At an error path to release URB buffers and contexts, the driver might hit a NULL dererence for u->urb pointer, when u->buffer_size has been already set but the actual URB allocation failed.
Fix it by adding the NULL check of urb. Also, make sure that buffer_size is cleared after the error path or the close.
Cc: stable@vger.kernel.org Reported-by: Sabri N. Ferreiro snferreiro1@gmail.com Link: https://lore.kernel.org/r/CAKG+3NRjTey+fFfUEGwuxL-pi_=T4cUskYG9OzpzHytF+tzYn... Signed-off-by: Takashi Iwai tiwai@suse.de --- sound/usb/endpoint.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/sound/usb/endpoint.c b/sound/usb/endpoint.c index b2d0b42b581f..36f753a28341 100644 --- a/sound/usb/endpoint.c +++ b/sound/usb/endpoint.c @@ -95,12 +95,13 @@ static inline unsigned get_usb_high_speed_rate(unsigned int rate) */ static void release_urb_ctx(struct snd_urb_ctx *u) { - if (u->buffer_size) + if (u->urb && u->buffer_size) usb_free_coherent(u->ep->chip->dev, u->buffer_size, u->urb->transfer_buffer, u->urb->transfer_dma); usb_free_urb(u->urb); u->urb = NULL; + u->buffer_size = 0; }
static const char *usb_error_string(int err)