[PATCH 3.2 11/27] [media] ttusb-dec: buffer overflow in ioctl

From: Ben Hutchings
Date: Sun Dec 28 2014 - 20:12:20 EST


3.2.66-rc1 review patch. If anyone has any objections, please let me know.

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

From: Dan Carpenter <dan.carpenter@xxxxxxxxxx>

commit f2e323ec96077642d397bb1c355def536d489d16 upstream.

We need to add a limit check here so we don't overflow the buffer.

Signed-off-by: Dan Carpenter <dan.carpenter@xxxxxxxxxx>
Signed-off-by: Mauro Carvalho Chehab <mchehab@xxxxxxxxxxxxxxx>
[bwh: Backported to 3.2: adjust filename]
Signed-off-by: Ben Hutchings <ben@xxxxxxxxxxxxxxx>
---
drivers/media/dvb/ttusb-dec/ttusbdecfe.c | 3 +++
1 file changed, 3 insertions(+)

--- a/drivers/media/dvb/ttusb-dec/ttusbdecfe.c
+++ b/drivers/media/dvb/ttusb-dec/ttusbdecfe.c
@@ -154,6 +154,9 @@ static int ttusbdecfe_dvbs_diseqc_send_m
0x00, 0x00, 0x00, 0x00,
0x00, 0x00 };

+ if (cmd->msg_len > sizeof(b) - 4)
+ return -EINVAL;
+
memcpy(&b[4], cmd->msg, cmd->msg_len);

state->config->send_command(fe, 0x72,

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