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perf dlfilter: Be defensive against potential NULL dereference

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In the unlikely case of having a symbol without a mapping, avoid a
NULL dereference that clang-tidy warns about.

Signed-off-by: Ian Rogers <irogers@google.com>
Acked-by: Namhyung Kim <namhyung@kernel.org>
Cc: Ravi Bangoria <ravi.bangoria@amd.com>
Cc: Nick Desaulniers <ndesaulniers@google.com>
Cc: Yang Jihong <yangjihong1@huawei.com>
Cc: Huacai Chen <chenhuacai@kernel.org>
Cc: Nathan Chancellor <nathan@kernel.org>
Cc: Kan Liang <kan.liang@linux.intel.com>
Cc: llvm@lists.linux.dev
Cc: Ming Wang <wangming01@loongson.cn>
Cc: Tom Rix <trix@redhat.com>
Cc: bpf@vger.kernel.org
Link: https://lore.kernel.org/r/20231009183920.200859-11-irogers@google.com
Signed-off-by: Namhyung Kim <namhyung@kernel.org>
This commit is contained in:
Ian Rogers
2023-10-09 11:39:11 -07:00
committed by Namhyung Kim
parent 85f73c377b
commit 52a5ad12f2
1 changed files with 3 additions and 1 deletions
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4
tools/perf/util/dlfilter.c
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@@ -52,8 +52,10 @@ static void al_to_d_al(struct addr_location *al, struct perf_dlfilter_al *d_al)
d_al->sym_end = sym->end;
if (al->addr < sym->end)
d_al->symoff = al->addr - sym->start;
else
else if (al->map)
d_al->symoff = al->addr - map__start(al->map) - sym->start;
else
d_al->symoff = 0;
d_al->sym_binding = sym->binding;
} else {
d_al->sym = NULL;