wifi: rtl818x: Fix potential memory leaks in rtl8180_init_rx_ring()

Vulnerability Description

In the Linux kernel, the following vulnerability has been resolved: wifi: rtl818x: Fix potential memory leaks in rtl8180_init_rx_ring() In rtl8180_init_rx_ring(), memory is allocated for skb packets and DMA allocations in a loop. When an allocation fails, the previously successful allocations are not freed on exit. Fix that by jumping to err_free_rings label on error, which calls rtl8180_free_rx_ring() to free the allocations. Remove the free of rx_ring in rtl8180_init_rx_ring() error path, and set the freed priv->rx_buf entry to null, to avoid double free.

References

• https://git.kernel.org/stable/c/3677c01891fb0239361e444afee8398868e34bdf
• https://git.kernel.org/stable/c/89caaeee8dd95fae8bb4f4964e6fe3ca688500c4
• https://git.kernel.org/stable/c/a4fb7cca9837378878e6c94d9e7af019c8fdfcdb
• https://git.kernel.org/stable/c/bf8513dfa31ea015c9cf415796dca2113d293840
• https://git.kernel.org/stable/c/ee7db11742b30641f21306105ad27a275e3c61d7
• https://git.kernel.org/stable/c/a813a74570212cb5f3a7d3b05c0cb0cd00bace1d
• https://git.kernel.org/stable/c/c9d1c4152e6d32fa74034464854bee262a60bc43
• https://git.kernel.org/stable/c/9b5b9c042b30befc5b37e4539ace95af70843473