Xiaosatianyu

A heap-based buffer overflow occurs in the `LZWDecodeCompat` function in `tif lzw.c` via a crafted TIFF file. This issue can be exploited by a remote attacker to cause a denial of service using a specially crafted TIFF file.

The issue is related to a heap-based buffer over-read in the `PackBitsEncode` function located in `tif packbits.c`.