This is a note to let you know that I've just added the patch titled net/tls: sendfile fails with ktls offload to the 5.8-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary The filename of the patch is: net-tls-sendfile-fails-with-ktls-offload.patch and it can be found in the queue-5.8 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable@xxxxxxxxxxxxxxx> know about it. >From foo@baz Sat Oct 17 08:58:17 AM CEST 2020 From: Rohit Maheshwari <rohitm@xxxxxxxxxxx> Date: Thu, 8 Oct 2020 00:10:21 +0530 Subject: net/tls: sendfile fails with ktls offload From: Rohit Maheshwari <rohitm@xxxxxxxxxxx> [ Upstream commit ea1dd3e9d080c961b9a451130b61c72dc9a5397b ] At first when sendpage gets called, if there is more data, 'more' in tls_push_data() gets set which later sets pending_open_record_frags, but when there is no more data in file left, and last time tls_push_data() gets called, pending_open_record_frags doesn't get reset. And later when 2 bytes of encrypted alert comes as sendmsg, it first checks for pending_open_record_frags, and since this is set, it creates a record with 0 data bytes to encrypt, meaning record length is prepend_size + tag_size only, which causes problem. We should set/reset pending_open_record_frags based on more bit. Fixes: e8f69799810c ("net/tls: Add generic NIC offload infrastructure") Signed-off-by: Rohit Maheshwari <rohitm@xxxxxxxxxxx> Signed-off-by: Jakub Kicinski <kuba@xxxxxxxxxx> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- net/tls/tls_device.c | 11 ++++++----- 1 file changed, 6 insertions(+), 5 deletions(-) --- a/net/tls/tls_device.c +++ b/net/tls/tls_device.c @@ -418,14 +418,14 @@ static int tls_push_data(struct sock *sk struct tls_context *tls_ctx = tls_get_ctx(sk); struct tls_prot_info *prot = &tls_ctx->prot_info; struct tls_offload_context_tx *ctx = tls_offload_ctx_tx(tls_ctx); - int more = flags & (MSG_SENDPAGE_NOTLAST | MSG_MORE); struct tls_record_info *record = ctx->open_record; int tls_push_record_flags; struct page_frag *pfrag; size_t orig_size = size; u32 max_open_record_len; - int copy, rc = 0; + bool more = false; bool done = false; + int copy, rc = 0; long timeo; if (flags & @@ -492,9 +492,8 @@ handle_error: if (!size) { last_record: tls_push_record_flags = flags; - if (more) { - tls_ctx->pending_open_record_frags = - !!record->num_frags; + if (flags & (MSG_SENDPAGE_NOTLAST | MSG_MORE)) { + more = true; break; } @@ -526,6 +525,8 @@ last_record: } } while (!done); + tls_ctx->pending_open_record_frags = more; + if (orig_size - size > 0) rc = orig_size - size; Patches currently in stable-queue which might be from rohitm@xxxxxxxxxxx are queue-5.8/net-tls-sendfile-fails-with-ktls-offload.patch