From: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>
To: Linux Media Mailing List <linux-media@vger.kernel.org>
Cc: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>,
Mauro Carvalho Chehab <mchehab@infradead.org>,
Sakari Ailus <sakari.ailus@linux.intel.com>,
Akinobu Mita <akinobu.mita@gmail.com>,
Sylwester Nawrocki <s.nawrocki@samsung.com>
Subject: [PATCH 4/7] media: ov9650: add a sanity check
Date: Thu, 22 Aug 2019 16:39:31 -0300 [thread overview]
Message-ID: <2868a99c83f1cfef93058f7e49aefa4b104b644f.1566502743.git.mchehab+samsung@kernel.org> (raw)
In-Reply-To: <4a411ba155eb062b6575aba0824123c840806c0b.1566502743.git.mchehab+samsung@kernel.org>
As pointed by cppcheck:
[drivers/media/i2c/ov9650.c:706]: (error) Shifting by a negative value is undefined behaviour
[drivers/media/i2c/ov9650.c:707]: (error) Shifting by a negative value is undefined behaviour
[drivers/media/i2c/ov9650.c:721]: (error) Shifting by a negative value is undefined behaviour
Prevent mangling with gains with invalid values
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>
---
drivers/media/i2c/ov9650.c | 5 +++++
1 file changed, 5 insertions(+)
diff --git a/drivers/media/i2c/ov9650.c b/drivers/media/i2c/ov9650.c
index 8b56011446a9..cb49fda902fd 100644
--- a/drivers/media/i2c/ov9650.c
+++ b/drivers/media/i2c/ov9650.c
@@ -703,6 +703,11 @@ static int ov965x_set_gain(struct ov965x *ov965x, int auto_gain)
for (m = 6; m >= 0; m--)
if (gain >= (1 << m) * 16)
break;
+
+ /* Sanity check: don't adjust the gain with a negative val */
+ if (m < 0)
+ return -EINVAL;
+
rgain = (gain - ((1 << m) * 16)) / (1 << m);
rgain |= (((1 << m) - 1) << 4);
--
2.21.0
next prev parent reply other threads:[~2019-08-22 19:39 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-08-22 19:39 [PATCH 1/7] media: remove include stdarg.h from some drivers Mauro Carvalho Chehab
2019-08-22 19:39 ` [PATCH 2/7] media: vicodec: make life easier for static analyzers Mauro Carvalho Chehab
2019-08-22 19:39 ` [PATCH 3/7] media: aspeed-video: address a protential usage of an unit var Mauro Carvalho Chehab
2019-08-26 15:12 ` Eddie James
2019-08-22 19:39 ` Mauro Carvalho Chehab [this message]
2019-08-23 10:33 ` [PATCH 4/7] media: ov9650: add a sanity check Sylwester Nawrocki
2019-08-22 19:39 ` [PATCH 5/7] media: use the BIT() macro Mauro Carvalho Chehab
2019-08-23 0:08 ` Laurent Pinchart
2019-08-23 9:47 ` [PATCH v2 " Mauro Carvalho Chehab
2019-08-23 10:22 ` Sylwester Nawrocki
2019-08-23 12:12 ` Benoit Parrot
2019-08-23 20:45 ` Laurent Pinchart
2019-08-22 19:39 ` [PATCH 6/7] media: don't do an unsigned int with a 31 bit shift Mauro Carvalho Chehab
2019-08-23 9:08 ` Marc Gonzalez
2019-08-23 10:20 ` Mauro Carvalho Chehab
2019-08-23 11:09 ` Marc Gonzalez
2019-08-29 17:03 ` Kees Cook
2019-08-22 19:39 ` [PATCH 7/7] media: ngene: don't try to memcpy from NULL Mauro Carvalho Chehab
2019-08-22 19:43 ` Mauro Carvalho Chehab
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