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[media] af9013: Don't accept invalid bandwidth

If userspace sends an invalid bandwidth, it should either return
EINVAL or switch to auto mode.

This driver will go past an array and program the hardware on a
wrong way if this happens.

Cc: stable@vger.kernel.org
Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>
Mauro Carvalho Chehab 10 年之前
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共有 1 个文件被更改,包括 4 次插入0 次删除
  1. 4 0
      drivers/media/dvb-frontends/af9013.c

+ 4 - 0
drivers/media/dvb-frontends/af9013.c

@@ -605,6 +605,10 @@ static int af9013_set_frontend(struct dvb_frontend *fe)
 			}
 		}
 
+		/* Return an error if can't find bandwidth or the right clock */
+		if (i == ARRAY_SIZE(coeff_lut))
+			return -EINVAL;
+
 		ret = af9013_wr_regs(state, 0xae00, coeff_lut[i].val,
 			sizeof(coeff_lut[i].val));
 	}