From a1898b699d4664ec0326dcd5f7b505ab8fa4983d Mon Sep 17 00:00:00 2001
From: Rusty Russell <rusty@rustcorp.com.au>
Date: Wed, 31 Oct 2018 11:43:49 +1030
Subject: [PATCH] bech32: fix overflow bug.

Copied from upstream:

 https://github.com/sipa/bech32/commit/2b0aac650ce560fb2b2a2bebeacaa5c87d7e5938

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
---
 common/bech32.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/common/bech32.c b/common/bech32.c
index d689b1fb9..cc62abdc0 100644
--- a/common/bech32.c
+++ b/common/bech32.c
@@ -99,7 +99,7 @@ int bech32_decode(char* hrp, uint8_t *data, size_t *data_len, const char *input,
         ++(*data_len);
     }
     hrp_len = input_len - (1 + *data_len);
-    if (hrp_len < 1 || *data_len < 6) {
+    if (1 + *data_len >= input_len || *data_len < 6) {
         return 0;
     }
     *(data_len) -= 6;