From: Dan Carpenter <dan.carpenter@oracle.com>
To: Zhang Rui <rui.zhang@intel.com>, Takashi Iwai <tiwai@suse.de>
Cc: Daniel Lezcano <daniel.lezcano@linaro.org>,
Amit Kucheria <amitk@kernel.org>,
Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>,
Sumeet Pawnikar <sumeet.r.pawnikar@intel.com>,
linux-pm@vger.kernel.org, kernel-janitors@vger.kernel.org
Subject: [PATCH] thermal: int340x: delete bogus length check
Date: Thu, 30 Sep 2021 15:28:03 +0300 [thread overview]
Message-ID: <20210930122803.GC10068@kili> (raw)
This check has a signedness bug and does not work. If "length" is
larger than "PAGE_SIZE" then "PAGE_SIZE - length" is not negative
but instead it is a large unsigned value. Fortunately, Takashi Iwai
changed this code to use scnprint() instead of snprintf() so now
"length" is never larger than "PAGE_SIZE - 1" and the check can be
removed.
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
---
drivers/thermal/intel/int340x_thermal/int3400_thermal.c | 9 ++++-----
1 file changed, 4 insertions(+), 5 deletions(-)
diff --git a/drivers/thermal/intel/int340x_thermal/int3400_thermal.c b/drivers/thermal/intel/int340x_thermal/int3400_thermal.c
index 19926beeb3b7..8502b7d8df89 100644
--- a/drivers/thermal/intel/int340x_thermal/int3400_thermal.c
+++ b/drivers/thermal/intel/int340x_thermal/int3400_thermal.c
@@ -129,11 +129,10 @@ static ssize_t available_uuids_show(struct device *dev,
for (i = 0; i < INT3400_THERMAL_MAXIMUM_UUID; i++) {
if (priv->uuid_bitmap & (1 << i))
- if (PAGE_SIZE - length > 0)
- length += scnprintf(&buf[length],
- PAGE_SIZE - length,
- "%s\n",
- int3400_thermal_uuids[i]);
+ length += scnprintf(&buf[length],
+ PAGE_SIZE - length,
+ "%s\n",
+ int3400_thermal_uuids[i]);
}
return length;
--
2.20.1
next reply other threads:[~2021-09-30 12:28 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-09-30 12:28 Dan Carpenter [this message]
2021-10-05 14:47 ` [PATCH] thermal: int340x: delete bogus length check Rafael J. Wysocki
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20210930122803.GC10068@kili \
--to=dan.carpenter@oracle.com \
--cc=amitk@kernel.org \
--cc=daniel.lezcano@linaro.org \
--cc=kernel-janitors@vger.kernel.org \
--cc=linux-pm@vger.kernel.org \
--cc=rui.zhang@intel.com \
--cc=srinivas.pandruvada@linux.intel.com \
--cc=sumeet.r.pawnikar@intel.com \
--cc=tiwai@suse.de \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox