From: Takashi Iwai tiwai@suse.de
stable inclusion from stable-5.10.52 commit 7d7f30cf182e55023fa8fde4c084b2d37c6be69d bugzilla: 175542 https://gitee.com/openeuler/kernel/issues/I4DTKU
Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=...
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[ Upstream commit cae0cf651adccee2c3f376e78f30fbd788d0829f ]
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 Signed-off-by: Sasha Levin sashal@kernel.org Signed-off-by: Chen Jun chenjun102@huawei.com Acked-by: Weilong Chen chenweilong@huawei.com Signed-off-by: Chen Jun chenjun102@huawei.com --- 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 091c071b270a..cff684942c4f 100644 --- a/sound/usb/usx2y/usb_stream.c +++ b/sound/usb/usx2y/usb_stream.c @@ -142,8 +142,11 @@ 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; }