net: tls, fix WARNIING in __sk_msg_free

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

net: tls, fix WARNIING in __sk_msg_free

A splice with MSG_SPLICE_PAGES will cause tls code to use the

tls_sw_sendmsg_splice path in the TLS sendmsg code to move the user

provided pages from the msg into the msg_pl. This will loop over the

msg until msg_pl is full, checked by sk_msg_full(msg_pl). The user

can also set the MORE flag to hint stack to delay sending until receiving

more pages and ideally a full buffer.

If the user adds more pages to the msg than can fit in the msg_pl

scatterlist (MAX_MSG_FRAGS) we should ignore the MORE flag and send

the buffer anyways.

What actually happens though is we abort the msg to msg_pl scatterlist

setup and then because we forget to set 'full record' indicating we

can no longer consume data without a send we fallthrough to the 'continue'

path which will check if msg_data_left(msg) has more bytes to send and

then attempts to fit them in the already full msg_pl. Then next

iteration of sender doing send will encounter a full msg_pl and throw

the warning in the syzbot report.

To fix simply check if we have a full_record in splice code path and

if not send the msg regardless of MORE flag.