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hs: Silence a spurious warning in rend_client_send_introduction()

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gcc 8 warns that extend_info_t.nickname might be truncated by strncpy().

But it doesn't know that nickname can either contain a hex id, or a
nicknames. hex ids are only used for general and HSDir circuits.

Fixes bug 27463; bugfix on 0.1.1.2-alpha.
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teor 2018-09-05 21:07:58 +10:00
parent ff1486385a
commit 9d5c6317b5
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changes/bug27463 Normal file
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@ -0,0 +1,3 @@
o Minor bugfixes (onion services):
- Silence a spurious compiler warning in rend_client_send_introduction().
Fixes bug 27463; bugfix on 0.1.1.2-alpha.

9
src/or/rendclient.c
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@ -269,6 +269,15 @@ rend_client_send_introduction(origin_circuit_t *introcirc,
dh_offset = v3_shift+7+DIGEST_LEN+2+klen+REND_COOKIE_LEN;
} else {
/* Version 0. */
/* Some compilers are smart enough to work out that nickname can be more
* than 19 characters, when it's a hexdigest. They warn that strncpy()
* will truncate hexdigests without NUL-terminating them. But we only put
* hexdigests in HSDir and general circuit exits. */
if (BUG(strlen(rendcirc->build_state->chosen_exit->nickname)
> MAX_NICKNAME_LEN)) {
goto perm_err;
}
strncpy(tmp, rendcirc->build_state->chosen_exit->nickname,
(MAX_NICKNAME_LEN+1)); /* nul pads */
memcpy(tmp+MAX_NICKNAME_LEN+1, rendcirc->rend_data->rend_cookie,