* sound/pci/emu10k1/voice.c:62 voice_alloc() error: potentially dereferencing uninitialized 'voice'.
@ 2023-10-20 21:56 kernel test robot
0 siblings, 0 replies; only message in thread
From: kernel test robot @ 2023-10-20 21:56 UTC (permalink / raw)
To: oe-kbuild; +Cc: lkp, Dan Carpenter
BCC: lkp@intel.com
CC: oe-kbuild-all@lists.linux.dev
CC: linux-kernel@vger.kernel.org
TO: Oswald Buddenhagen <oswald.buddenhagen@gmx.de>
CC: Takashi Iwai <tiwai@suse.de>
tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head: c3200081020d63f6c6bfd8a6db2ae8a5b99b348a
commit: a915d60426d4348a0b91f9870e299056fd604a32 ALSA: emu10k1: revamp playback voice allocator
date: 5 months ago
:::::: branch date: 4 hours ago
:::::: commit date: 5 months ago
config: x86_64-randconfig-161-20231019 (https://download.01.org/0day-ci/archive/20231021/202310210519.CDJVqqYI-lkp@intel.com/config)
compiler: gcc-12 (Debian 12.2.0-14) 12.2.0
reproduce: (https://download.01.org/0day-ci/archive/20231021/202310210519.CDJVqqYI-lkp@intel.com/reproduce)
If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@intel.com>
| Reported-by: Dan Carpenter <error27@gmail.com>
| Closes: https://lore.kernel.org/r/202310210519.CDJVqqYI-lkp@intel.com/
smatch warnings:
sound/pci/emu10k1/voice.c:62 voice_alloc() error: potentially dereferencing uninitialized 'voice'.
sound/pci/emu10k1/voice.c:124 snd_emu10k1_voice_alloc() error: uninitialized symbol 'result'.
vim +/voice +62 sound/pci/emu10k1/voice.c
^1da177e4c3f41 Linus Torvalds 2005-04-16 21
^1da177e4c3f41 Linus Torvalds 2005-04-16 22 /* Previously the voice allocator started at 0 every time. The new voice
^1da177e4c3f41 Linus Torvalds 2005-04-16 23 * allocator uses a round robin scheme. The next free voice is tracked in
^1da177e4c3f41 Linus Torvalds 2005-04-16 24 * the card record and each allocation begins where the last left off. The
^1da177e4c3f41 Linus Torvalds 2005-04-16 25 * hardware requires stereo interleaved voices be aligned to an even/odd
a915d60426d434 Oswald Buddenhagen 2023-05-18 26 * boundary.
^1da177e4c3f41 Linus Torvalds 2005-04-16 27 * --rlrevell
^1da177e4c3f41 Linus Torvalds 2005-04-16 28 */
^1da177e4c3f41 Linus Torvalds 2005-04-16 29
eb4698f347ec90 Takashi Iwai 2005-11-17 30 static int voice_alloc(struct snd_emu10k1 *emu, int type, int number,
b4fea2d3f25b5f Oswald Buddenhagen 2023-05-18 31 struct snd_emu10k1_pcm *epcm, struct snd_emu10k1_voice **rvoice)
^1da177e4c3f41 Linus Torvalds 2005-04-16 32 {
eb4698f347ec90 Takashi Iwai 2005-11-17 33 struct snd_emu10k1_voice *voice;
a915d60426d434 Oswald Buddenhagen 2023-05-18 34 int i, j, k, skip;
^1da177e4c3f41 Linus Torvalds 2005-04-16 35
a915d60426d434 Oswald Buddenhagen 2023-05-18 36 for (i = emu->next_free_voice, j = 0; j < NUM_G; i = (i + skip) % NUM_G, j += skip) {
28a97c194cec47 Takashi Iwai 2009-02-05 37 /*
6f002b02166cc0 Takashi Iwai 2014-02-25 38 dev_dbg(emu->card->dev, "i %d j %d next free %d!\n",
28a97c194cec47 Takashi Iwai 2009-02-05 39 i, j, emu->next_free_voice);
28a97c194cec47 Takashi Iwai 2009-02-05 40 */
^1da177e4c3f41 Linus Torvalds 2005-04-16 41
