From nobody Fri Apr 3 20:53:34 2026 Received: from akranes.kaiser.cx (akranes.kaiser.cx [152.53.16.207]) (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 097EA38C42B; Mon, 23 Mar 2026 10:40:21 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=152.53.16.207 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1774262424; cv=none; b=Z64fkQWAfbsXt83lcXv7dRDcVar3uOwEqN2p5Q2QKDeaAyqgcs5G+ksqrva3z0rqfb7sEHBEoyxHa6+PE9S0xDADOc/uYhQFjBi8VmVzR35UXs5TYsUA5UYdgV4cLDflZKKDHbCdDDcUjt28Gcp8AEeWg6IS4geQTwTm02qzLNY= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1774262424; c=relaxed/simple; bh=1hCCkmQUs0bLrA/OH4MBJ4sc2NkuG0D52C4RqPnGYSI=; h=From:To:Cc:Subject:Date:Message-ID:MIME-Version; b=W+gZTXtOFPNVobH5G9iULe/0ejxJ+rYQyIAI8R/VzFQcxXXsDja6CjwYYTEE1Ls/a0ZbutUtDHhoIUFzhFn92+Vn+Hz43FzY2JlX5Fwy6U950jb5IqTMITBTXKq54hoBgjkplrbIpWFyeLaF8VIcFiQ/AdJAYBU7TiyytBFn8f8= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=kaiser.cx; spf=pass smtp.mailfrom=kaiser.cx; arc=none smtp.client-ip=152.53.16.207 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=kaiser.cx Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=kaiser.cx Received: from ipservice-092-208-105-007.092.208.pools.vodafone-ip.de ([92.208.105.7] helo=nb282.user.codasip.com) by akranes.kaiser.cx with esmtpsa (TLS1.3) tls TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 (Exim 4.98.2) (envelope-from ) id 1w4cOk-00000001Wr7-16Ro; Mon, 23 Mar 2026 11:20:38 +0100 From: Martin Kaiser To: Steven Rostedt , Masami Hiramatsu Cc: Mathieu Desnoyers , linux-trace-kernel@vger.kernel.org, linux-kernel@vger.kernel.org, Martin Kaiser , stable@vger.kernel.org Subject: [PATCH] tracing: fprobe: fix the length of unused fgraph_data Date: Mon, 23 Mar 2026 11:19:36 +0100 Message-ID: <20260323102020.239567-1-martin@kaiser.cx> X-Mailer: git-send-email 2.43.7 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" If fprobe_entry does not fill the allocated fgraph_data completely, the unused part is zeroed with memset. Fix the length for this memset call. Both reserved_words and used are in units of return stack words, but memset needs the number of bytes. Cc: stable@vger.kernel.org Fixes: 4346ba160409 ("fprobe: Rewrite fprobe on function-graph tracer") Signed-off-by: Martin Kaiser --- kernel/trace/fprobe.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/kernel/trace/fprobe.c b/kernel/trace/fprobe.c index dcadf1d23b8a..6a1192515afd 100644 --- a/kernel/trace/fprobe.c +++ b/kernel/trace/fprobe.c @@ -451,7 +451,7 @@ static int fprobe_fgraph_entry(struct ftrace_graph_ent = *trace, struct fgraph_ops } } if (used < reserved_words) - memset(fgraph_data + used, 0, reserved_words - used); + memset(fgraph_data + used, 0, (reserved_words - used) * sizeof(long)); =20 /* If any exit_handler is set, data must be used. */ return used !=3D 0; --=20 2.43.7