33baefe5e7
krealloc() doesn't work always properly with __GFP_ZERO flag as expected. For clearing the reallocated area, we need to clear explicitly instead. Reported-by: Joe Perches <joe@perches.com> Cc: <stable@vger.kernel.org> Signed-off-by: Takashi Iwai <tiwai@suse.de>
51 lines
1.2 KiB
C
51 lines
1.2 KiB
C
/*
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* generic arrays
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*/
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#include <linux/slab.h>
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#include <sound/core.h>
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#include <sound/hdaudio.h>
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/**
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* snd_array_new - get a new element from the given array
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* @array: the array object
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*
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* Get a new element from the given array. If it exceeds the
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* pre-allocated array size, re-allocate the array.
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*
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* Returns NULL if allocation failed.
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*/
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void *snd_array_new(struct snd_array *array)
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{
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if (snd_BUG_ON(!array->elem_size))
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return NULL;
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if (array->used >= array->alloced) {
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int num = array->alloced + array->alloc_align;
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int oldsize = array->alloced * array->elem_size;
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int size = (num + 1) * array->elem_size;
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void *nlist;
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if (snd_BUG_ON(num >= 4096))
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return NULL;
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nlist = krealloc(array->list, size, GFP_KERNEL);
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if (!nlist)
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return NULL;
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memset(nlist + oldsize, 0, size - oldsize);
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array->list = nlist;
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array->alloced = num;
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}
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return snd_array_elem(array, array->used++);
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}
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EXPORT_SYMBOL_GPL(snd_array_new);
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/**
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* snd_array_free - free the given array elements
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* @array: the array object
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*/
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void snd_array_free(struct snd_array *array)
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{
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kfree(array->list);
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array->used = 0;
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array->alloced = 0;
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array->list = NULL;
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}
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EXPORT_SYMBOL_GPL(snd_array_free);
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