From cae0cf651adccee2c3f376e78f30fbd788d0829f Mon Sep 17 00:00:00 2001
From: Takashi Iwai <tiwai@suse.de>
Date: Mon, 17 May 2021 15:15:43 +0200
Subject: [PATCH] ALSA: usx2y: Don't call free_pages_exact() with NULL address
Git-commit: cae0cf651adccee2c3f376e78f30fbd788d0829f
Patch-mainline: v5.14-rc1
References: git-fixes
Unlike some other functions, we can't pass NULL pointer to
free_pages_exact(). Add a proper NULL check for avoiding possible
Oops.
Link: https://lore.kernel.org/r/20210517131545.27252-10-tiwai@suse.de
Signed-off-by: Takashi Iwai <tiwai@suse.de>
---
sound/usb/usx2y/usb_stream.c | 7 +++++--
1 file changed, 5 insertions(+), 2 deletions(-)
diff --git a/sound/usb/usx2y/usb_stream.c b/sound/usb/usx2y/usb_stream.c
index 820647331aba..9d0e44793896 100644
--- a/sound/usb/usx2y/usb_stream.c
+++ b/sound/usb/usx2y/usb_stream.c
@@ -143,8 +143,11 @@ void usb_stream_free(struct usb_stream_kernel *sk)
if (!s)
return;
- free_pages_exact(sk->write_page, s->write_size);
- sk->write_page = NULL;
+ if (sk->write_page) {
+ free_pages_exact(sk->write_page, s->write_size);
+ sk->write_page = NULL;
+ }
+
free_pages_exact(s, s->read_size);
sk->s = NULL;
}
--
2.26.2