linux-kernel - [07/40] wl12xx: Validate FEM index from ini file and FW

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Date:	Tue, 10 Jan 2012 13:45:20 -0800
From:	Greg KH <gregkh@...e.de>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:	torvalds@...ux-foundation.org, akpm@...ux-foundation.org,
	alan@...rguk.ukuu.org.uk, Pontus Fuchs <pontus.fuchs@...il.com>,
	Luciano Coelho <coelho@...com>
Subject: [07/40] wl12xx: Validate FEM index from ini file and FW

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

------------------

From: Pontus Fuchs <pontus.fuchs@...il.com>

commit 2131d3c2f99b081806fdae7662c92fe6acda52af upstream.

Check for out of bound FEM index to prevent reading beyond ini
memory end.

Signed-off-by: Pontus Fuchs <pontus.fuchs@...il.com>
Reviewed-by: Luciano Coelho <coelho@...com>
Signed-off-by: Luciano Coelho <coelho@...com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>

---
 drivers/net/wireless/wl12xx/cmd.c |   22 ++++++++++++++++++++++
 1 file changed, 22 insertions(+)

--- a/drivers/net/wireless/wl12xx/cmd.c
+++ b/drivers/net/wireless/wl12xx/cmd.c
@@ -121,6 +121,11 @@ int wl1271_cmd_general_parms(struct wl12
 	if (!wl->nvs)
 		return -ENODEV;
 
+	if (gp->tx_bip_fem_manufacturer >= WL1271_INI_FEM_MODULE_COUNT) {
+		wl1271_warning("FEM index from INI out of bounds");
+		return -EINVAL;
+	}
+
 	gen_parms = kzalloc(sizeof(*gen_parms), GFP_KERNEL);
 	if (!gen_parms)
 		return -ENOMEM;
@@ -144,6 +149,12 @@ int wl1271_cmd_general_parms(struct wl12
 	gp->tx_bip_fem_manufacturer =
 		gen_parms->general_params.tx_bip_fem_manufacturer;
 
+	if (gp->tx_bip_fem_manufacturer >= WL1271_INI_FEM_MODULE_COUNT) {
+		wl1271_warning("FEM index from FW out of bounds");
+		ret = -EINVAL;
+		goto out;
+	}
+
 	wl1271_debug(DEBUG_CMD, "FEM autodetect: %s, manufacturer: %d\n",
 		     answer ? "auto" : "manual", gp->tx_bip_fem_manufacturer);
 
@@ -163,6 +174,11 @@ int wl128x_cmd_general_parms(struct wl12
 	if (!wl->nvs)
 		return -ENODEV;
 
+	if (gp->tx_bip_fem_manufacturer >= WL1271_INI_FEM_MODULE_COUNT) {
+		wl1271_warning("FEM index from ini out of bounds");
+		return -EINVAL;
+	}
+
 	gen_parms = kzalloc(sizeof(*gen_parms), GFP_KERNEL);
 	if (!gen_parms)
 		return -ENOMEM;
@@ -187,6 +203,12 @@ int wl128x_cmd_general_parms(struct wl12
 	gp->tx_bip_fem_manufacturer =
 		gen_parms->general_params.tx_bip_fem_manufacturer;
 
+	if (gp->tx_bip_fem_manufacturer >= WL1271_INI_FEM_MODULE_COUNT) {
+		wl1271_warning("FEM index from FW out of bounds");
+		ret = -EINVAL;
+		goto out;
+	}
+
 	wl1271_debug(DEBUG_CMD, "FEM autodetect: %s, manufacturer: %d\n",
 		     answer ? "auto" : "manual", gp->tx_bip_fem_manufacturer);
 


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