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iio: dht11: Fix out-of-bounds read

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

Signed-off-by: Richard Weinberger <richard@nod.at>
Acked-by: Hartmut Knaack <knaack.h@gmx.de>
Acked-by: Harald Geyer <harald@ccbib.org>
Reviewed-by: Sanjeev Sharma <sanjeev_sharma@mentor.com>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>
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Richard Weinberger 2015-01-07 13:15:22 +01:00 committed by Jonathan Cameron
parent 8ecb55b849
commit ddc25bdd2b
1 changed files with 1 additions and 1 deletions
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2
drivers/iio/humidity/dht11.c
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@ -88,7 +88,7 @@ static int dht11_decode(struct dht11 *dht11, int offset)
unsigned char temp_int, temp_dec, hum_int, hum_dec, checksum; unsigned char temp_int, temp_dec, hum_int, hum_dec, checksum;
/* Calculate timestamp resolution */ /* 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; t = dht11->edges[i].ts - dht11->edges[i-1].ts;
if (t > 0 && t < timeres) if (t > 0 && t < timeres)
timeres = t; timeres = t;