From: Dan Carpenter Date: Thu, 23 Jan 2014 08:21:28 +0000 (+0300) Subject: ALSA: bits vs bytes bug in snd_card_create() X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=4c3773eda49c872a3034382f8ec3080002e715bf;p=linux-beck.git 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') Signed-off-by: Dan Carpenter Cc: Signed-off-by: Takashi Iwai --- diff --git a/sound/core/init.c b/sound/core/init.c index 1351f22f651c..e3c93cd77ee7 100644 --- a/sound/core/init.c +++ b/sound/core/init.c @@ -170,7 +170,7 @@ 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)) { @@ -183,7 +183,7 @@ 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]) {