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| author | Takashi Iwai <tiwai@suse.de> | 2022-09-30 12:01:29 +0200 |
|---|---|---|
| committer | Takashi Iwai <tiwai@suse.de> | 2022-09-30 12:02:42 +0200 |
| commit | 568be8aaf8a535f79c4db76cabe17b035aa2584d (patch) | |
| tree | 389abcf32ef6d2d76c432c25dc0987ae679551b1 /sound/usb | |
| parent | 35a1744423743247026668e2323d1b932583fc2a (diff) | |
| download | lwn-568be8aaf8a535f79c4db76cabe17b035aa2584d.tar.gz lwn-568be8aaf8a535f79c4db76cabe17b035aa2584d.zip | |
ALSA: usb-audio: Fix NULL dererence at error path
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+tzYng@mail.gmail.com
Link: https://lore.kernel.org/r/20220930100129.19445-1-tiwai@suse.de
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Diffstat (limited to 'sound/usb')
| -rw-r--r-- | sound/usb/endpoint.c | 3 |
1 files changed, 2 insertions, 1 deletions
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) |