From: Alan Cox <alan@linux.intel.com>
Date: Wed, 10 Dec 2014 15:06:10 +0000 (+0000)
Subject: pcmcia cis: on an out of range CIS read return 0xff, don't just warn
X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=b38a4bd319e615b4eb4be9d8c0d5ddc13113c768;p=linux-beck.git

pcmcia cis: on an out of range CIS read return 0xff, don't just warn

The current code displays warnings but then proceeds to try and reference
the data through the PCMCIA window. Instead return 0xff. This prevents bogus
CIS data sending us off into hyperspace.

Signed-off-by: Alan Cox <alan@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---

diff --git a/drivers/pcmcia/cistpl.c b/drivers/pcmcia/cistpl.c
index 884a984216fe..4ff725ca2c74 100644
--- a/drivers/pcmcia/cistpl.c
+++ b/drivers/pcmcia/cistpl.c
@@ -168,9 +168,12 @@ int pcmcia_read_cis_mem(struct pcmcia_socket *s, int attr, u_int addr,
 	} else {
 		u_int inc = 1, card_offset, flags;
 
-		if (addr > CISTPL_MAX_CIS_SIZE)
+		if (addr > CISTPL_MAX_CIS_SIZE) {
 			dev_dbg(&s->dev,
 				"attempt to read CIS mem at addr %#x", addr);
+			memset(ptr, 0xff, len);
+			return -1;
+		}
 
 		flags = MAP_ACTIVE | ((cis_width) ? MAP_16BIT : 0);
 		if (attr) {