From: Dan Carpenter <dan.carpenter@oracle.com>
To: Robert Foss <robert.foss@linaro.org>,
Andrey Konovalov <andrey.konovalov@linaro.org>
Cc: Todor Tomov <todor.too@gmail.com>, Andy Gross <agross@kernel.org>,
Bjorn Andersson <bjorn.andersson@linaro.org>,
Mauro Carvalho Chehab <mchehab@kernel.org>,
Hans Verkuil <hverkuil-cisco@xs4all.nl>,
linux-media@vger.kernel.org, kernel-janitors@vger.kernel.org
Subject: [PATCH 1/2] media: camss: Fix signedness bug in video_enum_fmt()
Date: Wed, 9 Dec 2020 09:50:34 +0300 [thread overview]
Message-ID: <X9BzujGgPAM/s+rG@mwanda> (raw)
This test has a problem because we want to know if "k" is -1 or a
positive value less than "f->index". But the "f->index" variable is a
u32 so if "k == -1" then -1 gets type promoted to UINT_MAX which is
larger than "f->index". I've added an explicit test to check for -1.
Fixes: a3d412d4b9f3 ("media: Revert "media: camss: Make use of V4L2_CAP_IO_MC"")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
---
I could equally well have casted "k < (int)f->index" but I feel like
this is more explicit and readable.
drivers/media/platform/qcom/camss/camss-video.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/media/platform/qcom/camss/camss-video.c b/drivers/media/platform/qcom/camss/camss-video.c
index bd9334af1c73..2fa3214775d5 100644
--- a/drivers/media/platform/qcom/camss/camss-video.c
+++ b/drivers/media/platform/qcom/camss/camss-video.c
@@ -579,7 +579,7 @@ static int video_enum_fmt(struct file *file, void *fh, struct v4l2_fmtdesc *f)
break;
}
- if (k < f->index)
+ if (k == -1 || k < f->index)
/*
* All the unique pixel formats matching the arguments
* have been enumerated (k >= 0 and f->index > 0), or
--
2.29.2
next reply other threads:[~2020-12-09 6:52 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-12-09 6:50 Dan Carpenter [this message]
2020-12-09 6:51 ` [PATCH 2/2] media: camss: missing error code in msm_video_register() Dan Carpenter
2020-12-09 10:56 ` Robert Foss
2020-12-09 10:55 ` [PATCH 1/2] media: camss: Fix signedness bug in video_enum_fmt() Robert Foss
2020-12-09 22:04 ` Andrey Konovalov
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