Fix crash with crafted ini files.
If the key or value is bigger than 1024 we will end up in a buffer
overflow. The overflow is caught by _FORTIFY_SOURCE, so it's definitely
DoS-only. Curiously, because of ample space in the stack frame, it does
not result in a crash without _FORTIFY_SOURCE in all cases.
Signed-off-by: NAndreas Schneider <asn@samba.org>
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