From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-alma10-1.taild15c8.ts.net [100.103.45.18]) (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 6F53046AF3C; Tue, 16 Jun 2026 16:33:56 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=100.103.45.18 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1781627637; cv=none; b=TPj3F1lT0KtnDjMcJna26Zv4HGN3egsNruT57Uc3CZzk3fQkHfh5uVlFeJy97e/QHj06jowyhh1pjZJTojnqcrE7CrxvlmD9jHOx0fWXRGUjJ3wsMUyv3kVgqQOXt3kef5pT2T/P8EwPKi1MeqcDyqu8PkPRPK2xXhK8rrw/5XU= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1781627637; c=relaxed/simple; bh=cPHEhziBTErVOfFPLu+08+1KGq9HLu86gn3Qopj3smo=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=PxmYZWGIquVFGm/JmHkKehQqem6W3+ILM3aOduLMhen8Ps7dexnCmHgDin6f6eUPETeG9LB898QpdPUK8GclIVYUAMc83F/yt/SVyn3iVwApasdviKTQ5+w182pzH+Q97pLAR0ZJCWMUHMhjRsMH7eYdwEk0dWen7mT/BXsRn40= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=MF1KTEGH; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="MF1KTEGH" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 7152B1F000E9; Tue, 16 Jun 2026 16:33:55 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1781627636; bh=aM+SPBPQSVpqYHsyySMRoRYxoXlW1mZdtM36nVyIGsE=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=MF1KTEGHdF128svEy6H1ou2sY3167UWYZYEnrU+h6V8cMOET6Jm7Rs+gkBWjV/EYA uaaFm3RvocqSrjcYJ7FuSabPaaEXArjSPqvR3D5t6sLoEVOSJ5UWF8+qbd03ZGj7bA XRozeXmLTkPsMv19qBL+x0mnr7Y05VPzUXOsFiOc= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Michael Bommarito , Mika Westerberg Subject: [PATCH 6.12 202/261] thunderbolt: Reject zero-length property entries in validator Date: Tue, 16 Jun 2026 20:30:40 +0530 Message-ID: <20260616145054.412825431@linuxfoundation.org> X-Mailer: git-send-email 2.54.0 In-Reply-To: <20260616145044.869532709@linuxfoundation.org> References: <20260616145044.869532709@linuxfoundation.org> User-Agent: quilt/0.69 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: patches@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 6.12-stable review patch. If anyone has any objections, please let me know. ------------------ From: Michael Bommarito commit cff8eb65d1eafe7793e54b4d0cf6bf831644630b upstream. tb_property_entry_valid() accepts entries with length == 0 for DIRECTORY, DATA, and TEXT types. A zero-length TEXT entry passes validation but causes an underflow in the null-termination logic: property->value.text[property->length * 4 - 1] = '\0'; When property->length is 0 this writes to offset -1 relative to the allocation. Reject zero-length entries early in the validator since they have no valid representation in the XDomain property protocol. Fixes: cdae7c07e3e3 ("thunderbolt: Add support for XDomain properties") Cc: stable@vger.kernel.org Assisted-by: Claude:claude-opus-4-7 Signed-off-by: Michael Bommarito Signed-off-by: Mika Westerberg Signed-off-by: Greg Kroah-Hartman --- drivers/thunderbolt/property.c | 2 ++ 1 file changed, 2 insertions(+) --- a/drivers/thunderbolt/property.c +++ b/drivers/thunderbolt/property.c @@ -60,6 +60,8 @@ static bool tb_property_entry_valid(cons case TB_PROPERTY_TYPE_DIRECTORY: case TB_PROPERTY_TYPE_DATA: case TB_PROPERTY_TYPE_TEXT: + if (!entry->length) + return false; if (entry->length > block_len) return false; if (check_add_overflow(entry->value, entry->length, &end) ||