diff options
| author | Cássio Gabriel <cassiogabrielcontato@gmail.com> | 2026-05-19 00:32:15 -0300 |
|---|---|---|
| committer | Takashi Iwai <tiwai@suse.de> | 2026-05-19 08:08:41 +0200 |
| commit | b59d5c51bb328a60749b4dd5fe7e649bfb4089b4 (patch) | |
| tree | a39ed5d8d6614c419c88e36560fd34673d58552f | |
| parent | 9e5fb6098d21e1f9be9982b46c3e5b8329d4e7d2 (diff) | |
| download | linux-next-history-b59d5c51bb328a60749b4dd5fe7e649bfb4089b4.tar.gz | |
ALSA: ua101: Reject too-short USB descriptors
find_format_descriptor() walks the class-specific interface extras by
advancing with bLength. It rejects descriptors that extend past the
remaining buffer, but it does not reject descriptor lengths smaller than
a USB descriptor header.
Reject too-short descriptors before using bLength to advance the local
scan. This keeps the UA-101 parser robust against malformed descriptor
data and matches the usual USB descriptor walking rules.
Fixes: 63978ab3e3e9 ("sound: add Edirol UA-101 support")
Cc: stable@vger.kernel.org
Signed-off-by: Cássio Gabriel <cassiogabrielcontato@gmail.com>
Link: https://patch.msgid.link/20260519-alsa-ua101-desc-len-v1-1-4307d1a5e054@gmail.com
Signed-off-by: Takashi Iwai <tiwai@suse.de>
| -rw-r--r-- | sound/usb/misc/ua101.c | 5 |
1 files changed, 3 insertions, 2 deletions
diff --git a/sound/usb/misc/ua101.c b/sound/usb/misc/ua101.c index d129b42eb979d..b9a62e94e06cb 100644 --- a/sound/usb/misc/ua101.c +++ b/sound/usb/misc/ua101.c @@ -894,8 +894,9 @@ find_format_descriptor(struct usb_interface *interface) struct uac_format_type_i_discrete_descriptor *desc; desc = (struct uac_format_type_i_discrete_descriptor *)extra; - if (desc->bLength > extralen) { - dev_err(&interface->dev, "descriptor overflow\n"); + if (desc->bLength < sizeof(struct usb_descriptor_header) || + desc->bLength > extralen) { + dev_err(&interface->dev, "invalid descriptor length\n"); return NULL; } if (desc->bLength == UAC_FORMAT_TYPE_I_DISCRETE_DESC_SIZE(1) && |