diff mbox

[media] dvb: si21xx: buffer overflow in si21_writeregs()

Message ID 20140909120528.GA19760@mwanda (mailing list archive)
State Accepted, archived
Headers

Commit Message

Dan Carpenter Sept. 9, 2014, 12:05 p.m. UTC 
  "len" is user controlled and can be up to 255.  Anything more than 59
will cause a buffer overflow so we need to add a test for that.

Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>

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diff mbox

Patch

diff --git a/drivers/media/dvb-frontends/si21xx.c b/drivers/media/dvb-frontends/si21xx.c
index 73b47cc..16850e2 100644
--- a/drivers/media/dvb-frontends/si21xx.c
+++ b/drivers/media/dvb-frontends/si21xx.c
@@ -236,6 +236,9 @@  static int si21_writeregs(struct si21xx_state *state, u8 reg1,
 				.len = len + 1
 	};
 
+	if (len > sizeof(buf) - 1)
+		return -EINVAL;
+
 	msg.buf[0] =  reg1;
 	memcpy(msg.buf + 1, data, len);