[Bug libc/13138] scanf crashes on very long numbers

[fweimer at redhat dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=13138

--- Comment #8 from Florian Weimer <fweimer at redhat dot com> ---
(In reply to Andreas Schwab from comment #7)
> Follow-up fix: https://sourceware.org/git/?p=glibc.git;a=commitdiff;h=20b38e0

I think this is just a performance fix because the buffer is populated by one
character at a time, so __libc_use_alloca is always true on the first buffer
extension, and then we are in the use_malloc case.

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