From: Adrian Hunter <adrian.hunter@intel.com> stable inclusion from stable-v6.6.33 commit 6bb1efff9b174dbe210c6b82cc7052dc07ff811f category: bugfix bugzilla: https://gitee.com/openeuler/kernel/issues/IAD6H2 Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=... -------------------------------- [ Upstream commit e101a05f79fd4ee3e89d2f3fb716493c33a33708 ] MemorySanitizer discovered instances where the instruction op value was not assigned.: WARNING: MemorySanitizer: use-of-uninitialized-value #0 0x5581c00a76b3 in intel_pt_sample_flags tools/perf/util/intel-pt.c:1527:17 Uninitialized value was stored to memory at #0 0x5581c005ddf8 in intel_pt_walk_insn tools/perf/util/intel-pt-decoder/intel-pt-decoder.c:1256:25 The op value is used to set branch flags for branch instructions encountered when walking the code, so fix by setting op to INTEL_PT_OP_OTHER in other cases. Fixes: 4c761d805bb2d2ea ("perf intel-pt: Fix intel_pt_fup_event() assumptions about setting state type") Reported-by: Ian Rogers <irogers@google.com> Signed-off-by: Adrian Hunter <adrian.hunter@intel.com> Tested-by: Ian Rogers <irogers@google.com> Cc: Jiri Olsa <jolsa@kernel.org> Cc: Namhyung Kim <namhyung@kernel.org> Closes: https://lore.kernel.org/linux-perf-users/20240320162619.1272015-1-irogers@go... Link: https://lore.kernel.org/r/20240326083223.10883-1-adrian.hunter@intel.com Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com> Signed-off-by: Sasha Levin <sashal@kernel.org> Signed-off-by: Wang Hai <wanghai38@huawei.com> --- tools/perf/util/intel-pt-decoder/intel-pt-decoder.c | 2 ++ tools/perf/util/intel-pt.c | 2 ++ 2 files changed, 4 insertions(+) diff --git a/tools/perf/util/intel-pt-decoder/intel-pt-decoder.c b/tools/perf/util/intel-pt-decoder/intel-pt-decoder.c index b450178e3420..e733f6b1f7ac 100644 --- a/tools/perf/util/intel-pt-decoder/intel-pt-decoder.c +++ b/tools/perf/util/intel-pt-decoder/intel-pt-decoder.c @@ -1319,6 +1319,8 @@ static bool intel_pt_fup_event(struct intel_pt_decoder *decoder, bool no_tip) bool ret = false; decoder->state.type &= ~INTEL_PT_BRANCH; + decoder->state.insn_op = INTEL_PT_OP_OTHER; + decoder->state.insn_len = 0; if (decoder->set_fup_cfe_ip || decoder->set_fup_cfe) { bool ip = decoder->set_fup_cfe_ip; diff --git a/tools/perf/util/intel-pt.c b/tools/perf/util/intel-pt.c index f38893e0b036..4db9a098f592 100644 --- a/tools/perf/util/intel-pt.c +++ b/tools/perf/util/intel-pt.c @@ -764,6 +764,7 @@ static int intel_pt_walk_next_insn(struct intel_pt_insn *intel_pt_insn, addr_location__init(&al); intel_pt_insn->length = 0; + intel_pt_insn->op = INTEL_PT_OP_OTHER; if (to_ip && *ip == to_ip) goto out_no_cache; @@ -898,6 +899,7 @@ static int intel_pt_walk_next_insn(struct intel_pt_insn *intel_pt_insn, if (to_ip && *ip == to_ip) { intel_pt_insn->length = 0; + intel_pt_insn->op = INTEL_PT_OP_OTHER; goto out_no_cache; } -- 2.17.1