commit 9fd6fbec280ea07326f0d4a0e9289609fafd7ef1 Author: Nick Mathewson nickm@torproject.org Date: Fri Sep 26 09:33:24 2014 -0400

Regenerate pwbox.c with the latest trunnel

This one should no longer generate dead-code warnings with coverity. Fingers crossed? This was CID 1241498 --- src/trunnel/pwbox.c | 47 +++++++++++++++++++++++------------------------ 1 file changed, 23 insertions(+), 24 deletions(-)

diff --git a/src/trunnel/pwbox.c b/src/trunnel/pwbox.c index b70e1d8..bfea3ac 100644 --- a/src/trunnel/pwbox.c +++ b/src/trunnel/pwbox.c @@ -12,6 +12,22 @@ (obj)->trunnel_error_code_ = 1; \ } while (0)

+#if defined(__COVERITY__) || defined(__clang_analyzer__) +/* If we're runnning a static analysis tool, we don't want it to complain + * that some of our remaining-bytes checks are dead-code. */ +int pwbox_deadcode_dummy__ = 0; +#define OR_DEADCODE_DUMMY || pwbox_deadcode_dummy__ +#else +#define OR_DEADCODE_DUMMY +#endif + +#define CHECK_REMAINING(nbytes, label) \ + do { \ + if (remaining < (nbytes) OR_DEADCODE_DUMMY) { \ + goto label; \ + } \ + } while (0) + pwbox_encoded_t * pwbox_encoded_new(void) { @@ -422,49 +438,38 @@ pwbox_encoded_parse_into(pwbox_encoded_t *obj, const uint8_t *input, const size_ (void)result;

/* Parse u32 fixedbytes0 IN [PWBOX0_CONST0] */ - if (remaining < 4) - goto truncated; + CHECK_REMAINING(4, truncated); obj->fixedbytes0 = trunnel_ntohl(trunnel_get_uint32(ptr)); remaining -= 4; ptr += 4; if (! (obj->fixedbytes0 == PWBOX0_CONST0)) goto fail;

/* Parse u32 fixedbytes1 IN [PWBOX0_CONST1] */ - if (remaining < 4) - goto truncated; + CHECK_REMAINING(4, truncated); obj->fixedbytes1 = trunnel_ntohl(trunnel_get_uint32(ptr)); remaining -= 4; ptr += 4; if (! (obj->fixedbytes1 == PWBOX0_CONST1)) goto fail;

/* Parse u8 header_len */ - if (remaining < 1) - goto truncated; + CHECK_REMAINING(1, truncated); obj->header_len = (trunnel_get_uint8(ptr)); remaining -= 1; ptr += 1;

/* Parse u8 skey_header[header_len] */ - if (remaining < obj->header_len) - goto truncated; + CHECK_REMAINING(obj->header_len, truncated); TRUNNEL_DYNARRAY_EXPAND(uint8_t, &obj->skey_header, obj->header_len, {}); obj->skey_header.n_ = obj->header_len; memcpy(obj->skey_header.elts_, ptr, obj->header_len); ptr += obj->header_len; remaining -= obj->header_len;

/* Parse u8 iv[16] */ - if (remaining < (16)) - goto truncated; + CHECK_REMAINING(16, truncated); memcpy(obj->iv, ptr, 16); - { - unsigned idx; - for (idx = 0; idx < 16; ++idx) - obj->iv[idx] = (obj->iv[idx]); - } remaining -= 16; ptr += 16; { size_t remaining_after; - if (remaining < 32) - goto truncated; + CHECK_REMAINING(32, truncated); remaining_after = 32; remaining = remaining - 32;

@@ -479,14 +484,8 @@ pwbox_encoded_parse_into(pwbox_encoded_t *obj, const uint8_t *input, const size_ }

/* Parse u8 hmac[32] */ - if (remaining < (32)) - goto truncated; + CHECK_REMAINING(32, truncated); memcpy(obj->hmac, ptr, 32); - { - unsigned idx; - for (idx = 0; idx < 32; ++idx) - obj->hmac[idx] = (obj->hmac[idx]); - } remaining -= 32; ptr += 32; trunnel_assert(ptr + remaining == input + len_in); return len_in - remaining;