From: Dan Carpenter <dan.carpenter@oracle.com>
To: Mauro Carvalho Chehab <m.chehab@samsung.com>
Cc: linux-media@vger.kernel.org, kernel-janitors@vger.kernel.org
Subject: [patch] [media] dvb: si21xx: buffer overflow in si21_writeregs()
Date: Tue, 9 Sep 2014 15:05:28 +0300 [thread overview]
Message-ID: <20140909120528.GA19760@mwanda> (raw)
"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>
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);
reply other threads:[~2014-09-09 12:05 UTC|newest]
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