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[85.114.29.218]) by smtp.gmail.com with ESMTPSA id v20-20020ac25934000000b005115eec02d0sm234324lfi.234.2024.02.06.11.42.25 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 06 Feb 2024 11:42:25 -0800 (PST) From: Rand Deeb To: Avi Fishman , Tomer Maimon , Tali Perry , Patrick Venture , Nancy Yuen , Benjamin Fair , openbmc@lists.ozlabs.org, linux-i2c@vger.kernel.org, linux-kernel@vger.kernel.org Cc: deeb.rand@confident.ru, lvc-project@linuxtesting.org, voskresenski.stanislav@confident.ru, Rand Deeb Subject: [PATCH] i2c: Remove redundant comparison in npcm_i2c_reg_slave Date: Tue, 6 Feb 2024 22:42:01 +0300 Message-Id: <20240206194201.10054-1-rand.sec96@gmail.com> X-Mailer: git-send-email 2.34.1 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-getmail-retrieved-from-mailbox: INBOX X-GMAIL-THRID: 1790179871099616165 X-GMAIL-MSGID: 1790179871099616165 In the npcm_i2c_reg_slave() function, there was a redundant comparison that checked if 'bus->slave' was null immediately after assigning it the 'client' value. There were concerns about a potential null dereference because of `client->adapter`, but according to Wolfram Sang, "we trusted ourselves here" Therefore, this comparison is unnecessary. Found by Linux Verification Center (linuxtesting.org) with SVACE. Signed-off-by: Rand Deeb Reviewed-by: Wolfram Sang --- drivers/i2c/busses/i2c-npcm7xx.c | 3 --- 1 file changed, 3 deletions(-) diff --git a/drivers/i2c/busses/i2c-npcm7xx.c b/drivers/i2c/busses/i2c-npcm7xx.c index c1b679737240..bdf35b86e559 100644 --- a/drivers/i2c/busses/i2c-npcm7xx.c +++ b/drivers/i2c/busses/i2c-npcm7xx.c @@ -1247,9 +1247,6 @@ static int npcm_i2c_reg_slave(struct i2c_client *client) bus->slave = client; - if (!bus->slave) - return -EINVAL; - if (client->flags & I2C_CLIENT_TEN) return -EAFNOSUPPORT;