From: coverity-bot <keescook@chromium.org>
To: Shayne Chen <shayne.chen@mediatek.com>
Cc: Lorenzo Bianconi <lorenzo@kernel.org>,
linux-wireless@vger.kernel.org, Jakub Kicinski <kuba@kernel.org>,
Kalle Valo <kvalo@kernel.org>,
StanleyYP Wang <StanleyYP.Wang@mediatek.com>,
Matthias Brugger <matthias.bgg@gmail.com>,
Peter Chiu <chui-hao.chiu@mediatek.com>,
Eric Dumazet <edumazet@google.com>,
Money Wang <Money.Wang@mediatek.com>,
linux-arm-kernel@lists.infradead.org, netdev@vger.kernel.org,
Howard Hsu <howard-yh.hsu@mediatek.com>,
linux-mediatek@lists.infradead.org, Felix Fietkau <nbd@nbd.name>,
"David S. Miller" <davem@davemloft.net>,
Evelyn Tsai <evelyn.tsai@mediatek.com>,
linux-kernel@vger.kernel.org,
MeiChia Chiu <meichia.chiu@mediatek.com>,
Paolo Abeni <pabeni@redhat.com>,
Sean Wang <sean.wang@mediatek.com>,
Bo Jiao <Bo.Jiao@mediatek.com>,
Ryder Lee <ryder.lee@mediatek.com>,
Sujuan Chen <sujuan.chen@mediatek.com>,
"Gustavo A. R. Silva" <gustavo@embeddedor.com>,
linux-next@vger.kernel.org, linux-hardening@vger.kernel.org
Subject: Coverity: mt7996_rf_regval_set(): Integer handling issues
Date: Fri, 2 Dec 2022 14:05:43 -0800 [thread overview]
Message-ID: <202212021405.93CF11D2A@keescook> (raw)
Hello!
This is an experimental semi-automated report about issues detected by
Coverity from a scan of next-20221202 as part of the linux-next scan project:
https://scan.coverity.com/projects/linux-next-weekly-scan
You're getting this email because you were associated with the identified
lines of code (noted below) that were touched by commits:
Thu Dec 1 17:29:14 2022 +0100
98686cd21624 ("wifi: mt76: mt7996: add driver for MediaTek Wi-Fi 7 (802.11be) devices")
Coverity reported the following:
*** CID 1527816: Integer handling issues (INCOMPATIBLE_CAST)
drivers/net/wireless/mediatek/mt76/mt7996/debugfs.c:657 in mt7996_rf_regval_set()
651
652 static int
653 mt7996_rf_regval_set(void *data, u64 val)
654 {
655 struct mt7996_dev *dev = data;
656
vvv CID 1527816: Integer handling issues (INCOMPATIBLE_CAST)
vvv Pointer "&val" points to an object whose effective type is "unsigned long long" (64 bits, unsigned) but is dereferenced as a narrower "unsigned int" (32 bits, unsigned). This may lead to unexpected results depending on machine endianness.
657 return mt7996_mcu_rf_regval(dev, dev->mt76.debugfs_reg, (u32 *)&val, true);
658 }
659
660 DEFINE_DEBUGFS_ATTRIBUTE(fops_rf_regval, mt7996_rf_regval_get,
661 mt7996_rf_regval_set, "0x%08llx\n");
662
If this is a false positive, please let us know so we can mark it as
such, or teach the Coverity rules to be smarter. If not, please make
sure fixes get into linux-next. :) For patches fixing this, please
include these lines (but double-check the "Fixes" first):
Reported-by: coverity-bot <keescook+coverity-bot@chromium.org>
Addresses-Coverity-ID: 1527816 ("Integer handling issues")
Fixes: 98686cd21624 ("wifi: mt76: mt7996: add driver for MediaTek Wi-Fi 7 (802.11be) devices")
Thanks for your attention!
--
Coverity-bot
reply other threads:[~2022-12-02 22:05 UTC|newest]
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