linux-kernel - [PATCH 3.16.y-ckt 09/17] ipr: Fix regression when loading firmware

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Date:	Tue, 12 Apr 2016 19:07:56 +0100
From:	Luis Henriques <luis.henriques@...onical.com>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org,
	kernel-team@...ts.ubuntu.com
Cc:	Gabriel Krisman Bertazi <krisman@...ux.vnet.ibm.com>,
	Insu Yun <wuninsu@...il.com>,
	"Martin K. Petersen" <martin.petersen@...cle.com>,
	Ben Hutchings <ben@...adent.org.uk>,
	Luis Henriques <luis.henriques@...onical.com>
Subject: [PATCH 3.16.y-ckt 09/17] ipr: Fix regression when loading firmware

3.16.7-ckt27 -stable review patch.  If anyone has any objections, please let me know.

---8<------------------------------------------------------------

From: Gabriel Krisman Bertazi <krisman@...ux.vnet.ibm.com>

commit 21b81716c6bff24cda52dc75588455f879ddbfe9 upstream.

Commit d63c7dd5bcb9 ("ipr: Fix out-of-bounds null overwrite") removed
the end of line handling when storing the update_fw sysfs attribute.
This changed the userpace API because it started refusing writes
terminated by a line feed, which broke the update tools we already have.

This patch re-adds that handling, so both a write terminated by a line
feed or not can make it through with the update.

Fixes: d63c7dd5bcb9 ("ipr: Fix out-of-bounds null overwrite")
Signed-off-by: Gabriel Krisman Bertazi <krisman@...ux.vnet.ibm.com>
Cc: Insu Yun <wuninsu@...il.com>
Acked-by: Brian King <brking@...ux.vnet.ibm.com>
Signed-off-by: Martin K. Petersen <martin.petersen@...cle.com>
Cc: Ben Hutchings <ben@...adent.org.uk>
Signed-off-by: Luis Henriques <luis.henriques@...onical.com>
---
 drivers/scsi/ipr.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/scsi/ipr.c b/drivers/scsi/ipr.c
index 824e66d7bf93..de2bfa24b91a 100644
--- a/drivers/scsi/ipr.c
+++ b/drivers/scsi/ipr.c
@@ -3984,6 +3984,7 @@ static ssize_t ipr_store_update_fw(struct device *dev,
 	struct ipr_sglist *sglist;
 	char fname[100];
 	char *src;
+	char *endline;
 	int result, dnld_size;
 
 	if (!capable(CAP_SYS_ADMIN))
@@ -3991,6 +3992,10 @@ static ssize_t ipr_store_update_fw(struct device *dev,
 
 	snprintf(fname, sizeof(fname), "%s", buf);
 
+	endline = strchr(fname, '\n');
+	if (endline)
+		*endline = '\0';
+
 	if (request_firmware(&fw_entry, fname, &ioa_cfg->pdev->dev)) {
 		dev_err(&ioa_cfg->pdev->dev, "Firmware file %s not found\n", fname);
 		return -EIO;