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 270C93F6605; Tue, 17 Mar 2026 17:09:44 +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=1773767385; cv=none; b=EDboKH16LeXNeYZDoUxw3d7ZNuSqS9VvjJ8dEAfb7WKTMK6AYUfro2OB8sxndeKFEiSlHBgB4b6TthDWnV9f3nPUD1glWx9U8mSiaG+Q34QWPRl5fBmwGz6jxEy/rmHFcCevQ9aNVpP2YWIh3dpadtbiPgPHeqVri9lxT5TQ0uY= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1773767385; c=relaxed/simple; bh=SHocelXTFFsDk3SgcaPfYIEvwATlhqhWrRFM0DAof48=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=iBcGk1mCEPh0+6e+j2AZEd/EftjSlxVp9Z8hRSVmh27h8yU+XzdZjuIsbWPH00N7VKv9Q3ZfJ6r7HZ4SqTEvwwChMZNvCn/SSwSWG0Tk5VPjafZKLBIsEjRDSHOHjaMM3X6/kgQImN6Ctd0MRdvHKQBWTe2K4hpjc5Yuq1GIhJk= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=PghUPrnD; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="PghUPrnD" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 3AE9CC19424; Tue, 17 Mar 2026 17:09:43 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1773767384; bh=SHocelXTFFsDk3SgcaPfYIEvwATlhqhWrRFM0DAof48=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=PghUPrnDF9jRvB4Z27ub50nyYKSzAsMyXHmJrIfG/Rf26VZownB6GxQIoiIK3Ksck 2B5oYnjtxGIYBJToANvIEUc9URfWwLuUCcX8U+WMgUbo0ERk2qC0m8Z1l3B4zPv0BE mHyGnwzZ0cSxxh3fDLOYNA+jVxLpQ2VPUqah7QMA= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Jenny Guanni Qu , Florian Westphal , Sasha Levin Subject: [PATCH 6.18 068/333] netfilter: nft_set_pipapo: fix stack out-of-bounds read in pipapo_drop() Date: Tue, 17 Mar 2026 17:31:37 +0100 Message-ID: <20260317163001.899058237@linuxfoundation.org> X-Mailer: git-send-email 2.53.0 In-Reply-To: <20260317162959.345812316@linuxfoundation.org> References: <20260317162959.345812316@linuxfoundation.org> User-Agent: quilt/0.69 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: stable@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 6.18-stable review patch. If anyone has any objections, please let me know. ------------------ From: Jenny Guanni Qu [ Upstream commit d6d8cd2db236a9dd13dbc2d05843b3445cc964b5 ] pipapo_drop() passes rulemap[i + 1].n to pipapo_unmap() as the to_offset argument on every iteration, including the last one where i == m->field_count - 1. This reads one element past the end of the stack-allocated rulemap array (declared as rulemap[NFT_PIPAPO_MAX_FIELDS] with NFT_PIPAPO_MAX_FIELDS == 16). Although pipapo_unmap() returns early when is_last is true without using the to_offset value, the argument is evaluated at the call site before the function body executes, making this a genuine out-of-bounds stack read confirmed by KASAN: BUG: KASAN: stack-out-of-bounds in pipapo_drop+0x50c/0x57c [nf_tables] Read of size 4 at addr ffff8000810e71a4 This frame has 1 object: [32, 160) 'rulemap' The buggy address is at offset 164 -- exactly 4 bytes past the end of the rulemap array. Pass 0 instead of rulemap[i + 1].n on the last iteration to avoid the out-of-bounds read. Fixes: 3c4287f62044 ("nf_tables: Add set type for arbitrary concatenation of ranges") Signed-off-by: Jenny Guanni Qu Signed-off-by: Florian Westphal Signed-off-by: Sasha Levin --- net/netfilter/nft_set_pipapo.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/net/netfilter/nft_set_pipapo.c b/net/netfilter/nft_set_pipapo.c index d9b74d588c768..394b78a00a6a5 100644 --- a/net/netfilter/nft_set_pipapo.c +++ b/net/netfilter/nft_set_pipapo.c @@ -1641,6 +1641,7 @@ static void pipapo_drop(struct nft_pipapo_match *m, int i; nft_pipapo_for_each_field(f, i, m) { + bool last = i == m->field_count - 1; int g; for (g = 0; g < f->groups; g++) { @@ -1660,7 +1661,7 @@ static void pipapo_drop(struct nft_pipapo_match *m, } pipapo_unmap(f->mt, f->rules, rulemap[i].to, rulemap[i].n, - rulemap[i + 1].n, i == m->field_count - 1); + last ? 0 : rulemap[i + 1].n, last); if (pipapo_resize(f, f->rules, f->rules - rulemap[i].n)) { /* We can ignore this, a failure to shrink tables down * doesn't make tables invalid. -- 2.51.0