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1086-inet_res-fix-label-compression-encoder-for...
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File 1086-inet_res-fix-label-compression-encoder-for-large-res.patch of Package erlang
From fc48515df428c27cc0efe5bc2d1956099139d04b Mon Sep 17 00:00:00 2001 From: Alexander Clouter <alex@digriz.org.uk> Date: Tue, 5 Jan 2021 13:24:24 +0000 Subject: [PATCH 1/2] inet_res: fix label compression encoder for large responses The pointer in the label is only 14bit wide and a typo incorrectly uses the 0b11 (3) flag meaning the limit of 49152 is used instead of 16384. --- lib/kernel/src/inet_dns.erl | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/lib/kernel/src/inet_dns.erl b/lib/kernel/src/inet_dns.erl index e03f124fe6..18103771dc 100644 --- a/lib/kernel/src/inet_dns.erl +++ b/lib/kernel/src/inet_dns.erl @@ -697,7 +697,7 @@ encode_labels(Bin, Comp0, Pos, [L|Ls]=Labels) when 1 =< byte_size(L), byte_size(L) =< 63 -> case gb_trees:lookup(Labels, Comp0) of none -> - Comp = if Pos < (3 bsl 14) -> + Comp = if Pos < (1 bsl 14) -> %% Just in case - compression %% pointers can not reach further gb_trees:insert(Labels, Pos, Comp0); -- 2.26.2
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