linux-kernel - [PATCH] gigaset: gigaset_isowbuf_getbytes() may return signed unnoticed

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Message-Id: <20080510175234.6927811006C@xenon.ts.pxnet.com>
Date:	Sat, 10 May 2008 19:52:34 +0200 (CEST)
From:	Tilman Schmidt <tilman@...p.cc>
To:	Andrew Morton <akpm@...ux-foundation.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	ISDN4Linux Developer Mailing List 
	<i4ldeveloper@...tserv.isdn4linux.de>
CC:	Hansjoerg Lipp <hjlipp@....de>, Roel Kluin <12o3l@...cali.nl>
Subject: [PATCH] gigaset: gigaset_isowbuf_getbytes() may return signed unnoticed

ifd->offset is unsigned. gigaset_isowbuf_getbytes() may return signed unnoticed.
Revised version of patch originally submitted by Roel Kluin <12o3l@...cali.nl>.

Signed-off-by: Tilman Schmidt <tilman@...p.cc>
---
 drivers/isdn/gigaset/bas-gigaset.c |   12 ++++++------
 1 files changed, 6 insertions(+), 6 deletions(-)

diff --git a/drivers/isdn/gigaset/bas-gigaset.c b/drivers/isdn/gigaset/bas-gigaset.c
index 5255b5e..3f11910 100644
--- a/drivers/isdn/gigaset/bas-gigaset.c
+++ b/drivers/isdn/gigaset/bas-gigaset.c
@@ -1050,10 +1050,9 @@ static int submit_iso_write_urb(struct isow_urbctx_t *ucx)
 		}
 
 		/* retrieve block of data to send */
-		ifd->offset = gigaset_isowbuf_getbytes(ubc->isooutbuf,
-						       ifd->length);
-		if (ifd->offset < 0) {
-			if (ifd->offset == -EBUSY) {
+		rc = gigaset_isowbuf_getbytes(ubc->isooutbuf, ifd->length);
+		if (rc < 0) {
+			if (rc == -EBUSY) {
 				gig_dbg(DEBUG_ISO,
 					"%s: buffer busy at frame %d",
 					__func__, nframe);
@@ -1062,11 +1061,12 @@ static int submit_iso_write_urb(struct isow_urbctx_t *ucx)
 			} else {
 				dev_err(ucx->bcs->cs->dev,
 					"%s: buffer error %d at frame %d\n",
-					__func__, ifd->offset, nframe);
-				return ifd->offset;
+					__func__, rc, nframe);
+				return rc;
 			}
 			break;
 		}
+		ifd->offset = rc;
 		ucx->limit = ubc->isooutbuf->nextread;
 		ifd->status = 0;
 		ifd->actual_length = 0;
-- 
1.5.4.7.gd8534-dirty

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