[Pillow] Out of bounds read in Pillow

An issue was discovered in Pillow before 8.1.1. In TiffDecode.c, there is an out-of-bounds read in TiffreadRGBATile via invalid tile boundaries.

References

• https://nvd.nist.gov/vuln/detail/CVE-2021-25291
• https://github.com/python-pillow/Pillow/commit/cbdce6c5d054fccaf4af34b47f212355c64ace7a
• https://pillow.readthedocs.io/en/stable/releasenotes/8.1.1.html
• https://security.gentoo.org/glsa/202107-33
• https://github.com/advisories/GHSA-mvg9-xffr-p774