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

net: openvswitch: fix possible kfree_skb of ERR_PTR

After the patch in the "Fixes" tag, the allocation of the "reply" skb
can happen either before or after locking the ovs_mutex.

However, error cleanups still follow the classical reversed order,
assuming "reply" is allocated before locking: it is freed after unlocking.

If "reply" allocation happens after locking the mutex and it fails,
"reply" is left with an ERR_PTR, and execution jumps to the correspondent
cleanup stage which will try to free an invalid pointer.

Fix this by setting the pointer to NULL after having saved its error
value.

https://git.kernel.org/stable/c/0bb5b2dc1b90aa7dd1473fc8c4d813a29255ff8d

https://git.kernel.org/stable/c/25fdf53698535fe8790237f5a8a9626791429785

https://git.kernel.org/stable/c/895d1dd9057cde1687fa0f4286d47ceed0b82997

https://git.kernel.org/stable/c/971b1b37774f13acc5add0a2843f8598446b8598

https://git.kernel.org/stable/c/e248fb2e680deb2bd37bac551b72638fe4938a76

https://git.kernel.org/stable/c/e3d509a1b71396e1452060dbf84a805fd1c3c549

https://git.kernel.org/stable/c/ecc55aad3390129a87106841f4b68bf3d70c9264

https://git.kernel.org/stable/c/ee30dd2909d8b98619f4341c70ec8dc8e155ab02

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