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ALSA: bits vs bytes bug in snd_card_create() 

The test here is intended intended to prevent shift wrapping bugs when
we do "1U << idx2".  We should consider the number of bits in a u32
instead of the number of bytes.

[fix another chunk similarly by tiwai]

Fixes: 7bb2491b35a2 ('ALSA: Add kconfig to specify the max card numbers')
Change-Id: Ia4b36f3fdb3920a0640b8891253df12bbca88c73
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Dan Carpenter 2014-01-23 11:21:28 +03:00 committed by syphyr
parent bccb64a9a7
commit e8a546ae5a
1 changed files with 2 additions and 2 deletions
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4
sound/core/init.c
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@ -219,7 +219,7 @@ int snd_card_create(int idx, const char *xid,
if (idx < 0) {
for (idx2 = 0; idx2 < SNDRV_CARDS; idx2++) {
/* idx == -1 == 0xffff means: take any free slot */
if (idx2 < sizeof(int) && !(idx & (1U << idx2)))
if (idx2 < 32 && !(idx & (1U << idx2)))
continue;
if (!test_bit(idx2, snd_cards_lock)) {
if (module_slot_match(module, idx2)) {
@ -232,7 +232,7 @@ int snd_card_create(int idx, const char *xid,
if (idx < 0) {
for (idx2 = 0; idx2 < SNDRV_CARDS; idx2++) {
/* idx == -1 == 0xffff means: take any free slot */
if (idx2 < sizeof(int) && !(idx & (1U << idx2)))
if (idx2 < 32 && !(idx & (1U << idx2)))
continue;
if (!test_bit(idx2, snd_cards_lock)) {
if (!slots[idx2] || !*slots[idx2]) {