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Fix FreeMipmapColormap Crash

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Backport from SRB2
See: e9e0683d5e

Credits go to Lactozilla
This commit is contained in:
alufolie91 2023-08-15 03:28:37 +02:00 committed by Alug
parent 62294dfe35
commit 4df9749570
1 changed files with 32 additions and 7 deletions
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39
src/hardware/hw_cache.c
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@ -479,14 +479,39 @@ void HWR_InitTextureCache(void)
// 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)
// The patch must be valid, obviously
if (!pat)
return;
// The mipmap must be valid, obviously
while (pat->mipmap)
{
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 = NULL;
// No mipmap in this patch, break out of the loop.
if (!pat->mipmap)
break;
// No colormap mipmap either.
if (!pat->mipmap->nextcolormap)
break;
// Set the first colormap to the one that comes after it.
next = pat->mipmap->nextcolormap;
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);
}
}
@ -503,7 +528,7 @@ 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);