perf dso: Fix heap overflow in dso__get_filename() on decompressed path

dso__get_filename() allocates name with malloc(PATH_MAX), but the
dso__filename_with_chroot() path replaces name with an asprintf'd
exact-size string (e.g. 8 bytes for "/a/b.ko").  When the DSO needs
decompression, dso__decompress_kmodule_path() writes the temp path
("/tmp/perf-kmod-XXXXXX", 22 bytes) into newpath, and strcpy(name,
newpath) overflows the smaller allocation.

Replace the strcpy with strdup(newpath) + free(name) so the buffer
is always correctly sized for its content.

Reported-by: sashiko-bot <sashiko-bot@kernel.org>
Fixes: 1d6b3c9ba756a513 ("perf tools: Decompress kernel module when reading DSO data")
Reviewed-by: Ian Rogers <irogers@google.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Assisted-by: Claude:claude-opus-4.6
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

0 files changed, 0 insertions, 0 deletions