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

mmc: sdio uart: fix xmit fifo leak when the port table is full

sdio uart add port() allocates the transmit fifo before claiming a slot in sdio uart table[]. When all UART NR slots are taken, it returns -EBUSY with the fifo still allocated, but the probe error path only kfree()s the port, leaking the transmit fifo.

Free the fifo in the failure path of sdio uart add port() itself so the function retains nothing on error.