tls: Stricter error checking in zerocopy sendmsg path
In the zerocopy sendmsg() path, there are error checks to revert the zerocopy if we get any error code. syzkaller has discovered that tls_push_record can return -ECONNRESET, which is fatal, and happens after the point at which it is safe to revert the iter, as we've already passed the memory to do_tcp_sendpages. Previously this code could return -ENOMEM and we would want to revert the iter, but AFAIK this no longer returns ENOMEM after a447da7d ("tls: fix waitall behavior in tls_sw_recvmsg"), so we fail for all error codes. Reported-by:<syzbot+c226690f7b3126c5ee04@syzkaller.appspotmail.com> Reported-by:
<syzbot+709f2810a6a05f11d4d3@syzkaller.appspotmail.com> Signed-off-by:
Dave Watson <davejwatson@fb.com> Fixes: 3c4d7559 ("tls: kernel TLS support") Signed-off-by:
David S. Miller <davem@davemloft.net>
parent
24d4e34f
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