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Fix FreeMipmapColormap crash

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This commit is contained in:
Jaime Passos 2019-11-24 17:37:11 -03:00
parent 23643e05c0
commit c9ff8ec26b
1 changed files with 15 additions and 8 deletions
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23
src/hardware/hw_cache.c
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@ -771,18 +771,25 @@ void HWR_InitTextureCache(void)
gr_textures2 = NULL;
}
// Callback function for HWR_FreeTextureCache.
static void FreeMipmapColormap(INT32 patchnum, void *patch)
{
GLPatch_t* const grpatch = patch;
GLPatch_t* const pat = patch;
(void)patchnum; //unused
while (grpatch->mipmap->nextcolormap)
while (pat->mipmap && pat->mipmap->nextcolormap) // The mipmap must be valid, obviously
{
GLMipmap_t *grmip = grpatch->mipmap->nextcolormap;
grpatch->mipmap->nextcolormap = grmip->nextcolormap;
if (grmip->grInfo.data) Z_Free(grmip->grInfo.data);
free(grmip);
// Confusing at first, but pat->mipmap->nextcolormap
// at the beginning of the loop is the first colormap
// from the linked list of colormaps
GLMipmap_t *next = pat->mipmap->nextcolormap;
// Set the first colormap
// to the one that comes after it
pat->mipmap->nextcolormap = next->nextcolormap;
// Free image data from memory
if (next->grInfo.data)
Z_Free(next->grInfo.data);
// Free the old colormap from memory
free(next);
}
}
@ -799,7 +806,7 @@ void HWR_FreeTextureCache(void)
// Alam: free the Z_Blocks before freeing it's users
// free all skin after each level: must be done after pfnClearMipMapCache!
// free all patch colormaps after each level: must be done after ClearMipMapCache!
for (i = 0; i < numwadfiles; i++)
M_AATreeIterate(wadfiles[i]->hwrcache, FreeMipmapColormap);