diff options
| author | Kees Cook <keescook@chromium.org> | 2023-09-22 10:50:47 -0700 |
|---|---|---|
| committer | Takashi Iwai <tiwai@suse.de> | 2023-09-23 12:36:59 +0200 |
| commit | f5cc9cdfc96fb1f26f986801cee473e2e68ba737 (patch) | |
| tree | 5f386f628fc7f2d982650be6f93849c30b3f5f50 /sound/usb | |
| parent | 81420faff0eb8603c6d5e5267455bddf70f20a95 (diff) | |
ALSA: usx2y: Annotate struct snd_usx2y_urb_seq with __counted_by
Prepare for the coming implementation by GCC and Clang of the __counted_by
attribute. Flexible array members annotated with __counted_by can have
their accesses bounds-checked at run-time checking via CONFIG_UBSAN_BOUNDS
(for array indexing) and CONFIG_FORTIFY_SOURCE (for strcpy/memcpy-family
functions).
As found with Coccinelle[1], add __counted_by for struct snd_usx2y_urb_seq.
Additionally, since the element count member must be set before accessing
the annotated flexible array member, move its initialization earlier.
[1] https://github.com/kees/kernel-tools/blob/trunk/coccinelle/examples/counted_by.cocci
Cc: Jaroslav Kysela <perex@perex.cz>
Cc: Takashi Iwai <tiwai@suse.com>
Cc: alsa-devel@alsa-project.org
Signed-off-by: Kees Cook <keescook@chromium.org>
Link: https://lore.kernel.org/r/20230922175046.work.766-kees@kernel.org
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Diffstat (limited to 'sound/usb')
| -rw-r--r-- | sound/usb/usx2y/usbusx2y.h | 2 | ||||
| -rw-r--r-- | sound/usb/usx2y/usbusx2yaudio.c | 2 |
2 files changed, 2 insertions, 2 deletions
diff --git a/sound/usb/usx2y/usbusx2y.h b/sound/usb/usx2y/usbusx2y.h index 8d82f5cc2fe1..391fd7b4ed5e 100644 --- a/sound/usb/usx2y/usbusx2y.h +++ b/sound/usb/usx2y/usbusx2y.h @@ -18,7 +18,7 @@ struct snd_usx2y_async_seq { struct snd_usx2y_urb_seq { int submitted; int len; - struct urb *urb[]; + struct urb *urb[] __counted_by(len); }; #include "usx2yhwdeppcm.h" diff --git a/sound/usb/usx2y/usbusx2yaudio.c b/sound/usb/usx2y/usbusx2yaudio.c index 5197599e7aa6..ca7888495a9f 100644 --- a/sound/usb/usx2y/usbusx2yaudio.c +++ b/sound/usb/usx2y/usbusx2yaudio.c @@ -681,6 +681,7 @@ static int usx2y_rate_set(struct usx2ydev *usx2y, int rate) err = -ENOMEM; goto cleanup; } + us->len = NOOF_SETRATE_URBS; usbdata = kmalloc_array(NOOF_SETRATE_URBS, sizeof(int), GFP_KERNEL); if (!usbdata) { @@ -702,7 +703,6 @@ static int usx2y_rate_set(struct usx2ydev *usx2y, int rate) if (err < 0) goto cleanup; us->submitted = 0; - us->len = NOOF_SETRATE_URBS; usx2y->us04 = us; wait_event_timeout(usx2y->in04_wait_queue, !us->len, HZ); usx2y->us04 = NULL; |