^1da177e4c3f41 Linus Torvalds 2005-04-16 42 /* stereo voices must be even/odd */
a915d60426d434 Oswald Buddenhagen 2023-05-18 43 if ((number > 1) && (i % 2)) {
a915d60426d434 Oswald Buddenhagen 2023-05-18 44 skip = 1;
^1da177e4c3f41 Linus Torvalds 2005-04-16 45 continue;
^1da177e4c3f41 Linus Torvalds 2005-04-16 46 }
^1da177e4c3f41 Linus Torvalds 2005-04-16 47
^1da177e4c3f41 Linus Torvalds 2005-04-16 48 for (k = 0; k < number; k++) {
a915d60426d434 Oswald Buddenhagen 2023-05-18 49 voice = &emu->voices[i + k];
^1da177e4c3f41 Linus Torvalds 2005-04-16 50 if (voice->use) {
a915d60426d434 Oswald Buddenhagen 2023-05-18 51 skip = k + 1;
a915d60426d434 Oswald Buddenhagen 2023-05-18 52 goto next;
^1da177e4c3f41 Linus Torvalds 2005-04-16 53 }
^1da177e4c3f41 Linus Torvalds 2005-04-16 54 }
^1da177e4c3f41 Linus Torvalds 2005-04-16 55
a915d60426d434 Oswald Buddenhagen 2023-05-18 56 for (k = 0; k < number; k++) {
a915d60426d434 Oswald Buddenhagen 2023-05-18 57 voice = &emu->voices[i + k];
b840f8d8fcb3df Oswald Buddenhagen 2023-05-18 58 voice->use = type;
b4fea2d3f25b5f Oswald Buddenhagen 2023-05-18 59 voice->epcm = epcm;
a915d60426d434 Oswald Buddenhagen 2023-05-18 60 /* dev_dbg(emu->card->dev, "allocated voice %d\n", i + k); */
^1da177e4c3f41 Linus Torvalds 2005-04-16 61 }
a915d60426d434 Oswald Buddenhagen 2023-05-18 @62 voice->last = 1;
a915d60426d434 Oswald Buddenhagen 2023-05-18 63
a915d60426d434 Oswald Buddenhagen 2023-05-18 64 *rvoice = &emu->voices[i];
a915d60426d434 Oswald Buddenhagen 2023-05-18 65 emu->next_free_voice = (i + number) % NUM_G;
^1da177e4c3f41 Linus Torvalds 2005-04-16 66 return 0;
a915d60426d434 Oswald Buddenhagen 2023-05-18 67
a915d60426d434 Oswald Buddenhagen 2023-05-18 68 next: ;
a915d60426d434 Oswald Buddenhagen 2023-05-18 69 }
a915d60426d434 Oswald Buddenhagen 2023-05-18 70 return -ENOMEM; // -EBUSY would have been better
^1da177e4c3f41 Linus Torvalds 2005-04-16 71 }
^1da177e4c3f41 Linus Torvalds 2005-04-16 72
3eb5b1d0a11d1d Oswald Buddenhagen 2023-05-18 73 static void voice_free(struct snd_emu10k1 *emu,
3eb5b1d0a11d1d Oswald Buddenhagen 2023-05-18 74 struct snd_emu10k1_voice *pvoice)
3eb5b1d0a11d1d Oswald Buddenhagen 2023-05-18 75 {
82a9fa6e9e3c76 Oswald Buddenhagen 2023-05-18 76 if (pvoice->dirty)
3eb5b1d0a11d1d Oswald Buddenhagen 2023-05-18 77 snd_emu10k1_voice_init(emu, pvoice->number);
3eb5b1d0a11d1d Oswald Buddenhagen 2023-05-18 78 pvoice->interrupt = NULL;
a915d60426d434 Oswald Buddenhagen 2023-05-18 79 pvoice->use = pvoice->dirty = pvoice->last = 0;
3eb5b1d0a11d1d Oswald Buddenhagen 2023-05-18 80 pvoice->epcm = NULL;
3eb5b1d0a11d1d Oswald Buddenhagen 2023-05-18 81 }
3eb5b1d0a11d1d Oswald Buddenhagen 2023-05-18 82
a915d60426d434 Oswald Buddenhagen 2023-05-18 83 int snd_emu10k1_voice_alloc(struct snd_emu10k1 *emu, int type, int count, int channels,
b4fea2d3f25b5f Oswald Buddenhagen 2023-05-18 84 struct snd_emu10k1_pcm *epcm, struct snd_emu10k1_voice **rvoice)
^1da177e4c3f41 Linus Torvalds 2005-04-16 85 {
^1da177e4c3f41 Linus Torvalds 2005-04-16 86 unsigned long flags;
^1da177e4c3f41 Linus Torvalds 2005-04-16 87 int result;
