linux-kernel - [PATCH 4/4] iio: dht11: Fix out-of-bounds read

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Date:	Wed,  3 Dec 2014 00:32:56 +0100
From:	Richard Weinberger <richard@....at>
To:	jic23@...nel.org
Cc:	harald@...ib.org, knaack.h@....de, lars@...afoo.de,
	pmeerw@...erw.net, sanjeev_sharma@...tor.com,
	linux-iio@...r.kernel.org, linux-kernel@...r.kernel.org,
	Richard Weinberger <richard@....at>
Subject: [PATCH 4/4] iio: dht11: Fix out-of-bounds read

As we access i-1 we must not start with i=0.

Signed-off-by: Richard Weinberger <richard@....at>
---
 drivers/iio/humidity/dht11.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/iio/humidity/dht11.c b/drivers/iio/humidity/dht11.c
index fbcd7cb..5dfe71b 100644
--- a/drivers/iio/humidity/dht11.c
+++ b/drivers/iio/humidity/dht11.c
@@ -90,7 +90,7 @@ static int dht11_decode(struct dht11 *dht11, int offset)
 	unsigned char temp_int, temp_dec, hum_int, hum_dec, checksum;
 
 	/* Calculate timestamp resolution */
-	for (i = 0; i < dht11->num_edges; ++i) {
+	for (i = 1; i < dht11->num_edges; ++i) {
 		t = dht11->edges[i].ts - dht11->edges[i-1].ts;
 		if (t > 0 && t < timeres)
 			timeres = t;
-- 
1.8.4.5

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