Vulnerability CVE-2021-47291
Published: 2024-05-21

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

ipv6: fix another slab-out-of-bounds in fib6_nh_flush_exceptions

While running the self-tests on a KASAN enabled kernel, I observed a
slab-out-of-bounds splat very similar to the one reported in
commit 821bbf79fe46 ("ipv6: Fix KASAN: slab-out-of-bounds Read in
fib6_nh_flush_exceptions").

We additionally need to take care of fib6_metrics initialization
failure when the caller provides an nh.

The fix is similar, explicitly free the route instead of calling
fib6_info_release on a half-initialized object.

 References:
https://git.kernel.org/stable/c/830251361425c5be044db4d826aaf304ea3d14c6
https://git.kernel.org/stable/c/ce8fafb68051fba52546f8bbe8621f7641683680
https://git.kernel.org/stable/c/115784bcccf135c3a3548098153413d76f16aae0
https://git.kernel.org/stable/c/8fb4792f091e608a0a1d353dfdf07ef55a719db5
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