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authorArnaldo Carvalho de Melo <acme@redhat.com>2022-02-16 22:01:00 +0300
committerArnaldo Carvalho de Melo <acme@redhat.com>2022-02-17 13:15:09 +0300
commit31ded1535e3182778a1d0e5c32711f55da3bc512 (patch)
tree034b258a1ea0713f1a173fb8310c86f10af14648 /tools
parent047e6032c4f054372311eb20c759cfe0b3ca7ffe (diff)
downloadlinux-31ded1535e3182778a1d0e5c32711f55da3bc512.tar.xz
perf bpf: Defer freeing string after possible strlen() on it
This was detected by the gcc in Fedora Rawhide's gcc: 50 11.01 fedora:rawhide : FAIL gcc version 12.0.1 20220205 (Red Hat 12.0.1-0) (GCC) inlined from 'bpf__config_obj' at util/bpf-loader.c:1242:9: util/bpf-loader.c:1225:34: error: pointer 'map_opt' may be used after 'free' [-Werror=use-after-free] 1225 | *key_scan_pos += strlen(map_opt); | ^~~~~~~~~~~~~~~ util/bpf-loader.c:1223:9: note: call to 'free' here 1223 | free(map_name); | ^~~~~~~~~~~~~~ cc1: all warnings being treated as errors So do the calculations on the pointer before freeing it. Fixes: 04f9bf2bac72480c ("perf bpf-loader: Add missing '*' for key_scan_pos") Cc: Adrian Hunter <adrian.hunter@intel.com> Cc: Ian Rogers <irogers@google.com> Cc: Jiri Olsa <jolsa@kernel.org> Cc: Namhyung Kim <namhyung@kernel.org> Cc: Wang ShaoBo <bobo.shaobowang@huawei.com> Link: https://lore.kernel.org/lkml/Yg1VtQxKrPpS3uNA@kernel.org Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Diffstat (limited to 'tools')
-rw-r--r--tools/perf/util/bpf-loader.c3
1 files changed, 2 insertions, 1 deletions
diff --git a/tools/perf/util/bpf-loader.c b/tools/perf/util/bpf-loader.c
index 7ecfaac7536a..16ec605a9fe4 100644
--- a/tools/perf/util/bpf-loader.c
+++ b/tools/perf/util/bpf-loader.c
@@ -1220,9 +1220,10 @@ bpf__obj_config_map(struct bpf_object *obj,
pr_debug("ERROR: Invalid map config option '%s'\n", map_opt);
err = -BPF_LOADER_ERRNO__OBJCONF_MAP_OPT;
out:
- free(map_name);
if (!err)
*key_scan_pos += strlen(map_opt);
+
+ free(map_name);
return err;
}