[PATCH 3/5] perf jitdump: Free unwinding data even when eh_frame_hdr_size is zero

[Arnaldo Carvalho de Melo]

From: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>

jit_repipe_code_load() only cleared the unwinding state when both
unwinding_data and eh_frame_hdr_size were set.  When a record carries
unwinding data but eh_frame_hdr_size is 0, the cleanup condition fails
and the unwinding state persists in jd, being applied to all subsequent
JIT_CODE_LOAD and JIT_CODE_MOVE records, duplicating unwinding sections
in the generated ELF files and inflating their event->mmap2.len.

The record is validated upstream so eh_frame_hdr_size <= unwinding_size
always holds.  Free the unwinding data based on the data pointer alone.

Reported-by: sashiko-bot <sashiko-bot@xxxxxxxxxx>
Cc: Stephane Eranian <eranian@xxxxxxxxxx>
Assisted-by: LLM
Signed-off-by: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
---
 tools/perf/util/jitdump.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tools/perf/util/jitdump.c b/tools/perf/util/jitdump.c
index e0d5cc9a828189a2..efb40d93e33ae664 100644
--- a/tools/perf/util/jitdump.c
+++ b/tools/perf/util/jitdump.c
@@ -530,7 +530,7 @@ static int jit_repipe_code_load(struct jit_buf_desc *jd, union jr_entry *jr)
 		jd->nr_debug_entries = 0;
 	}
 
-	if (jd->unwinding_data && jd->eh_frame_hdr_size) {
+	if (jd->unwinding_data) {
 		zfree(&jd->unwinding_data);
 		jd->eh_frame_hdr_size = 0;
 		jd->unwinding_mapped_size = 0;
-- 
2.55.0