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ALSA: seq: Fix leak of pool buffer at concurrent writes

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When multiple concurrent writes happen on the ALSA sequencer device
right after the open, it may try to allocate vmalloc buffer for each
write and leak some of them.  It's because the presence check and the
assignment of the buffer is done outside the spinlock for the pool.

The fix is to move the check and the assignment into the spinlock.

(The current implementation is suboptimal, as there can be multiple
 unnecessary vmallocs because the allocation is done before the check
 in the spinlock.  But the pool size is already checked beforehand, so
 this isn't a big problem; that is, the only possible path is the
 multiple writes before any pool assignment, and practically seen, the
 current coverage should be "good enough".)

The issue was triggered by syzkaller fuzzer.

BugLink: http://lkml.kernel.org/r/CACT4Y+bSzazpXNvtAr=WXaL8hptqjHwqEyFA+VN2AWEx=aurkg@mail.gmail.com
Reported-by: Dmitry Vyukov <dvyukov@google.com>
Tested-by: Dmitry Vyukov <dvyukov@google.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Takashi Iwai 2016-02-15 16:20:24 +01:00
parent 07d86ca93d
commit d99a36f472
1 changed files with 9 additions and 4 deletions
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13
sound/core/seq/seq_memory.c
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@ -383,15 +383,20 @@ int snd_seq_pool_init(struct snd_seq_pool *pool)
if (snd_BUG_ON(!pool))
return -EINVAL;
if (pool->ptr) /* should be atomic? */
return 0;
pool->ptr = vmalloc(sizeof(struct snd_seq_event_cell) * pool->size);
if (!pool->ptr)
cellptr = vmalloc(sizeof(struct snd_seq_event_cell) * pool->size);
if (!cellptr)
return -ENOMEM;
/* add new cells to the free cell list */
spin_lock_irqsave(&pool->lock, flags);
if (pool->ptr) {
spin_unlock_irqrestore(&pool->lock, flags);
vfree(cellptr);
return 0;
}
pool->ptr = cellptr;
pool->free = NULL;
for (cell = 0; cell < pool->size; cell++) {