disable FB

hc

2024-01-04 1543e317f1da31b75942316931e8f491a8920811

 kernel/drivers/media/usb/dvb-usb-v2/ec168.c
..
..
@@ -115,6 +115,10 @@
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 	while (i < num) {
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 		if (num > i + 1 && (msg[i+1].flags & I2C_M_RD)) {
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 			if (msg[i].addr == ec168_ec100_config.demod_address) {
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+				if (msg[i].len < 1) {
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+					i = -EOPNOTSUPP;
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+					break;
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+				}
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 				req.cmd = READ_DEMOD;
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 				req.value = 0;
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 				req.index = 0xff00 + msg[i].buf[0]; /* reg */
..
..
@@ -131,6 +135,10 @@
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 			}
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 		} else {
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 			if (msg[i].addr == ec168_ec100_config.demod_address) {
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+				if (msg[i].len < 1) {
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+					i = -EOPNOTSUPP;
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+					break;
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+				}
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 				req.cmd = WRITE_DEMOD;
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 				req.value = msg[i].buf[1]; /* val */
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 				req.index = 0xff00 + msg[i].buf[0]; /* reg */
..
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@@ -139,6 +147,10 @@
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 				ret = ec168_ctrl_msg(d, &req);
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 				i += 1;
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 			} else {
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+				if (msg[i].len < 1) {
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+					i = -EOPNOTSUPP;
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+					break;
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+				}
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 				req.cmd = WRITE_I2C;
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 				req.value = msg[i].buf[0]; /* val */
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 				req.index = 0x0100 + msg[i].addr; /* I2C addr */