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fuzz: allow bech32_encode to succeed

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We were passing a max_output_len that was too small, so every call to
bech32_encode was failing. Now we set max_output_len to the full size of
bech32_str.
This commit is contained in:
Matt Morehouse 2023-05-05 16:11:53 -05:00 • committed by Rusty Russell
parent 513bd29330
commit 255413377b
1 changed files with 7 additions and 6 deletions
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13
tests/fuzz/fuzz-bech32.c
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@ -15,7 +15,7 @@ void run(const uint8_t *data, size_t size)
const char hrp_inv[5] = "lnbc\0", hrp_addr[3] = "bc\0";
char *bech32_str, *hrp_out, *addr;
uint8_t *data_out;
size_t data_out_len;
size_t data_out_len, bech32_str_cap;
int wit_version;
bech32_encoding benc;
@ -23,14 +23,15 @@ void run(const uint8_t *data, size_t size)
return;
/* Buffer size is defined in each function's doc comment. */
bech32_str = malloc(size + strlen(hrp_inv) + 8);
benc = data[0] ? BECH32_ENCODING_BECH32 : BECH32_ENCODING_BECH32M;
/* FIXME: needs a dictionary / a startup seed corpus to pass this more
* frequently. */
if (bech32_encode(bech32_str, hrp_inv, data+1, size-1, size-1, benc) == 1) {
bech32_str_cap = (size - 1) + strlen(hrp_inv) + 8;
bech32_str = malloc(bech32_str_cap);
if (bech32_encode(bech32_str, hrp_inv, data + 1, size - 1,
bech32_str_cap, benc) == 1) {
hrp_out = malloc(strlen(bech32_str) - 6);
data_out = malloc(strlen(bech32_str) - 8);
assert(bech32_decode(hrp_out, data_out, &data_out_len, bech32_str, size) == benc);
assert(bech32_decode(hrp_out, data_out, &data_out_len,
bech32_str, bech32_str_cap) == benc);
free(hrp_out);
free(data_out);
}