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Change History

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

mptcp: pm: ADD_ADDR rtx: always decrease sk refcount

When an ADD_ADDR is retransmitted, the sk is held in sk_reset_timer().
It should then be released in all cases at the end.

Some (unlikely) checks were returning directly instead of calling
sock_put() to decrease the refcount. Jump to a new 'exit' label to call
__sock_put() (which will become sock_put() in the next commit) to fix
this potential leak.

While at it, drop the '!msk' check which cannot happen because it is
never reset, and explicitly mark the remaining one as "unlikely".

https://git.kernel.org/stable/c/25e37407442b8766ec2cf52fb4e31b5c3d3aeeae

https://git.kernel.org/stable/c/9634cb35af17019baec21ca648516ce376fa10e6

https://git.kernel.org/stable/c/acd3d3562315c99f3c0db16f0fcc5f0306638982