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 BB1CBA94F for ; Mon, 17 Jul 2023 15:23:31 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 08EF8C433C7; Mon, 17 Jul 2023 15:23:29 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1689607411; bh=cvdO36sarOiv5ZpCKU2EQAmrbByydT2MCd5DqCQtaFA=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=CiXJ4YoiIgypHxscNLzvVUm/eIK/XxIR43zivwBPTByv4h1w2LYd6zyEgyEiBIBrS UPpJHHiZe+fNd/ZojAuxR4+P5/pPkM9yBbGjByYAoLLiWrZKWf/BHq78hdMY4XJBz2 tgDychYcg15CMuYi3XkTGuGtcnQTIlc3fyLdrXli3bbCl84QOJWRyM74DcLoldDoRn +9nWFfvceH7Ssv+9kw3oj7pABfrbMb4xnYq4MprQx80XHQ32WW8fMLG6JLf6Ne8Ldi CS7YfmLgmDcUeOjnvHW9FuZRgAXPkoWZvbzHEw0H0eoYYkyfesnanBBH6+YJ19s+Kp 6CcB0qvYJ8kBg== From: "Masami Hiramatsu (Google)" To: linux-trace-kernel@vger.kernel.org Cc: linux-kernel@vger.kernel.org, Steven Rostedt , mhiramat@kernel.org, Martin KaFai Lau , bpf@vger.kernel.org, Sven Schnelle , Alexei Starovoitov Subject: [PATCH v2 1/9] tracing/probes: Fix to add NULL check for BTF APIs Date: Tue, 18 Jul 2023 00:23:27 +0900 Message-Id: <168960740754.34107.12202350138610653557.stgit@devnote2> X-Mailer: git-send-email 2.25.1 In-Reply-To: <168960739768.34107.15145201749042174448.stgit@devnote2> References: <168960739768.34107.15145201749042174448.stgit@devnote2> User-Agent: StGit/0.19 Precedence: bulk X-Mailing-List: bpf@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 8bit From: Masami Hiramatsu (Google) Since find_btf_func_param() abd btf_type_by_id() can return NULL, the caller must check the return value correctly. Fixes: b576e09701c7 ("tracing/probes: Support function parameters if BTF is available") Signed-off-by: Masami Hiramatsu (Google) --- kernel/trace/trace_probe.c | 8 ++++---- 1 file changed, 4 insertions(+), 4 deletions(-) diff --git a/kernel/trace/trace_probe.c b/kernel/trace/trace_probe.c index b2b726bea1f9..c68a72707852 100644 --- a/kernel/trace/trace_probe.c +++ b/kernel/trace/trace_probe.c @@ -386,12 +386,12 @@ static const struct btf_type *find_btf_func_proto(const char *funcname) /* Get BTF_KIND_FUNC type */ t = btf_type_by_id(btf, id); - if (!btf_type_is_func(t)) + if (!t || !btf_type_is_func(t)) return ERR_PTR(-ENOENT); /* The type of BTF_KIND_FUNC is BTF_KIND_FUNC_PROTO */ t = btf_type_by_id(btf, t->type); - if (!btf_type_is_func_proto(t)) + if (!t || !btf_type_is_func_proto(t)) return ERR_PTR(-ENOENT); return t; @@ -443,7 +443,7 @@ static int parse_btf_arg(const char *varname, struct fetch_insn *code, if (!ctx->params) { params = find_btf_func_param(ctx->funcname, &ctx->nr_params, ctx->flags & TPARG_FL_TPOINT); - if (IS_ERR(params)) { + if (IS_ERR_OR_NULL(params)) { trace_probe_log_err(ctx->offset, NO_BTF_ENTRY); return PTR_ERR(params); } @@ -1273,7 +1273,7 @@ const char **traceprobe_expand_meta_args(int argc, const char *argv[], params = find_btf_func_param(ctx->funcname, &nr_params, ctx->flags & TPARG_FL_TPOINT); - if (IS_ERR(params)) { + if (IS_ERR_OR_NULL(params)) { if (args_idx != -1) { /* $arg* requires BTF info */ trace_probe_log_err(0, NOSUP_BTFARG);