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Fri, 02 May 2025 01:40:19 -0700 (PDT) Received: from localhost ([196.207.164.177]) by smtp.gmail.com with UTF8SMTPSA id ffacd0b85a97d-3a099b0f118sm1482225f8f.78.2025.05.02.01.40.18 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 02 May 2025 01:40:18 -0700 (PDT) Date: Fri, 2 May 2025 11:40:15 +0300 From: Dan Carpenter To: Antheas Kapenekakis Cc: Derek John Clark , =?iso-8859-1?Q?Joaqu=EDn_Ignacio_Aramend=EDa?= , Hans de Goede , Ilpo =?iso-8859-1?Q?J=E4rvinen?= , Thomas =?iso-8859-1?Q?Wei=DFschuh?= , platform-driver-x86@vger.kernel.org, linux-kernel@vger.kernel.org, kernel-janitors@vger.kernel.org Subject: [PATCH next] platform/x86: oxpec: Add a lower bounds check in oxp_psy_ext_set_prop() Message-ID: Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Disposition: inline X-Mailer: git-send-email haha only kidding Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" The "val->intval" variable is an integer which comes from the user. This code has an upper bounds check but the lower bounds check was accidentally omitted. The write_to_ec() take a u8 value as a parameter so negative values would be truncated to positive values in the 0-255 range. Return -EINVAL if the user passes a negative value. Fixes: 202593d1e86b ("platform/x86: oxpec: Add charge threshold and behavio= ur to OneXPlayer") Signed-off-by: Dan Carpenter --- drivers/platform/x86/oxpec.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/platform/x86/oxpec.c b/drivers/platform/x86/oxpec.c index 4b48f4571b09..de70ca7e8493 100644 --- a/drivers/platform/x86/oxpec.c +++ b/drivers/platform/x86/oxpec.c @@ -582,7 +582,7 @@ static int oxp_psy_ext_set_prop(struct power_supply *ps= y, =20 switch (psp) { case POWER_SUPPLY_PROP_CHARGE_CONTROL_END_THRESHOLD: - if (val->intval > 100) + if (val->intval < 0 || val->intval > 100) return -EINVAL; return write_to_ec(OXP_X1_CHARGE_LIMIT_REG, val->intval); case POWER_SUPPLY_PROP_CHARGE_BEHAVIOUR: --=20 2.47.2