ImageMagick: Heap overflow in sun decoder on 32-bit systems may result in out of bounds write

An Integer Overflow vulnerability exists in the sun decoder. On 32-bit systems/builds, a carefully crafted image can lead to an out of bounds heap write.

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==1967675==ERROR: AddressSanitizer: heap-buffer-overflow on address 0xf190b50e at pc 0x5eae8777 bp 0xffb0fdd8 sp 0xffb0fdd0
WRITE of size 1 at 0xf190b50e thread T0