common/rc: cleanup old .kmemleak files

I've spent a non-negligible amount of time looking into a kmemleak that
didn't exist in the code I was testing because there was an old .kmemleak
file in the results directory.  I don't think this is an intended behaviour,
so I'm proposing to remove these files everytime we capture the result of a
new scan.

Signed-off-by: Luís Henriques <lhenriques@suse.de>
Reviewed-by: Darrick J. Wong <djwong@kernel.org>
Signed-off-by: Zorro Lang <zlang@kernel.org>

1 files changed, 4 insertions, 0 deletions

diff --git a/common/rc b/common/rc
index 741579af82..5c4429ed04 100644
--- a/common/rc
+++ b/common/rc
@@ -4433,6 +4433,10 @@ _capture_kmemleak()
 	local kern_knob="$DEBUGFS_MNT/kmemleak"
 	local leak_file="$1"
 
+	# Some callers pass in /dev/null when they want to clear the
+	# kernel's leak report file and do not care what was in that.
+	[ -f "$leak_file" ] && rm -f "$leak_file"
+
 	# Tell the kernel to scan for memory leaks.  Apparently the write
 	# returns before the scan is complete, so do it twice in the hopes
 	# that twice is enough to capture all the leaks.