Commit 18555734 authored by Ralph Giles's avatar Ralph Giles
Browse files

Set bounds from the array when iterating mmaps.

The mmap allocation code in vp8_dx_iface.c was inconsistent.
The static array vp8_mem_req_segs defines two descriptors,
but only the first is real. The second is a sentinel and
isn't actually allocated, so vpx_codec_alg_priv is declared
with mmaps[NELEMENTS(vp8_mem_req_segs)-1]. Some functions
use this reduced upper bound when iterating though the mmap
array, but these two functions did not.

Instead, this commit calls NELEMENTS(...->mmaps) to directly
query the bounds of the dereferenced array.

This fixes an array-bounds warning from gcc 4.6 on
vp8_xma_set_mmap.

Change-Id: I918e2721b401d134c1a9764c978912bdb3188be1
parent de5182ee
......@@ -168,7 +168,7 @@ static void *mmap_lkup(vpx_codec_alg_priv_t *ctx, unsigned int id)
{
int i;
for (i = 0; i < NELEMENTS(vp8_mem_req_segs); i++)
for (i = 0; i < NELEMENTS(ctx->mmaps); i++)
if (ctx->mmaps[i].id == id)
return ctx->mmaps[i].base;
......@@ -525,7 +525,7 @@ static vpx_codec_err_t vp8_xma_set_mmap(vpx_codec_ctx_t *ctx,
if (!res && ctx->priv->alg_priv)
{
for (i = 0; i < NELEMENTS(vp8_mem_req_segs); i++)
for (i = 0; i < NELEMENTS(ctx->priv->alg_priv->mmaps); i++)
{
if (ctx->priv->alg_priv->mmaps[i].id == mmap->id)
if (!ctx->priv->alg_priv->mmaps[i].base)
......
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