wifi: cfg80211: fix out-of-bounds access during multi-link element defragmentation

Vulnerability Description

In the Linux kernel, the following vulnerability has been resolved: wifi: cfg80211: fix out-of-bounds access during multi-link element defragmentation Currently during the multi-link element defragmentation process, the multi-link element length added to the total IEs length when calculating the length of remaining IEs after the multi-link element in cfg80211_defrag_mle(). This could lead to out-of-bounds access if the multi-link element or its corresponding fragment elements are the last elements in the IEs buffer. To address this issue, correctly calculate the remaining IEs length by deducting the multi-link element end offset from total IEs end offset.

References

• https://git.kernel.org/stable/c/73dde269a1a43e6b1aa92eba13ad2df58bfdd38e
• https://git.kernel.org/stable/c/9423f6da825172b8dc60d4688ed3d147291c3be9
• https://git.kernel.org/stable/c/e1c6d0c6199bd5f4cfc7a66ae7032b6e805f904d
• https://git.kernel.org/stable/c/023c1f2f0609218103cbcb48e0104b144d4a16dc