[PATCH AUTOSEL for 4.14 52/64] afs: Fix total-length calculation for multiple-page send

[alexander . levin]

From: David Howells <dhowells@xxxxxxxxxx>

[ Upstream commit 1199db603511d7463d9d3840f96f61967affc766 ]

Fix the total-length calculation in afs_make_call() when the operation
being dispatched has data from a series of pages attached.

Despite the patched code looking like that it should reduce mathematically
to the current code, it doesn't because the 32-bit unsigned arithmetic
being used to calculate the page-offset-difference doesn't correctly extend
to a 64-bit value when the result is effectively negative.

Without this, some FS.StoreData operations that span multiple pages fail,
reporting too little or too much data.

Signed-off-by: David Howells <dhowells@xxxxxxxxxx>
Signed-off-by: Sasha Levin <alexander.levin@xxxxxxxxxxx>
---
 fs/afs/rxrpc.c | 13 +++++++++++--
 1 file changed, 11 insertions(+), 2 deletions(-)

diff --git a/fs/afs/rxrpc.c b/fs/afs/rxrpc.c
index 0bf191f0dbaf..9f715c3edcf9 100644
--- a/fs/afs/rxrpc.c
+++ b/fs/afs/rxrpc.c
@@ -377,8 +377,17 @@ int afs_make_call(struct in_addr *addr, struct afs_call *call, gfp_t gfp,
 	 */
 	tx_total_len = call->request_size;
 	if (call->send_pages) {
-		tx_total_len += call->last_to - call->first_offset;
-		tx_total_len += (call->last - call->first) * PAGE_SIZE;
+		if (call->last == call->first) {
+			tx_total_len += call->last_to - call->first_offset;
+		} else {
+			/* It looks mathematically like you should be able to
+			 * combine the following lines with the ones above, but
+			 * unsigned arithmetic is fun when it wraps...
+			 */
+			tx_total_len += PAGE_SIZE - call->first_offset;
+			tx_total_len += call->last_to;
+			tx_total_len += (call->last - call->first - 1) * PAGE_SIZE;
+		}
 	}
 
 	/* create a call */
-- 
2.11.0