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authorTakashi Iwai <tiwai@suse.de>2011-10-13 08:19:09 +0200
committerTakashi Iwai <tiwai@suse.de>2011-10-13 08:19:09 +0200
commitd09c06c6fc240261dde65198774b279d89c35459 (patch)
treeefd2c6881892a6b0ced0b29743a85d814721af17 /sound/usb
parente653510a27e63b41a5bae3c46eb093375e17ca2d (diff)
ALSA: usb-audio - Fix possible access over audio_feature_info[] array
The audio_feature_info[] array should contain all entries for UAC2_FU_*, but currently a few last entries are missing. Even though, the driver tries to probe these entries in parse_audio_feature_unit() and may access the range over the array. This patch fixes the bug by limiting the loop size properly using ARRAY_SIZE() instead of a hard-coded magic number. Reported-by: Dan Carpenter <dan.carpenter@oracle.com> Signed-off-by: Takashi Iwai <tiwai@suse.de>
Diffstat (limited to 'sound/usb')
-rw-r--r--sound/usb/mixer.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/sound/usb/mixer.c b/sound/usb/mixer.c
index b13b7ac5bad9..60f65ace7474 100644
--- a/sound/usb/mixer.c
+++ b/sound/usb/mixer.c
@@ -1259,7 +1259,7 @@ static int parse_audio_feature_unit(struct mixer_build *state, int unitid, void
build_feature_ctl(state, _ftr, 0, i, &iterm, unitid, 0);
}
} else { /* UAC_VERSION_2 */
- for (i = 0; i < 30/2; i++) {
+ for (i = 0; i < ARRAY_SIZE(audio_feature_info); i++) {
unsigned int ch_bits = 0;
unsigned int ch_read_only = 0;