kernel: net:emac/emac-mac: Fix a use after free in emac_mac_tx_buf_send

A use-after-free flaw was found in the Linux kernel’s Qualcomm Gigabit Ethernet Media Access Controller EMAC driver in how a user triggers an error path in the emactxfilltpd function. This flaw allows a local user to crash or potentially escalate their privileges on the system...