^1da177e4c3f41 Linus Torvalds 2005-04-16 88
da3cec35dd3c31 Takashi Iwai 2008-08-08 89 if (snd_BUG_ON(!rvoice))
da3cec35dd3c31 Takashi Iwai 2008-08-08 90 return -EINVAL;
a915d60426d434 Oswald Buddenhagen 2023-05-18 91 if (snd_BUG_ON(!count))
a915d60426d434 Oswald Buddenhagen 2023-05-18 92 return -EINVAL;
a915d60426d434 Oswald Buddenhagen 2023-05-18 93 if (snd_BUG_ON(!channels))
da3cec35dd3c31 Takashi Iwai 2008-08-08 94 return -EINVAL;
^1da177e4c3f41 Linus Torvalds 2005-04-16 95
^1da177e4c3f41 Linus Torvalds 2005-04-16 96 spin_lock_irqsave(&emu->voice_lock, flags);
a915d60426d434 Oswald Buddenhagen 2023-05-18 97 for (int got = 0; got < channels; ) {
a915d60426d434 Oswald Buddenhagen 2023-05-18 98 result = voice_alloc(emu, type, count, epcm, &rvoice[got]);
a915d60426d434 Oswald Buddenhagen 2023-05-18 99 if (result == 0) {
a915d60426d434 Oswald Buddenhagen 2023-05-18 100 got++;
a915d60426d434 Oswald Buddenhagen 2023-05-18 101 /*
a915d60426d434 Oswald Buddenhagen 2023-05-18 102 dev_dbg(emu->card->dev, "voice alloc - %i, %i of %i\n",
a915d60426d434 Oswald Buddenhagen 2023-05-18 103 rvoice[got - 1]->number, got, want);
a915d60426d434 Oswald Buddenhagen 2023-05-18 104 */
a915d60426d434 Oswald Buddenhagen 2023-05-18 105 continue;
a915d60426d434 Oswald Buddenhagen 2023-05-18 106 }
a915d60426d434 Oswald Buddenhagen 2023-05-18 107 if (type != EMU10K1_SYNTH && emu->get_synth_voice) {
^1da177e4c3f41 Linus Torvalds 2005-04-16 108 /* free a voice from synth */
^1da177e4c3f41 Linus Torvalds 2005-04-16 109 result = emu->get_synth_voice(emu);
a915d60426d434 Oswald Buddenhagen 2023-05-18 110 if (result >= 0) {
3eb5b1d0a11d1d Oswald Buddenhagen 2023-05-18 111 voice_free(emu, &emu->voices[result]);
a915d60426d434 Oswald Buddenhagen 2023-05-18 112 continue;
a915d60426d434 Oswald Buddenhagen 2023-05-18 113 }
a915d60426d434 Oswald Buddenhagen 2023-05-18 114 }
a915d60426d434 Oswald Buddenhagen 2023-05-18 115 for (int i = 0; i < got; i++) {
a915d60426d434 Oswald Buddenhagen 2023-05-18 116 for (int j = 0; j < count; j++)
a915d60426d434 Oswald Buddenhagen 2023-05-18 117 voice_free(emu, rvoice[i] + j);
a915d60426d434 Oswald Buddenhagen 2023-05-18 118 rvoice[i] = NULL;
^1da177e4c3f41 Linus Torvalds 2005-04-16 119 }
^1da177e4c3f41 Linus Torvalds 2005-04-16 120 break;
^1da177e4c3f41 Linus Torvalds 2005-04-16 121 }
^1da177e4c3f41 Linus Torvalds 2005-04-16 122 spin_unlock_irqrestore(&emu->voice_lock, flags);
^1da177e4c3f41 Linus Torvalds 2005-04-16 123
^1da177e4c3f41 Linus Torvalds 2005-04-16 @124 return result;
^1da177e4c3f41 Linus Torvalds 2005-04-16 125 }
^1da177e4c3f41 Linus Torvalds 2005-04-16 126
--
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki
^ permalink raw reply [flat|nested] only message in thread
only message in thread, other threads:[~2023-10-20 21:57 UTC | newest]
Thread overview: (only message) (download: mbox.gz follow: Atom feed
-- links below jump to the message on this page --
2023-10-20 21:56 sound/pci/emu10k1/voice.c:62 voice_alloc() error: potentially dereferencing uninitialized 'voice' kernel test robot
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.