linux-kernel - [PATCH 3/5] pcmcia: Fix requery

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Message-ID: <20141204212933.1351.53861.stgit@localhost.localdomain>
Date:	Thu, 04 Dec 2014 21:30:00 +0000
From:	Alan Cox <alan@...ux.intel.com>
To:	linux-kernel@...r.kernel.org, linux-pcmica@...ts.infradead.org
Subject: [PATCH 3/5] pcmcia: Fix requery

The requery logic goes off and attempts to read the CIS of empty slots. In
most cases this happens not to do any harm - but not all!

Add the missing check and also a WARN() to catch any other offenders.

Signed-off-by: Alan Cox <alan@...ux.intel.com>
---
 drivers/pcmcia/cistpl.c |    2 +-
 drivers/pcmcia/ds.c     |    3 +++
 2 files changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/pcmcia/cistpl.c b/drivers/pcmcia/cistpl.c
index 4ff725c..8b3b492 100644
--- a/drivers/pcmcia/cistpl.c
+++ b/drivers/pcmcia/cistpl.c
@@ -1386,7 +1386,7 @@ int pccard_validate_cis(struct pcmcia_socket *s, unsigned int *info)
 	if (!s)
 		return -EINVAL;
 
-	if (s->functions) {
+	if (s->functions || !(s->state & SOCKET_PRESENT)) {
 		WARN_ON(1);
 		return -EINVAL;
 	}
diff --git a/drivers/pcmcia/ds.c b/drivers/pcmcia/ds.c
index 757119b..d3baf0b 100644
--- a/drivers/pcmcia/ds.c
+++ b/drivers/pcmcia/ds.c
@@ -667,6 +667,9 @@ static void pcmcia_requery(struct pcmcia_socket *s)
 {
 	int has_pfc;
 
+	if (!(s->state & SOCKET_PRESENT))
+		return;
+
 	if (s->functions == 0) {
 		pcmcia_card_add(s);
 		return;

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