CVE-2020-13113: Ensure the MakerNote data pointers are initialized with NULL. · libexif/libexif@ec412aa

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Ensure the MakerNote data pointers are initialized with NULL.

This ensures that an uninitialized pointer isn’t dereferenced later in the case where the number of components (and therefore size) is 0.

This fixes the second issue reported at https://sourceforge.net/p/libexif/bugs/125/

CVE-2020-13113

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1. +1 −0 libexif/canon/exif-mnote-data-canon.c
2. +1 −0 libexif/fuji/exif-mnote-data-fuji.c
3. +1 −0 libexif/olympus/exif-mnote-data-olympus.c
4. +1 −0 libexif/pentax/exif-mnote-data-pentax.c