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While our copy of zlib is missing upstream commit 263b1a05b04e ("Allow
deflatePrime() to insert bits in the middle of a stream.") we do have
Z_FIXED support, and so the majority of the code changes in 5c44459c3b28
("Fix a bug that can crash deflate on some input when using Z_FIXED.")
apply here directly and cleanly. As this has been assigned a CVE, lets
go and apply these changes.
Link: https://github.com/madler/zlib/commit/5c44459c3b28a9bd3283aaceab7c615f8020c531
Reported-by: "Gan, Yau Wai" <[email protected]>
Signed-off-by: Tom Rini <[email protected]>
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