[PATCH 4.9 224/310] perf tools: Decompress kernel module when reading DSO data

[Greg Kroah-Hartman]

4.9-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Namhyung Kim <namhy...@kernel.org>


[ Upstream commit 1d6b3c9ba756a5134fd7ad1959acac776d17404b ]

Currently perf decompresses kernel modules when loading the symbol table
but it missed to do it when reading raw data.

Signed-off-by: Namhyung Kim <namhy...@kernel.org>
Acked-by: Jiri Olsa <jo...@kernel.org>
Cc: Adrian Hunter <adrian.hun...@intel.com>
Cc: David Ahern <dsah...@gmail.com>
Cc: Peter Zijlstra <a.p.zijls...@chello.nl>
Cc: Wang Nan <wangn...@huawei.com>
Cc: kernel-t...@lge.com
Link: http://lkml.kernel.org/r/20170608073109.30699-6-namhy...@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <a...@redhat.com>
Signed-off-by: Sasha Levin <alexander.le...@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gre...@linuxfoundation.org>
---
 tools/perf/util/dso.c |   16 ++++++++++++++++
 1 file changed, 16 insertions(+)

--- a/tools/perf/util/dso.c
+++ b/tools/perf/util/dso.c
@@ -366,7 +366,23 @@ static int __open_dso(struct dso *dso, s
        if (!is_regular_file(name))
                return -EINVAL;
 
+       if (dso__needs_decompress(dso)) {
+               char newpath[KMOD_DECOMP_LEN];
+               size_t len = sizeof(newpath);
+
+               if (dso__decompress_kmodule_path(dso, name, newpath, len) < 0) {
+                       free(name);
+                       return -dso->load_errno;
+               }
+
+               strcpy(name, newpath);
+       }
+
        fd = do_open(name);
+
+       if (dso__needs_decompress(dso))
+               unlink(name);
+
        free(name);
        return fd;
 }