We need to check "count" so we don't overflow the ei->data buffer.
Reported-by: Nico Golde <n...@ngolde.de>
Reported-by: Fabian Yamaguchi <f...@goesec.de>
Signed-off-by: Dan Carpenter <dan.carpen...@oracle.com>
diff --git a/drivers/staging/ozwpan/ozcdev.c b/drivers/staging/ozwpan/ozcdev.c
index 6ccb64f..6ce0af9 100644
--- a/drivers/staging/ozwpan/ozcdev.c
+++ b/drivers/staging/ozwpan/ozcdev.c
@@ -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)
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