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perf annotate: Fix memcpy size in arch__grow_instructions()

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The memcpy() in arch__grow_instructions() is copying the wrong number of
bytes when growing from a non-allocated table.

It should copy arch->nr_instructions * sizeof(struct ins) bytes, not
just arch->nr_instructions bytes.

This bug causes data corruption as only a partial copy of the
instruction table is made, leading to garbage data in most entries and
potential crashes

Fixes: 2a1ff812c4 ("perf annotate: Introduce alternative method of keeping instructions table")
Reviewed-by: Ian Rogers <irogers@google.com>
Signed-off-by: Suchit Karunakaran <suchitkarunakaran@gmail.com>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: James Clark <james.clark@linaro.org>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Suchit Karunakaran 2026-01-22 22:47:04 +05:30 committed by Arnaldo Carvalho de Melo
parent c5e47e4d00
commit f0d98c78f8
1 changed files with 1 additions and 1 deletions
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2
tools/perf/util/disasm.c
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@ -82,7 +82,7 @@ static int arch__grow_instructions(struct arch *arch)
if (new_instructions == NULL)
return -1;
memcpy(new_instructions, arch->instructions, arch->nr_instructions);
memcpy(new_instructions, arch->instructions, arch->nr_instructions * sizeof(struct ins));
goto out_update_instructions;
}