[PATCH 10/22] USB: fix oops in usb_sg_init()

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From: Alan Stern <stern@xxxxxxxxxxxxxxxxxxx>

This patch (as1401) fixes a bug in usb_sg_init() that can cause an
invalid pointer dereference.  An inner loop reuses some local variables
in an unsafe manner, so new variables are introduced.

Signed-off-by: Alan Stern <stern@xxxxxxxxxxxxxxxxxxx>
Tested-by: Ajay Kumar Gupta <ajay.gupta@xxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxx>
---
 drivers/usb/core/message.c |    7 +++++--
 1 files changed, 5 insertions(+), 2 deletions(-)

diff --git a/drivers/usb/core/message.c b/drivers/usb/core/message.c
index a73e08f..fd4c36e 100644
--- a/drivers/usb/core/message.c
+++ b/drivers/usb/core/message.c
@@ -416,8 +416,11 @@ int usb_sg_init(struct usb_sg_request *io, struct usb_device *dev,
 			/* A length of zero means transfer the whole sg list */
 			len = length;
 			if (len == 0) {
-				for_each_sg(sg, sg, nents, i)
-					len += sg->length;
+				struct scatterlist	*sg2;
+				int			j;
+
+				for_each_sg(sg, sg2, nents, j)
+					len += sg2->length;
 			}
 		} else {
 			/*
-- 
1.7.1

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