From: Dan Carpenter <dan.carpenter@oracle.com>
Date: Thu, 24 Nov 2011 02:42:09 +0000 (+0000)
Subject: isdn: avoid copying too long drvid
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=5dc5503f5a400be5a7dc611745a034f04b0679b8;p=GitHub%2FLineageOS%2Fandroid_kernel_motorola_exynos9610.git

isdn: avoid copying too long drvid

"cfg->drvid" comes from the user so there is a possibility they
didn't NUL terminate it properly.

Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
---

diff --git a/drivers/isdn/i4l/isdn_net.c b/drivers/isdn/i4l/isdn_net.c
index 1f73d7f7e024..2339d7396b9e 100644
--- a/drivers/isdn/i4l/isdn_net.c
+++ b/drivers/isdn/i4l/isdn_net.c
@@ -2756,6 +2756,9 @@ isdn_net_setcfg(isdn_net_ioctl_cfg * cfg)
 			char *c,
 			*e;
 
+			if (strnlen(cfg->drvid, sizeof(cfg->drvid)) ==
+					sizeof(cfg->drvid))
+				return -EINVAL;
 			drvidx = -1;
 			chidx = -1;
 			strcpy(drvid, cfg->drvid);