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wl12xx: fix potential buffer overflow in testmode nvs push 

We were allocating the size of the NVS file struct and not checking
whether the length of the buffer passed was correct before copying it
into the allocated memory.  This is a security hole because buffer
overflows can occur if the userspace passes a bigger file than what is
expected.

With this patch, we check if the size of the data passed from
userspace matches the size required.

This bug was introduced in 2.6.36.

Cc: stable@kernel.org
Reported-by: Ido Yariv <ido@wizery.com>
Signed-off-by: Luciano Coelho <coelho@ti.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
This commit is contained in:
Luciano Coelho 2011-04-01 19:42:02 +03:00 committed by John W. Linville
parent 023535732f
commit 09b661b332
1 changed files with 4 additions and 1 deletions
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5
drivers/net/wireless/wl12xx/testmode.c
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@ -204,7 +204,10 @@ static int wl1271_tm_cmd_nvs_push(struct wl1271 *wl, struct nlattr *tb[])
kfree(wl->nvs);
wl->nvs = kzalloc(sizeof(struct wl1271_nvs_file), GFP_KERNEL);
if (len != sizeof(struct wl1271_nvs_file))
return -EINVAL;
wl->nvs = kzalloc(len, GFP_KERNEL);
if (!wl->nvs) {
wl1271_error("could not allocate memory for the nvs file");
ret = -ENOMEM;