ImageMagick has NULL Pointer Dereference in ClonePixelCacheRepository via crafted image

A NULL pointer dereference in ClonePixelCacheRepository allows a remote attacker to crash any application linked against ImageMagick by supplying a crafted image file, resulting in Denial of Service.

AddressSanitizer:DEADLYSIGNAL
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==3704942==ERROR: AddressSanitizer: UNKNOWN SIGNAL on unknown address 0x000000000000 (pc 0x7f9d141239e0 bp 0x7ffd4c5711e0 sp 0x7ffd4c571148 T0)
    #0 0x7f9d141239e0  (/lib/x86_64-linux-gnu/libc.so.6+0xc49e0)
    #1 0x558a25e4f08d in ClonePixelCacheRepository._omp_fn.0 MagickCore/cache.c:784
    #2 0x7f9d14c06a15 in GOMP_parallel (/lib/x86_64-linux-gnu/libgomp.so.1+0x14a15)
    #3 0x558a25e43151 in ClonePixelCacheRepository MagickCore/cache.c:753
    #4 0x558a25e49a96 in OpenPixelCache MagickCore/cache.c:3849
    #5 0x558a25e45117 in GetImagePixelCache MagickCore/cache.c:1829
    #6 0x558a25e4dde3 in SyncImagePixelCache MagickCore/cache.c:5647
    #7 0x558a256ba57d in SetImageExtent MagickCore/image.c:2713