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perf header: Sanity check HEADER_HYBRID_TOPOLOGY

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Add upper bound check on nr_nodes in process_hybrid_topology() to
harden against malformed perf.data files (reuses MAX_PMU_MAPPINGS,
4096).

Cc: Ian Rogers <irogers@google.com>
Assisted-by: Claude Code:claude-opus-4-6
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Signed-off-by: Namhyung Kim <namhyung@kernel.org>
This commit is contained in:
Arnaldo Carvalho de Melo 2026-04-10 19:09:02 -03:00 committed by Namhyung Kim
parent 110a661708
commit 47c68eb15a
1 changed files with 12 additions and 0 deletions
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12
tools/perf/util/header.c
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@ -3450,6 +3450,18 @@ static int process_hybrid_topology(struct feat_fd *ff,
if (do_read_u32(ff, &nr))
return -1;
if (nr > MAX_PMU_MAPPINGS) {
pr_err("Invalid HEADER_HYBRID_TOPOLOGY: nr_nodes (%u) > %u\n",
nr, MAX_PMU_MAPPINGS);
return -1;
}
if (ff->size < sizeof(u32) + nr * 2 * sizeof(u32)) {
pr_err("Invalid HEADER_HYBRID_TOPOLOGY: section too small (%zu) for %u nodes\n",
ff->size, nr);
return -1;
}
nodes = calloc(nr, sizeof(*nodes));
if (!nodes)
return -ENOMEM;