ktest.pl: Check kernelrelease return in get_version

commit a4e17a8f239a545c463f8ec27db4ed6e74b31841 upstream.

In the case of a test that uses the special option ${KERNEL_VERSION} in one
of its settings but has no configuration available in ${OUTPUT_DIR}, for
example if it's a new empty directory, then the `make kernelrelease` call
will fail and the subroutine will chomp an empty string, silently. Fix that
by adding an empty configuration and retrying.

Cc: stable@vger.kernel.org
Cc: John Hawley <warthog9@eaglescrag.net>
Fixes: 5f9b6ced04a4e ("ktest: Bisecting, install modules, add logging")
Link: https://lore.kernel.org/20241205-ktest_kver_fallback-v2-1-869dae4c7777@suse.com
Signed-off-by: Ricardo B. Marliere <rbm@suse.com>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/tools/testing/ktest/ktest.pl b/tools/testing/ktest/ktest.pl
index f7f371a91ed97af80a94ad53ac0b208234e2da76..aecea16cbd02f1f7fd5585c0170549a1745c2171 100755 (executable)
--- a/tools/testing/ktest/ktest.pl
+++ b/tools/testing/ktest/ktest.pl
@@ -2399,6 +2399,11 @@ sub get_version {
     return if ($have_version);
     doprint "$make kernelrelease ... ";
     $version = `$make -s kernelrelease | tail -1`;
+    if (!length($version)) {
+       run_command "$make allnoconfig" or return 0;
+       doprint "$make kernelrelease ... ";
+       $version = `$make -s kernelrelease | tail -1`;
+    }
     chomp($version);
     doprint "$version\n";
     $have_version = 1;