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media: ddbridge: fix possible buffer overflow in ddb_ports_init()

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Report from smatch:

  drivers/media/pci/ddbridge/ddbridge-core.c:2659 ddb_ports_init() error: buffer overflow 'dev->port' 32 <= u32max

Fix by making sure "p" is greater than zero before checking for
"dev->port[].type == DDB_CI_EXTERNAL_XO2".

Cc: Ralph Metzler <rjkm@metzlerbros.de>
Signed-off-by: Daniel Scheller <d.scheller@gmx.net>
Tested-by: Richard Scobie <r.scobie@clear.net.nz>
Tested-by: Jasmin Jessich <jasmin@anw.at>
Tested-by: Dietmar Spingler <d_spingler@freenet.de>
Tested-by: Manfred Knick <Manfred.Knick@t-online.de>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
This commit is contained in:
Daniel Scheller 2017-08-12 07:55:57 -04:00 committed by Mauro Carvalho Chehab
parent f597f2a8fc
commit 8ac9fd4348
1 changed files with 1 additions and 1 deletions
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2
drivers/media/pci/ddbridge/ddbridge-core.c
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@ -2551,7 +2551,7 @@ void ddb_ports_init(struct ddb *dev)
port->dvb[0].adap = &dev->adap[2 * p];
port->dvb[1].adap = &dev->adap[2 * p + 1];
if ((port->class == DDB_PORT_NONE) && i &&
if ((port->class == DDB_PORT_NONE) && i && p &&
dev->port[p - 1].type == DDB_CI_EXTERNAL_XO2) {
port->class = DDB_PORT_CI;
port->type = DDB_CI_EXTERNAL_XO2_B;