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https://github.com/ImageMagick/ImageMagick/security/advisories/GHSA-cjc8-g9w8-chfw

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Cristy
2025-08-07 19:14:00 -04:00
parent f86cbbd7c9
commit 55d97055e0
1 changed files with 10 additions and 23 deletions
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coders/png.c
+10 -23
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@@ -4791,37 +4791,24 @@ static Image *ReadOneJNGImage(MngReadInfo *mng_info,
jng_image=ReadImage(alpha_image_info,exception);
if (jng_image != (Image *) NULL)
for (y=0; y < (ssize_t) image->rows; y++)
{
s=GetVirtualPixels(jng_image,0,y,image->columns,1,exception);
q=GetAuthenticPixels(image,0,y,image->columns,1,exception);
if ((s == (const Quantum *) NULL) || (q == (Quantum *) NULL))
break;
image->alpha_trait=BlendPixelTrait;
for (y=0; y < (ssize_t) image->rows; y++)
{
s=GetVirtualPixels(jng_image,0,y,image->columns,1,exception);
q=GetAuthenticPixels(image,0,y,image->columns,1,exception);
if ((s == (const Quantum *) NULL) || (q == (Quantum *) NULL))
break;
if (image->alpha_trait != UndefinedPixelTrait)
for (x=(ssize_t) image->columns; x != 0; x--)
{
SetPixelAlpha(image,GetPixelRed(jng_image,s),q);
q+=(ptrdiff_t) GetPixelChannels(image);
s+=(ptrdiff_t) GetPixelChannels(jng_image);
}
else
for (x=(ssize_t) image->columns; x != 0; x--)
{
Quantum
alpha;
alpha=GetPixelRed(jng_image,s);
SetPixelAlpha(image,alpha,q);
if (alpha != OpaqueAlpha)
image->alpha_trait=BlendPixelTrait;
q+=(ptrdiff_t) GetPixelChannels(image);
s+=(ptrdiff_t) GetPixelChannels(jng_image);
}
if (SyncAuthenticPixels(image,exception) == MagickFalse)
break;
if (SyncAuthenticPixels(image,exception) == MagickFalse)
break;
}
}
(void) RelinquishUniqueFileResource(alpha_image->filename);
alpha_image=DestroyImageList(alpha_image);