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>
mariux64 · Nov 29, 2011 · 5dc5503 · 5dc5503
1 parent 746ae30
commit 5dc5503
Showing 1 changed file with 3 additions and 0 deletions.
diff --git 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);