From: Daniel Scheller <d.scheller.oss@gmail.com>
To: linux-media@vger.kernel.org, mchehab@kernel.org,
mchehab@s-opensource.com
Cc: r.scobie@clear.net.nz, jasmin@anw.at, d_spingler@freenet.de,
Manfred.Knick@t-online.de, rjkm@metzlerbros.de
Subject: [PATCH v3 05/12] [media] ddbridge: check pointers before dereferencing
Date: Wed, 9 Aug 2017 22:31:21 +0200 [thread overview]
Message-ID: <20170809203128.31476-6-d.scheller.oss@gmail.com> (raw)
In-Reply-To: <20170809203128.31476-1-d.scheller.oss@gmail.com>
From: Daniel Scheller <d.scheller@gmx.net>
Fixes two warnings reported by smatch:
drivers/media/pci/ddbridge/ddbridge-core.c:240 ddb_redirect() warn: variable dereferenced before check 'idev' (see line 238)
drivers/media/pci/ddbridge/ddbridge-core.c:240 ddb_redirect() warn: variable dereferenced before check 'pdev' (see line 238)
Fixed by moving the existing checks up before accessing members.
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>
---
drivers/media/pci/ddbridge/ddbridge-core.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/drivers/media/pci/ddbridge/ddbridge-core.c b/drivers/media/pci/ddbridge/ddbridge-core.c
index 08440dcb5e6f..12bc8de980b5 100644
--- a/drivers/media/pci/ddbridge/ddbridge-core.c
+++ b/drivers/media/pci/ddbridge/ddbridge-core.c
@@ -170,10 +170,10 @@ static int ddb_redirect(u32 i, u32 p)
struct ddb *pdev = ddbs[(p >> 4) & 0x3f];
struct ddb_port *port;
- if (!idev->has_dma || !pdev->has_dma)
- return -EINVAL;
if (!idev || !pdev)
return -EINVAL;
+ if (!idev->has_dma || !pdev->has_dma)
+ return -EINVAL;
port = &pdev->port[p & 0x0f];
if (!port->output)
--
2.13.0
next prev parent reply other threads:[~2017-08-09 20:31 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-08-09 20:31 [PATCH v3 00/12] ddbridge: bump to ddbridge-0.9.29 Daniel Scheller
2017-08-09 20:31 ` [PATCH v3 01/12] [media] ddbridge: bump ddbridge code to version 0.9.29 Daniel Scheller
2017-08-09 20:31 ` [PATCH v3 02/12] [media] ddbridge: split I/O related functions off from ddbridge.h Daniel Scheller
2017-08-09 20:31 ` [PATCH v3 03/12] [media] ddbridge: split off IRQ handling Daniel Scheller
2017-08-09 20:31 ` [PATCH v3 04/12] [media] ddbridge: split off hardware definitions and mappings Daniel Scheller
2017-08-09 20:31 ` Daniel Scheller [this message]
2017-08-09 20:31 ` [PATCH v3 06/12] [media] ddbridge: only register frontends in fe2 if fe is not NULL Daniel Scheller
2017-08-09 20:31 ` [PATCH v3 07/12] [media] ddbridge: fix possible buffer overflow in ddb_ports_init() Daniel Scheller
2017-08-09 20:31 ` [PATCH v3 08/12] [media] ddbridge: remove unreachable code Daniel Scheller
2017-08-09 20:31 ` [PATCH v3 09/12] [media] ddbridge: fix impossible condition warning Daniel Scheller
2017-08-09 20:31 ` [PATCH v3 10/12] [media] ddbridge: fix dereference before check Daniel Scheller
2017-08-09 20:31 ` [PATCH v3 11/12] [media] ddbridge: Kconfig option to control the MSI modparam default Daniel Scheller
2017-08-09 20:31 ` [PATCH v3 12/12] [media] MAINTAINERS: add entry for ddbridge Daniel Scheller
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