Patch "afs: Better abort and net error handling" has been added to the 4.9-stable tree

[<gregkh@linuxfoundation.org>]

This is a note to let you know that I've just added the patch titled

    afs: Better abort and net error handling

to the 4.9-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:
     afs-better-abort-and-net-error-handling.patch
and it can be found in the queue-4.9 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.


>From foo@baz Mon Dec 18 14:12:34 CET 2017
From: David Howells <dhowells@redhat.com>
Date: Thu, 16 Mar 2017 16:27:47 +0000
Subject: afs: Better abort and net error handling

From: David Howells <dhowells@redhat.com>


[ Upstream commit 70af0e3bd65142f9e674961c975451638a7ce1d5 ]

If we receive a network error, a remote abort or a protocol error whilst
we're still transmitting data, make sure we return an appropriate error to
the caller rather than ESHUTDOWN or ECONNABORTED.

Signed-off-by: David Howells <dhowells@redhat.com>
Signed-off-by: Sasha Levin <alexander.levin@verizon.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 fs/afs/rxrpc.c |   35 +++++++++++++++++++++++++++--------
 1 file changed, 27 insertions(+), 8 deletions(-)

--- a/fs/afs/rxrpc.c
+++ b/fs/afs/rxrpc.c
@@ -321,6 +321,8 @@ int afs_make_call(struct in_addr *addr,
 	struct rxrpc_call *rxcall;
 	struct msghdr msg;
 	struct kvec iov[1];
+	size_t offset;
+	u32 abort_code;
 	int ret;
 
 	_enter("%x,{%d},", addr->s_addr, ntohs(call->port));
@@ -368,9 +370,11 @@ int afs_make_call(struct in_addr *addr,
 	msg.msg_controllen	= 0;
 	msg.msg_flags		= (call->send_pages ? MSG_MORE : 0);
 
-	/* have to change the state *before* sending the last packet as RxRPC
-	 * might give us the reply before it returns from sending the
-	 * request */
+	/* We have to change the state *before* sending the last packet as
+	 * rxrpc might give us the reply before it returns from sending the
+	 * request.  Further, if the send fails, we may already have been given
+	 * a notification and may have collected it.
+	 */
 	if (!call->send_pages)
 		call->state = AFS_CALL_AWAIT_REPLY;
 	ret = rxrpc_kernel_send_data(afs_socket, rxcall,
@@ -389,7 +393,17 @@ int afs_make_call(struct in_addr *addr,
 	return wait_mode->wait(call);
 
 error_do_abort:
-	rxrpc_kernel_abort_call(afs_socket, rxcall, RX_USER_ABORT, -ret, "KSD");
+	call->state = AFS_CALL_COMPLETE;
+	if (ret != -ECONNABORTED) {
+		rxrpc_kernel_abort_call(afs_socket, rxcall, RX_USER_ABORT,
+					-ret, "KSD");
+	} else {
+		abort_code = 0;
+		offset = 0;
+		rxrpc_kernel_recv_data(afs_socket, rxcall, NULL, 0, &offset,
+				       false, &abort_code);
+		ret = call->type->abort_to_error(abort_code);
+	}
 error_kill_call:
 	afs_end_call(call);
 	_leave(" = %d", ret);
@@ -434,16 +448,18 @@ static void afs_deliver_to_call(struct a
 		case -EINPROGRESS:
 		case -EAGAIN:
 			goto out;
+		case -ECONNABORTED:
+			goto call_complete;
 		case -ENOTCONN:
 			abort_code = RX_CALL_DEAD;
 			rxrpc_kernel_abort_call(afs_socket, call->rxcall,
 						abort_code, -ret, "KNC");
-			goto do_abort;
+			goto save_error;
 		case -ENOTSUPP:
 			abort_code = RXGEN_OPCODE;
 			rxrpc_kernel_abort_call(afs_socket, call->rxcall,
 						abort_code, -ret, "KIV");
-			goto do_abort;
+			goto save_error;
 		case -ENODATA:
 		case -EBADMSG:
 		case -EMSGSIZE:
@@ -453,7 +469,7 @@ static void afs_deliver_to_call(struct a
 				abort_code = RXGEN_SS_UNMARSHAL;
 			rxrpc_kernel_abort_call(afs_socket, call->rxcall,
 						abort_code, EBADMSG, "KUM");
-			goto do_abort;
+			goto save_error;
 		}
 	}
 
@@ -464,8 +480,9 @@ out:
 	_leave("");
 	return;
 
-do_abort:
+save_error:
 	call->error = ret;
+call_complete:
 	call->state = AFS_CALL_COMPLETE;
 	goto done;
 }
@@ -513,6 +530,8 @@ static int afs_wait_for_call_to_complete
 		_debug("call incomplete");
 		rxrpc_kernel_abort_call(afs_socket, call->rxcall,
 					RX_CALL_DEAD, -ret, abort_why);
+	} else if (call->error < 0) {
+		ret = call->error;
 	}
 
 	_debug("call complete");


Patches currently in stable-queue which might be from dhowells@redhat.com are

queue-4.9/afs-flush-outstanding-writes-when-an-fd-is-closed.patch
queue-4.9/afs-fix-the-maths-in-afs_fs_store_data.patch
queue-4.9/afs-populate-group-id-from-vnode-status.patch
queue-4.9/afs-prevent-callback-expiry-timer-overflow.patch
queue-4.9/crypto-rsa-fix-buffer-overread-when-stripping-leading-zeroes.patch
queue-4.9/afs-adjust-mode-bits-processing.patch
queue-4.9/rxrpc-wake-up-the-transmitter-if-rx-window-size-increases-on-the-peer.patch
queue-4.9/afs-invalid-op-id-should-abort-with-rxgen_opcode.patch
queue-4.9/afs-fix-page-leak-in-afs_write_begin.patch
queue-4.9/afs-better-abort-and-net-error-handling.patch
queue-4.9/afs-fix-missing-put_page.patch
queue-4.9/afs-migrate-vlocation-fields-to-64-bit.patch
queue-4.9/rxrpc-ignore-busy-packets-on-old-calls.patch
queue-4.9/afs-populate-and-use-client-modification-time.patch
queue-4.9/afs-fix-afs_kill_pages.patch
queue-4.9/afs-fix-abort-on-signal-while-waiting-for-call-completion.patch