commit 6dc90d290daa29b4ff2c7692be3a2ed64f25dfc1 Author: Nick Mathewson nickm@torproject.org Date: Fri Dec 14 13:11:58 2018 -0500

Use 25% less RAM for base64-encoded directory objects

We were allocating N bytes to decode an N-byte base64 encoding, when 3N/4 would have been enough. --- src/feature/dirparse/parsecommon.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/src/feature/dirparse/parsecommon.c b/src/feature/dirparse/parsecommon.c index e00af0eea..91b775533 100644 --- a/src/feature/dirparse/parsecommon.c +++ b/src/feature/dirparse/parsecommon.c @@ -393,8 +393,9 @@ get_next_token(memarea_t *area, RET_ERR("Couldn't parse private key."); } else { /* If it's something else, try to base64-decode it */ int r; - tok->object_body = ALLOC(next-*s); /* really, this is too much RAM. */ - r = base64_decode(tok->object_body, next-*s, *s, next-*s); + size_t maxsize = base64_decode_maxsize(next-*s); + tok->object_body = ALLOC(maxsize); + r = base64_decode(tok->object_body, maxsize, *s, next-*s); if (r<0) RET_ERR("Malformed object: bad base64-encoded data"); tok->object_size = r;