[PATCH 3.8 84/91] staging: ozwpan: prevent overflow in oz_cdev_write()

Kamal Mostafa kamal at canonical.com
Fri Nov 8 02:15:39 UTC 2013 -stable review patch.  If anyone has any objections, please let me know.


From: Dan Carpenter <dan.carpenter at oracle.com>

commit c2c65cd2e14ada6de44cb527e7f1990bede24e15 upstream.

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

Reported-by: Nico Golde <nico at ngolde.de>
Reported-by: Fabian Yamaguchi <fabs at goesec.de>
Signed-off-by: Dan Carpenter <dan.carpenter at oracle.com>
Signed-off-by: Linus Torvalds <torvalds at linux-foundation.org>
Signed-off-by: Kamal Mostafa <kamal at canonical.com>
 drivers/staging/ozwpan/ozcdev.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/staging/ozwpan/ozcdev.c b/drivers/staging/ozwpan/ozcdev.c
index 64913ae..f9c493b 100644
--- a/drivers/staging/ozwpan/ozcdev.c
+++ b/drivers/staging/ozwpan/ozcdev.c
@@ -152,6 +152,9 @@ ssize_t oz_cdev_write(struct file *filp, const char __user *buf, size_t count,
 	struct oz_app_hdr *app_hdr;
 	struct oz_serial_ctx *ctx;
+	if (count > sizeof(ei->data) - sizeof(*elt) - sizeof(*app_hdr))
+		return -EINVAL;
 	pd = g_cdev.active_pd;
 	if (pd)

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