jp3d/jpwl convert: fix write stack buffer overflow #1160
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Missing buffer length formatter in fscanf call might lead to write stack buffer overflow. fixes uclouvain#1044 (CVE-2017-17480)
Tile components in a JP2 image might have null data pointer by defining a zero component size (for example using large horizontal or vertical sampling periods). This null data pointer leads to null image component data pointer, causing crash when dereferenced without != null check in imagetopnm. Add != null check. This commit addresses uclouvain#1152 (CVE-2018-18088).
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FTR, I have added a second fix addressing #1152. A few comments:
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Missing buffer length formatter in fscanf call might lead to write stack buffer overflow.
(same patch as e528531)
Fixes #1044 (CVE-2017-17480).