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staging: ozwpan: prevent overflow in oz_cdev_write()

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We need to check "count" so we don't overflow the ei->data buffer.

Reported-by: Nico Golde <nico@ngolde.de>
Reported-by: Fabian Yamaguchi <fabs@goesec.de>
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Cc: stable@kernel.org
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Dan Carpenter 2013-10-29 22:07:47 +03:00 committed by Linus Torvalds
parent 201f99f170
commit c2c65cd2e1
1 changed files with 3 additions and 0 deletions
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3
drivers/staging/ozwpan/ozcdev.c
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@ -155,6 +155,9 @@ static ssize_t oz_cdev_write(struct file *filp, const char __user *buf,
struct oz_app_hdr *app_hdr;
struct oz_serial_ctx *ctx;
if (count > sizeof(ei->data) - sizeof(*elt) - sizeof(*app_hdr))
return -EINVAL;
spin_lock_bh(&g_cdev.lock);
pd = g_cdev.active_pd;
if (pd)