linux-kernel - [PATCH 4.19 224/421] perf llvm: Return -ENOMEM when asprintf() fails

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Message-Id: <20210719144954.099761899@linuxfoundation.org>
Date:   Mon, 19 Jul 2021 16:50:35 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Hulk Robot <hulkci@...wei.com>,
        Zhihao Cheng <chengzhihao1@...wei.com>,
        Alexei Starovoitov <ast@...nel.org>,
        Andrii Nakryiko <andrii@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Ingo Molnar <mingo@...hat.com>, Jiri Olsa <jolsa@...hat.com>,
        Nathan Chancellor <nathan@...nel.org>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Yu Kuai <yukuai3@...wei.com>,
        clang-built-linux@...glegroups.com,
        Arnaldo Carvalho de Melo <acme@...hat.com>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 4.19 224/421] perf llvm: Return -ENOMEM when asprintf() fails

From: Arnaldo Carvalho de Melo <acme@...hat.com>

[ Upstream commit c435c166dcf526ac827bc964d82cc0d5e7a1fd0b ]

Zhihao sent a patch but it made llvm__compile_bpf() return what
asprintf() returns on error, which is just -1, but since this function
returns -errno, fix it by returning -ENOMEM for this case instead.

Fixes: cb76371441d098 ("perf llvm: Allow passing options to llc ...")
Fixes: 5eab5a7ee032ac ("perf llvm: Display eBPF compiling command ...")
Reported-by: Hulk Robot <hulkci@...wei.com>
Reported-by: Zhihao Cheng <chengzhihao1@...wei.com>
Cc: Alexei Starovoitov <ast@...nel.org>
Cc: Andrii Nakryiko <andrii@...nel.org>
Cc: Daniel Borkmann <daniel@...earbox.net>
Cc: Ingo Molnar <mingo@...hat.com>
Cc: Jiri Olsa <jolsa@...hat.com>
Cc: Nathan Chancellor <nathan@...nel.org>
Cc: Nick Desaulniers <ndesaulniers@...gle.com>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Yu Kuai <yukuai3@...wei.com>
Cc: clang-built-linux@...glegroups.com
Link: http://lore.kernel.org/lkml/20210609115945.2193194-1-chengzhihao1@huawei.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@...hat.com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 tools/perf/util/llvm-utils.c |    2 ++
 1 file changed, 2 insertions(+)

--- a/tools/perf/util/llvm-utils.c
+++ b/tools/perf/util/llvm-utils.c
@@ -500,6 +500,7 @@ int llvm__compile_bpf(const char *path,
 			goto errout;
 		}
 
+		err = -ENOMEM;
 		if (asprintf(&pipe_template, "%s -emit-llvm | %s -march=bpf %s -filetype=obj -o -",
 			      template, llc_path, opts) < 0) {
 			pr_err("ERROR:\tnot enough memory to setup command line\n");
@@ -520,6 +521,7 @@ int llvm__compile_bpf(const char *path,
 
 	pr_debug("llvm compiling command template: %s\n", template);
 
+	err = -ENOMEM;
 	if (asprintf(&command_echo, "echo -n \"%s\"", template) < 0)
 		goto errout;