A crafted input file could cause a null pointer dereference in jcopy_sample_rows() when processed by libjpeg-turbo.
https://github.com/libjpeg-turbo/libjpeg-turbo/issues/441
https://github.com/libjpeg-turbo/libjpeg-turbo/commit/9120a247436e84c0b4eea828cb11e8f665fcde30