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 8604840B11B; Tue, 21 Jul 2026 15:37:26 +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=1784648247; cv=none; b=S8dT5UQ5ILeIEyPJXHkF+Q8jy4K7VklEwtbJsfKRiGgH7VtZ4x7Ah+ex0y6zGfCWqfnoV+rh3ztwvXZDxZTO3i+fubnmtcdHYR9YKl1fv5T3BWSjNi8TYz+Og5JZ45Jqf0S6rh7fTyczXj9q0vR+aIV0Q0OZryBF7BeU936zEOM= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1784648247; c=relaxed/simple; bh=ElkgWfcRdaQMPM4c6TqmKTzPSxQUfw6mfh7KJAEyvqA=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=fbWiNAuyMVvAkZjW6X+p9V++YPCHsEvUl4i5PIqfbM6tR2zDUJ3Y5SJiKTU6Rfs6NAuTbXBUz6/v3ZKTiqqqUCikgy/jvkEy4JGjMNgt9bhJUHyCHbVON3WVitKYOlnkxHg9CHc5O/wHHYlZ2C1lW1is9GXRxWLBA/5nAE9+rlw= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=aDgzuhSc; 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="aDgzuhSc" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 97A531F000E9; Tue, 21 Jul 2026 15:37:25 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1784648246; bh=I6uTPltVTJgT5mN2AQKAA4Mh2tuTTh3gJwNtrOcpHGk=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=aDgzuhSczz01zyZKTPeYcENBdfa3cjEE2e9lA2VdtMtkxx556m2mJrg3yE6/KOEQL 5S6iJgw6utAExTDUcDjlk17xjvyXFzs46s2mCepkG38gzEh3kaEmFLRZIJWSwQGyjf 4C7LWKfbwIJP8VQXguvRMGCpujqUS+xy3kY5hJ2s= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Song Liu , Miroslav Benes , Josh Poimboeuf , Sasha Levin Subject: [PATCH 7.1 0125/2077] objtool/klp: Fix cloning of zero-length section symbols Date: Tue, 21 Jul 2026 16:56:38 +0200 Message-ID: <20260721152555.645895222@linuxfoundation.org> X-Mailer: git-send-email 2.55.0 In-Reply-To: <20260721152552.646164743@linuxfoundation.org> References: <20260721152552.646164743@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 7.1-stable review patch. If anyone has any objections, please let me know. ------------------ From: Josh Poimboeuf [ Upstream commit 98377f3ba7c02d6eb34e203c9f9823bc62b0d231 ] Fix NULL dereference when cloning a symbol from an empty section. sec->data is only populated for sections with non-zero size. Fixes: dd590d4d57eb ("objtool/klp: Introduce klp diff subcommand for diffing object files") Acked-by: Song Liu Reviewed-by: Miroslav Benes Signed-off-by: Josh Poimboeuf Signed-off-by: Sasha Levin --- tools/objtool/klp-diff.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/tools/objtool/klp-diff.c b/tools/objtool/klp-diff.c index 8aec5f5702c73b..67fdc43a743373 100644 --- a/tools/objtool/klp-diff.c +++ b/tools/objtool/klp-diff.c @@ -669,7 +669,7 @@ static struct symbol *__clone_symbol(struct elf *elf, struct symbol *patched_sym size_t size; /* bss doesn't have data */ - if (patched_sym->sec->data->d_buf) + if (patched_sym->sec->data && patched_sym->sec->data->d_buf) data = patched_sym->sec->data->d_buf + patched_sym->offset; if (is_sec_sym(patched_sym)) -- 2.53.0