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Subject[PATCH 3.5 28/78] staging: ozwpan: prevent overflow in oz_cdev_write()
Date
3.5.7.26 -stable review patch.  If anyone has any objections, please let me know.

------------------

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

commit c2c65cd2e14ada6de44cb527e7f1990bede24e15 upstream.

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>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Luis Henriques <luis.henriques@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 27325f7..03dcd1b 100644
--- a/drivers/staging/ozwpan/ozcdev.c
+++ b/drivers/staging/ozwpan/ozcdev.c
@@ -150,6 +150,9 @@ 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;
+
spin_lock_bh(&g_cdev.lock);
pd = g_cdev.active_pd;
if (pd)
--
1.8.3.2


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