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Subject: media: rtl2832: use 64-bit arithmetic instead of 32-bit in
rtl2832_set_frontend
Author: Gustavo A. R. Silva <gust...@embeddedor.com>
Date: Tue Feb 6 11:46:59 2018 -0500
Add suffix ULL to constant 7 in order to give the compiler complete
information about the proper arithmetic to use. Notice that this
constant is used in a context that expects an expression of type
u64 (64 bits, unsigned).
The expression dev->pdata->clk * 7 is currently being evaluated
using 32-bit arithmetic.
Addresses-Coverity-ID: 1271223 ("Unintentional integer overflow")
Signed-off-by: Gustavo A. R. Silva <gust...@embeddedor.com>
Signed-off-by: Hans Verkuil <hans.verk...@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mche...@s-opensource.com>
drivers/media/dvb-frontends/rtl2832.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/drivers/media/dvb-frontends/rtl2832.c
b/drivers/media/dvb-frontends/rtl2832.c
index 94bf5b7d6f3f..fa3b8169c1a5 100644
--- a/drivers/media/dvb-frontends/rtl2832.c
+++ b/drivers/media/dvb-frontends/rtl2832.c
@@ -498,7 +498,7 @@ static int rtl2832_set_frontend(struct dvb_frontend *fe)
* RSAMP_RATIO = floor(CrystalFreqHz * 7 * pow(2, 22)
* / ConstWithBandwidthMode)
*/
- num = dev->pdata->clk * 7;
+ num = dev->pdata->clk * 7ULL;
num *= 0x400000;
num = div_u64(num, bw_mode);
resamp_ratio = num & 0x3ffffff;
@@ -511,7 +511,7 @@ static int rtl2832_set_frontend(struct dvb_frontend *fe)
* / (CrystalFreqHz * 7))
*/
num = bw_mode << 20;
- num2 = dev->pdata->clk * 7;
+ num2 = dev->pdata->clk * 7ULL;
num = div_u64(num, num2);
num = -num;
cfreq_off_ratio = num & 0xfffff;
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