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Subject[PATCH] net: wireless: orinoco: orinoco_usb.c: fix DMA buffers on stack
Date
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@gmail.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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