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 11BB81C7D68; Wed, 5 Jun 2024 12:04:29 +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=1717589069; cv=none; b=XU1iCseXY+Jd6U4lVQD4/Lexdah+rySqpkXscCapNOjoDOdA2uH6HsR/Zi1sGKJJ1kppI8FpJI2n4Za59gR7rRdKjopmneyx8EN8h+QhbUmP3h6ufYkaksHPm101Hko5xVIrbvI24vQ4nSpJUGgI01eaXolDKELGXtI1hwNWcrw= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1717589069; c=relaxed/simple; bh=m3CfvU2t8e740CAdb6g+m9jKiMWSdqG1ZUq+ET575AA=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=YqAPjq6eY9ZrEWegZ6FkQQFMMWuL6t4zuDsAnAYodB4tNCIq7DKR12R7uajF0F2TIv9Xi44U+qvbhx+MxF9K4pCrOgNAXwXI6cOTdY7V3cmQ75b03+cg/+xayFXNo+36xlyGROJ24kV/8uj1J3+03GOAkXob4YGosesZSCLRV98= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=A9DY2sg2; 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="A9DY2sg2" Received: by smtp.kernel.org (Postfix) with ESMTPSA id E1CC4C32781; Wed, 5 Jun 2024 12:04:27 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1717589068; bh=m3CfvU2t8e740CAdb6g+m9jKiMWSdqG1ZUq+ET575AA=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=A9DY2sg2juvtB3XTrr5kBw7zs9+KibBI/GN+dDZwAyEUT4x7QhdE25ZV2RPm64j4t KIUT/molg5LAu7/SUk9EHxxos8vvdg2n71/+l68fyH9eS36150ETXusZfOyIabI0F8 1Ot7Gzh4UqXqpc4fRhnsWlD8B3rKbS0Br1DXNSMfnWwtVqcz9uF40IeEetAFRnW5Vr GnpzA7nyyRNPnpVfSF2sbXTq3f1ORHYoNcmfDoExmVH9bS5Tqkm5KCZwulm2VEKJCv 8qRO0/vfqmj9ND6297u9N/7XUqywPwqhgOHxAC7BTLduscBC9QW1yoJ8bBhdkSwZmf ED91tp9r2u6pw== From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Edward Adam Davis , syzbot+71bfed2b2bcea46c98f2@syzkaller.appspotmail.com, "David S . Miller" , Sasha Levin , bongsu.jeon@samsung.com, krzk@kernel.org, netdev@vger.kernel.org Subject: [PATCH AUTOSEL 6.6 12/18] nfc/nci: Add the inconsistency check between the input data length and count Date: Wed, 5 Jun 2024 08:03:51 -0400 Message-ID: <20240605120409.2967044-12-sashal@kernel.org> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20240605120409.2967044-1-sashal@kernel.org> References: <20240605120409.2967044-1-sashal@kernel.org> Precedence: bulk X-Mailing-List: stable@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore X-stable-base: Linux 6.6.32 Content-Transfer-Encoding: 8bit From: Edward Adam Davis [ Upstream commit 068648aab72c9ba7b0597354ef4d81ffaac7b979 ] write$nci(r0, &(0x7f0000000740)=ANY=[@ANYBLOB="610501"], 0xf) Syzbot constructed a write() call with a data length of 3 bytes but a count value of 15, which passed too little data to meet the basic requirements of the function nci_rf_intf_activated_ntf_packet(). Therefore, increasing the comparison between data length and count value to avoid problems caused by inconsistent data length and count. Reported-and-tested-by: syzbot+71bfed2b2bcea46c98f2@syzkaller.appspotmail.com Signed-off-by: Edward Adam Davis Signed-off-by: David S. Miller Signed-off-by: Sasha Levin --- drivers/nfc/virtual_ncidev.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/drivers/nfc/virtual_ncidev.c b/drivers/nfc/virtual_ncidev.c index 590b038e449e5..6b89d596ba9af 100644 --- a/drivers/nfc/virtual_ncidev.c +++ b/drivers/nfc/virtual_ncidev.c @@ -125,6 +125,10 @@ static ssize_t virtual_ncidev_write(struct file *file, kfree_skb(skb); return -EFAULT; } + if (strnlen(skb->data, count) != count) { + kfree_skb(skb); + return -EINVAL; + } nci_recv_frame(vdev->ndev, skb); return count; -- 2.43.0