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strbuf_attach(sb, buf, len, alloc) requires alloc > len (the buffer must have at least len+1 bytes to hold the NUL). Several call sites passed alloc == len, relying on strbuf_grow(sb, 0) inside strbuf_attach to reallocate. Fix these in mailinfo, am, refs/files-backend, fast-import, and trailer by passing len+1 when the buffer is a NUL-terminated string (or from strbuf_detach). Signed-off-by: Vaidas Pilkauskas <vaidas.pilkauskas@shopify.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>