Commit c2c65cd2 authored by Dan Carpenter's avatar Dan Carpenter Committed by Linus Torvalds

staging: ozwpan: prevent overflow in oz_cdev_write()

We need to check "count" so we don't overflow the ei->data buffer.
Reported-by: default avatarNico Golde <nico@ngolde.de>
Reported-by: default avatarFabian Yamaguchi <fabs@goesec.de>
Signed-off-by: default avatarDan Carpenter <dan.carpenter@oracle.com>
Cc: stable@kernel.org
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent 201f99f1
...@@ -155,6 +155,9 @@ static ssize_t oz_cdev_write(struct file *filp, const char __user *buf, ...@@ -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_app_hdr *app_hdr;
struct oz_serial_ctx *ctx; struct oz_serial_ctx *ctx;
if (count > sizeof(ei->data) - sizeof(*elt) - sizeof(*app_hdr))
return -EINVAL;
spin_lock_bh(&g_cdev.lock); spin_lock_bh(&g_cdev.lock);
pd = g_cdev.active_pd; pd = g_cdev.active_pd;
if (pd) if (pd)
......
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