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sound: fix a memory leak bug

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In sound_insert_unit(), the controlling structure 's' is allocated through
kmalloc(). Then it is added to the sound driver list by invoking
__sound_insert_unit(). Later on, if __register_chrdev() fails, 's' is
removed from the list through __sound_remove_unit(). If 'index' is not less
than 0, -EBUSY is returned to indicate the error. However, 's' is not
deallocated on this execution path, leading to a memory leak bug.

To fix the above issue, free 's' before -EBUSY is returned.

Signed-off-by: Wenwen Wang <wenwen@cs.uga.edu>
Cc: <stable@vger.kernel.org>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Wenwen Wang 2019-08-08 00:15:21 -05:00 committed by Takashi Iwai
parent c02f77d32d
commit c7cd7c748a
1 changed files with 2 additions and 1 deletions
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3
sound/sound_core.c
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@ -275,7 +275,8 @@ static int sound_insert_unit(struct sound_unit **list, const struct file_operati
goto retry;
}
spin_unlock(&sound_loader_lock);
return -EBUSY;
r = -EBUSY;
goto fail;
}
}