perf llvm: Return -ENOMEM when asprintf() fails

BugLink: https://bugs.launchpad.net/bugs/1938340
[ 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@huawei.com>
Reported-by: Zhihao Cheng <chengzhihao1@huawei.com>
Cc: Alexei Starovoitov <ast@kernel.org>
Cc: Andrii Nakryiko <andrii@kernel.org>
Cc: Daniel Borkmann <daniel@iogearbox.net>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Nathan Chancellor <nathan@kernel.org>
Cc: Nick Desaulniers <ndesaulniers@google.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Yu Kuai <yukuai3@huawei.com>
Cc: clang-built-linux@googlegroups.com
Link: http://lore.kernel.org/lkml/20210609115945.2193194-1-chengzhihao1@huawei.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Signed-off-by: Kamal Mostafa <kamal@canonical.com>
Signed-off-by: Stefan Bader <stefan.bader@canonical.com>

diff --git a/tools/perf/util/llvm-utils.c b/tools/perf/util/llvm-utils.c
index dbdffb6673feb63b63fc6b7aa0ec0ed167032881..0bf6b4d4c90a73860571fb89a48c581f0d29495f 100644 (file)
--- a/tools/perf/util/llvm-utils.c
+++ b/tools/perf/util/llvm-utils.c
@@ -504,6 +504,7 @@ int llvm__compile_bpf(const char *path, void **p_obj_buf,
                        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");
@@ -524,6 +525,7 @@ int llvm__compile_bpf(const char *path, void **p_obj_buf,
 
        pr_debug("llvm compiling command template: %s\n", template);
 
+       err = -ENOMEM;
        if (asprintf(&command_echo, "echo -n \"%s\"", template) < 0)
                goto errout;