From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id B0262253805; Tue, 11 Feb 2025 01:32:36 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1739237556; cv=none; b=cjmCNKG6HGdEN8mSIqIPdTnr0cxcODwZbEzgP9q/O9uvFAhY0FB+nA/qxWry6YBQONh1fanbDDAR5E91J9hID5Q9D6rDDLecWVareNoG3K3dAKRktw2YzTq4fbwzAUX54q5zIbIVKaiviiy6hrdPK8LXLSYPa97l8/K0BQ3zasg= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1739237556; c=relaxed/simple; bh=iiOkryXmhkldJUUdUWPMeYG3VZWIaMZDxkZthCW/oSQ=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=Jg6hI3CVfRAVXeFCCdQ/23TBpiVsgdEG/tbe14q2KkR0+GxcC9CGb9i2WvM6JbqB5nkbon6U9MOHqWZdeQnYewNHqhr60tr65mt5s6yxgoQS6Dj2vvirv3yh8WoZ5hQAkS1EVjHCAnwrB34Qjz4GCYJH3ZhymUUJVtYIc1sFKYo= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=jOg/ZPR0; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="jOg/ZPR0" Received: by smtp.kernel.org (Postfix) with ESMTPSA id C38EFC4CED1; Tue, 11 Feb 2025 01:32:35 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1739237556; bh=iiOkryXmhkldJUUdUWPMeYG3VZWIaMZDxkZthCW/oSQ=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=jOg/ZPR0GcaFm6+UZ4mPzc/NT7yyGG1HtoVyY9DbkOrO6QF7KjdTgJffbj3/fdCX9 f6eByJPpFe+lXG+feTpb0KlQt06embhpfO/NlgCzc2SpgI1OVYiKbZDRcrxvVSDjC1 OrakVYJgFm1hNQXQClijJly3UuL1fQNVpo7/Bgm1+9XYCDWvVf2C3sLWYA3k7AyxeJ kYb6OghskTftPdGGdZaAS0Ny4WC1G5gSHyx1MnQaYsOINUIS4ErcQHRkiWfZmxPaIX Y1Z1jrotQVcYX+DCmXvyEwmmuWv8x9GCL4JRs+77d6aefqe0YyonW6cfzq31xD2Daq emb77Y9DMoHvg== From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Chengen Du , Konrad Rzeszutek Wilk , Sasha Levin , pjones@redhat.com, konrad@kernel.org Subject: [PATCH AUTOSEL 5.15 4/9] iscsi_ibft: Fix UBSAN shift-out-of-bounds warning in ibft_attr_show_nic() Date: Mon, 10 Feb 2025 20:32:25 -0500 Message-Id: <20250211013230.4098681-4-sashal@kernel.org> X-Mailer: git-send-email 2.39.5 In-Reply-To: <20250211013230.4098681-1-sashal@kernel.org> References: <20250211013230.4098681-1-sashal@kernel.org> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore X-stable-base: Linux 5.15.178 Content-Transfer-Encoding: 8bit From: Chengen Du [ Upstream commit 07e0d99a2f701123ad3104c0f1a1e66bce74d6e5 ] When performing an iSCSI boot using IPv6, iscsistart still reads the /sys/firmware/ibft/ethernetX/subnet-mask entry. Since the IPv6 prefix length is 64, this causes the shift exponent to become negative, triggering a UBSAN warning. As the concept of a subnet mask does not apply to IPv6, the value is set to ~0 to suppress the warning message. Signed-off-by: Chengen Du Signed-off-by: Konrad Rzeszutek Wilk Signed-off-by: Sasha Levin --- drivers/firmware/iscsi_ibft.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) diff --git a/drivers/firmware/iscsi_ibft.c b/drivers/firmware/iscsi_ibft.c index 6e9788324fea5..371f24569b3b2 100644 --- a/drivers/firmware/iscsi_ibft.c +++ b/drivers/firmware/iscsi_ibft.c @@ -310,7 +310,10 @@ static ssize_t ibft_attr_show_nic(void *data, int type, char *buf) str += sprintf_ipaddr(str, nic->ip_addr); break; case ISCSI_BOOT_ETH_SUBNET_MASK: - val = cpu_to_be32(~((1 << (32-nic->subnet_mask_prefix))-1)); + if (nic->subnet_mask_prefix > 32) + val = cpu_to_be32(~0); + else + val = cpu_to_be32(~((1 << (32-nic->subnet_mask_prefix))-1)); str += sprintf(str, "%pI4", &val); break; case ISCSI_BOOT_ETH_PREFIX_LEN: -- 2.39.5