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This fixes the CVE-2016-9840. Commit imported from [1].
inftrees.c was subtracting an offset from a pointer to an array,
in order to provide a pointer that allowed indexing starting at
the offset. This is not compliant with the C standard, for which
the behavior of a pointer decremented before its allocated memory
is undefined. Per the recommendation of a security audit of the
zlib code by Trail of Bits and TrustInSoft, in support of the
Mozilla Foundation, this tiny optimization was removed, in order
to avoid the possibility of undefined behavior.
[1]:
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|---|---|---|
| .. | ||
| adler32.c | ||
| deflate.c | ||
| deflate.h | ||
| inffast.c | ||
| inffast.h | ||
| inffixed.h | ||
| inflate.c | ||
| inflate.h | ||
| inftrees.c | ||
| inftrees.h | ||
| Makefile | ||
| trees.c | ||
| trees.h | ||
| zlib.c | ||
| zlib.h | ||
| zutil.c | ||
| zutil.h | ||