linux-kernel - [PATCH 4.9 03/28] staging: greybus: power_supply: fix prop-descriptor request size

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Message-Id: <20190509181250.816103692@linuxfoundation.org>
Date:   Thu,  9 May 2019 20:41:55 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Rui Miguel Silva <rui.silva@...aro.org>,
        Johan Hovold <johan@...nel.org>,
        Rui Miguel Silva <rmfrfs@...il.com>
Subject: [PATCH 4.9 03/28] staging: greybus: power_supply: fix prop-descriptor request size

From: Johan Hovold <johan@...nel.org>

commit 47830c1127ef166af787caf2f871f23089610a7f upstream.

Since moving the message buffers off the stack, the dynamically
allocated get-prop-descriptor request buffer is incorrectly sized due to
using the pointer rather than request-struct size when creating the
operation.

Fortunately, the pointer size is always larger than this one-byte
request, but this could still cause trouble on the remote end due to the
unexpected message size.

Fixes: 9d15134d067e ("greybus: power_supply: rework get descriptors")
Cc: stable <stable@...r.kernel.org>     # 4.9
Cc: Rui Miguel Silva <rui.silva@...aro.org>
Signed-off-by: Johan Hovold <johan@...nel.org>
Reviewed-by: Rui Miguel Silva <rmfrfs@...il.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/staging/greybus/power_supply.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/staging/greybus/power_supply.c
+++ b/drivers/staging/greybus/power_supply.c
@@ -521,7 +521,7 @@ static int gb_power_supply_prop_descript
 
 	op = gb_operation_create(connection,
 				 GB_POWER_SUPPLY_TYPE_GET_PROP_DESCRIPTORS,
-				 sizeof(req), sizeof(*resp) + props_count *
+				 sizeof(*req), sizeof(*resp) + props_count *
 				 sizeof(struct gb_power_supply_props_desc),
 				 GFP_KERNEL);
 	if (!op)