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

USB: serial: keyspan_pda: fix information leak

The write() callback is supposed to return the number of characters
accepted or a negative errno. Since the addition of write fifo support
the keyspan_pda implementation will however return the number characters
submitted to the device if the write urb is not already in use. If this
number is larger than the number of characters passed to write(), the
line discipline continues writing data from beyond the tty write buffer.

Fix the information leak by making sure that keyspan_pda_write_start()
returns zero on success as intended.

https://git.kernel.org/stable/c/2f7a6b8ab3845bd1da02604f1a874b52a4555a72

https://git.kernel.org/stable/c/6bfc8d01ac4068eced509f8fc74d0cd205e4dcec

https://git.kernel.org/stable/c/b069b7029862fafaff331d4c664d97d4ae828d6d

https://git.kernel.org/stable/c/cf6ca0aefae03958cfb5b189b0adbfb25c06bfac

https://git.kernel.org/stable/c/d4b12b6b395e43a2b1d80be3745631fcaa9c047b

https://git.kernel.org/stable/c/e1494191a3aac665d3a2fce16169a97c346253ec

https://git.kernel.org/stable/c/e52ca411f50539ff1d0c877b9312771ca8a858c1

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