ALSA: hda: Fix krealloc() with __GFP_ZERO usage

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>

1 files changed, 3 insertions, 1 deletions

diff --git a/sound/hda/array.c b/sound/hda/array.c
index 516795baa7db..5dfa610e4471 100644
--- a/sound/hda/array.c
+++ b/sound/hda/array.c
@@ -21,13 +21,15 @@ void *snd_array_new(struct snd_array *array)
                 return NULL;
         if (array->used >= array->alloced) {
                 int num = array->alloced + array->alloc_align;
+                int oldsize = array->alloced * array->elem_size;
                 int size = (num + 1) * array->elem_size;
                 void *nlist;
                 if (snd_BUG_ON(num >= 4096))
                         return NULL;
-                nlist = krealloc(array->list, size, GFP_KERNEL | __GFP_ZERO);
+                nlist = krealloc(array->list, size, GFP_KERNEL);
                 if (!nlist)
                         return NULL;
+                memset(nlist + oldsize, 0, size - oldsize);
                 array->list = nlist;
                 array->alloced = num;
         }