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

mlxsw: fix refcount leak in mlxsw_sp_vrs_lpm_tree_replace()

When mlxsw_sp_vrs_lpm_tree_replace() fails after replacing some VRs,
the error rollback loop does not correctly revert the preceding
replacements. The loop decrements the index but fails to update the
vr pointer, which still points to the VR that caused the failure. As
a result, the condition and the rollback call always operate on the
same VR, potentially calling mlxsw_sp_vr_lpm_tree_replace() multiple
times on it while never rolling back the earlier VRs. Those VRs
continue to hold a reference to new_tree acquired via
mlxsw_sp_lpm_tree_hold(), leaking the reference count of new_tree.

Fix by reinitializing vr inside the error loop with the updated index:

	vr = &mlxsw_sp->router->vrs[i];

so that the loop correctly iterates over all VRs that were actually
replaced.

https://git.kernel.org/stable/c/21cf8dc478a49e8de039c2739b1646a774cb1944

https://git.kernel.org/stable/c/220d41bdce41fe5a39a7f419faab1e907b4093c2

https://git.kernel.org/stable/c/3a2b47d1b4b3de54d030a7fdb6a322c970513ee3

https://git.kernel.org/stable/c/7203ac71d3895fa5948b319dd724f0e1cffbc4a1

https://git.kernel.org/stable/c/8adebf07b46df79a0e49a6d4ae384f0db7c91db6

https://git.kernel.org/stable/c/9e4a6185679922305ea1df68403f00ccc512656b

https://git.kernel.org/stable/c/c2c75c45b54f3b12eafb28a4eb47f8821512c1aa

https://git.kernel.org/stable/c/f6454a5fbf2224ad30ec70e686a6c592561da1f2

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