linux-kernel - [PATCH] net: wireless: orinoco: orinoco

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Date:	Mon, 18 Feb 2013 03:37:44 -0800
From:	Kumar Amit Mehta <gmate.amit@...il.com>
To:	linville@...driver.com
Cc:	sarah.a.sharp@...ux.intel.com, dan.carpenter@...cle.com,
	linux-wireless@...r.kernel.org, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org
Subject: [PATCH] net: wireless: orinoco: orinoco_usb.c: fix DMA buffers on stack

This patch fixes an instance of DMA buffer on stack(being passed to
usb_control_msg) for the wireless USB version of the Agere Orinoco card driver.
It also fixes the missing audit for the return value of firmware download
routine. Found using smatch.

Signed-off-by: Kumar Amit Mehta <gmate.amit@...il.com>
---
 drivers/net/wireless/orinoco/orinoco_usb.c |   11 +++++++++--
 1 file changed, 9 insertions(+), 2 deletions(-)

diff --git a/drivers/net/wireless/orinoco/orinoco_usb.c b/drivers/net/wireless/orinoco/orinoco_usb.c
index 01624dc..7744f42 100644
--- a/drivers/net/wireless/orinoco/orinoco_usb.c
+++ b/drivers/net/wireless/orinoco/orinoco_usb.c
@@ -804,10 +804,15 @@ static inline int ezusb_8051_cpucs(struct ezusb_priv *upriv, int reset)
 static int ezusb_firmware_download(struct ezusb_priv *upriv,
 				   struct ez_usb_fw *fw)
 {
-	u8 fw_buffer[FW_BUF_SIZE];
+	u8 *fw_buffer;
 	int retval, addr;
 	int variant_offset;
 
+	fw_buffer = kmalloc(FW_BUF_SIZE, GFP_KERNEL);
+	if (!fw_buffer) {
+		printk(KERN_ERR PFX "Out of memory for firmware buffer.\n");
+		return -ENOMEM;
+	}
 	/*
 	 * This byte is 1 and should be replaced with 0.  The offset is
 	 * 0x10AD in version 0.0.6.  The byte in question should follow
@@ -859,6 +864,7 @@ static int ezusb_firmware_download(struct ezusb_priv *upriv,
 	printk(KERN_ERR PFX "Firmware download failed, error %d\n",
 	       retval);
  exit:
+	kfree(fw_buffer);
 	return retval;
 }
 
@@ -1681,7 +1687,8 @@ static int ezusb_probe(struct usb_interface *interface,
 		firmware.code = fw_entry->data;
 	}
 	if (firmware.size && firmware.code) {
-		ezusb_firmware_download(upriv, &firmware);
+		if (ezusb_firmware_download(upriv, &firmware))
+			goto error;
 	} else {
 		err("No firmware to download");
 		goto error;
-- 
1.7.9.5

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