero but the metric needs change, the function just deletes the
route and set `rt` to NULL. Then, it may try grabbing `rt` and `neigh`
again if above conditions hold. The function simply overwrite `neigh`
if succeeds or returns if fails, without decreasing the reference
count of previous `neigh`. This may result in memory leaks.

Fix it by decrementing the reference count of `neigh` in place.

https://git.kernel.org/stable/c/7396ba87f1edf549284869451665c7c4e74ecd4f

https://git.kernel.org/stable/c/7998043d31d000c3a93f46182e6569dd0eecda34

https://git.kernel.org/stable/c/ffb15594433391fd7885eb88ce5a7f7bdeefbb15