[PATCH 1/1] ALSA: ctxfi: Fix memory leakage when clearing DAO input mappers

[Harin Lee <me@harin.net>]

Commit e576e7843c0d ("ALSA: ctxfi: Simplify dao_clear_{left,right}_input() functions")
centralized the DAO input mapper clearing logic in
dao_clear_input(), but omitted the kfree() calls.

It removes the mapper entries from the list and sets their pointers
to NULL without freeing the allocated array. This leaks memory each
time dao_clear_input() is called.

Store the base pointer of the allocation before clearing the mapper
entries and free the array after removing entries from the list.

Fixes: e576e7843c0d ("ALSA: ctxfi: Simplify dao_clear_{left,right}_input() functions")
Cc: stable@vger.kernel.org
Signed-off-by: Harin Lee <me@harin.net>
---
 sound/pci/ctxfi/ctdaio.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/sound/pci/ctxfi/ctdaio.c b/sound/pci/ctxfi/ctdaio.c
index 9be70c6862ab..27e502fa493e 100644
--- a/sound/pci/ctxfi/ctdaio.c
+++ b/sound/pci/ctxfi/ctdaio.c
@@ -221,14 +221,18 @@ static int dao_set_right_input(struct dao *dao, struct rsc *input)
 
 static int dao_clear_input(struct dao *dao, unsigned int start, unsigned int end)
 {
+	struct imapper *entry;
 	unsigned int i;
 
-	if (!dao->imappers[start])
+	entry = dao->imappers[start];
+	if (!entry)
 		return 0;
+
 	for (i = start; i < end; i++) {
 		dao->mgr->imap_delete(dao->mgr, dao->imappers[i]);
 		dao->imappers[i] = NULL;
 	}
+	kfree(entry);
 
 	return 0;
 }
-- 
2.55.0