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| author | Jiri Slaby <jslaby@suse.cz> | 2010-06-21 19:03:21 +0400 |
|---|---|---|
| committer | Takashi Iwai <tiwai@suse.de> | 2010-06-21 19:07:58 +0400 |
| commit | 272cbc98cfbdd30cff37a35f8ad8f1b737288e88 (patch) | |
| tree | 9ac944574d3a98e106a11d362cb69293cacb0d48 /sound/usb | |
| parent | 2a383cb3f1a571b281c2e1ace4c8491f0370e866 (diff) | |
| download | linux-272cbc98cfbdd30cff37a35f8ad8f1b737288e88.tar.xz | |
ALSA: usb/endpoint, fix dangling pointer use
Stanse found that in snd_usb_parse_audio_endpoints, there is a
dangling pointer dereference. When snd_usb_parse_audio_format fails,
fp is freed, and continue invoked. On the next loop, there is
"fp && fp->altsetting == 1 && fp->channels == 1" test, but fp is set
from the last iteration (but is bogus) and thus ilegally dereferenced.
Set fp to NULL before "continue".
Signed-off-by: Jiri Slaby <jslaby@suse.cz>
Acked-by: Daniel Mack <daniel@caiaq.de>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Diffstat (limited to 'sound/usb')
| -rw-r--r-- | sound/usb/endpoint.c | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/sound/usb/endpoint.c b/sound/usb/endpoint.c index 9593b91452b9..6f6596cf2b19 100644 --- a/sound/usb/endpoint.c +++ b/sound/usb/endpoint.c @@ -427,6 +427,7 @@ int snd_usb_parse_audio_endpoints(struct snd_usb_audio *chip, int iface_no) if (snd_usb_parse_audio_format(chip, fp, format, fmt, stream, alts) < 0) { kfree(fp->rate_table); kfree(fp); + fp = NULL; continue; } |