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Enable MSVC warning C4701, use of potentially uninitialized variable.

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C4701 is "potentially uninitialized local variable 'buf' used". It
sometimes results in false positives, which can now be suppressed
using the macro OPENSSL_SUPPRESS_POTENTIALLY_UNINITIALIZED_WARNINGS.

Change-Id: I15068b5a48e1c704702e7752982b9ead855e7633
Reviewed-on: https://boringssl-review.googlesource.com/3160
Reviewed-by: Adam Langley <agl@google.com>
This commit is contained in:
Brian Smith 2015-01-29 15:03:18 -08:00 committed by Adam Langley
parent 1a9bc44127
commit a039d70270
9 changed files with 75 additions and 45 deletions
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1
CMakeLists.txt
View File

@ -45,7 +45,6 @@ elseif(MSVC)
# copy constructor is inaccessible or deleted
"C4626" # assignment operator could not be generated because a base class
# assignment operator is inaccessible or deleted
"C4701" # potentially uninitialized local variable 'mdlen' used
"C4706" # assignment within conditional expression
"C4710" # 'function': function not inlined
"C4711" # function 'function' selected for inline expansion

3
crypto/asn1/tasn_dec.c
View File

@ -63,6 +63,8 @@
#include <openssl/err.h>
#include <openssl/mem.h>
#include "../internal.h"
static int asn1_check_eoc(const unsigned char **in, long len);
static int asn1_find_end(const unsigned char **in, long len, char inf);
@ -762,6 +764,7 @@ static int asn1_d2i_ex_primitive(ASN1_VALUE **pval,
const unsigned char **in, long inlen,
const ASN1_ITEM *it,
int tag, int aclass, char opt, ASN1_TLC *ctx)
OPENSSL_SUPPRESS_POTENTIALLY_UNINITIALIZED_WARNINGS
{
int ret = 0, utype;
long plen;

16
crypto/evp/digestsign.c
View File

@ -162,12 +162,12 @@ int EVP_DigestSignFinal(EVP_MD_CTX *ctx, uint8_t *out_sig,
r = tmp_ctx.pctx->pmeth->signctx(tmp_ctx.pctx, out_sig, out_sig_len, &tmp_ctx);
} else {
r = EVP_DigestFinal_ex(&tmp_ctx, md, &mdlen);
if (r) {
r = EVP_PKEY_sign(ctx->pctx, out_sig, out_sig_len, md, mdlen);
}
}
EVP_MD_CTX_cleanup(&tmp_ctx);
if (has_signctx || !r) {
return r;
}
return EVP_PKEY_sign(ctx->pctx, out_sig, out_sig_len, md, mdlen);
} else {
if (has_signctx) {
return ctx->pctx->pmeth->signctx(ctx->pctx, out_sig, out_sig_len, ctx);
@ -184,21 +184,21 @@ int EVP_DigestVerifyFinal(EVP_MD_CTX *ctx, const uint8_t *sig,
uint8_t md[EVP_MAX_MD_SIZE];
int r;
unsigned int mdlen;
const int has_verifyctx = ctx->pctx->pmeth->verifyctx != NULL;
EVP_MD_CTX_init(&tmp_ctx);
if (!EVP_MD_CTX_copy_ex(&tmp_ctx, ctx)) {
return 0;
}
if (has_verifyctx) {
if (ctx->pctx->pmeth->verifyctx) {
r = tmp_ctx.pctx->pmeth->verifyctx(tmp_ctx.pctx, sig, sig_len, &tmp_ctx);
} else {
r = EVP_DigestFinal_ex(&tmp_ctx, md, &mdlen);
if (r) {
r = EVP_PKEY_verify(ctx->pctx, sig, sig_len, md, mdlen);
}
}
EVP_MD_CTX_cleanup(&tmp_ctx);
if (has_verifyctx || !r) {
return r;
}
return EVP_PKEY_verify(ctx->pctx, sig, sig_len, md, mdlen);
}

21
crypto/internal.h
View File

@ -120,6 +120,27 @@ extern "C" {
#endif
/* MSVC's C4701 warning about the use of *potentially*--as opposed to
* *definitely*--uninitialized values sometimes has false positives. Usually
* the false positives can and should be worked around by simplifying the
* control flow. When that is not practical, annotate the function containing
* the code that triggers the warning with
* OPENSSL_SUPPRESS_POTENTIALLY_UNINITIALIZED_WARNINGS after its parameters:
*
* void f() OPENSSL_SUPPRESS_POTENTIALLY_UNINITIALIZED_WARNINGS {
* ...
* }
*
* Note that MSVC's control flow analysis seems to operate on a whole-function
* basis, so the annotation must be placed on the entire function, not just a
* block within the function. */
#if defined(_MSC_VER)
#define OPENSSL_SUPPRESS_POTENTIALLY_UNINITIALIZED_WARNINGS \
__pragma(warning(suppress:4701))
#else
#define OPENSSL_SUPPRESS_POTENTIALLY_UNINITIALIZED_WARNINGS
#endif
/* MSVC will sometimes correctly detect unreachable code and issue a warning,
* which breaks the build since we treat errors as warnings, in some rare cases
* where we want to allow the dead code to continue to exist. In these

3
crypto/pem/pem_lib.c
View File

@ -363,10 +363,11 @@ int PEM_ASN1_write_bio(i2d_of_void *i2d, const char *name, BIO *bp,
|| !EVP_EncryptUpdate(&ctx,data,&j,data,i)
|| !EVP_EncryptFinal_ex(&ctx,&(data[j]),&i))
ret = 0;
else
i += j;
EVP_CIPHER_CTX_cleanup(&ctx);
if (ret == 0)
goto err;
i+=j;
}
else
{

23
crypto/rsa/rsa.c
View File

@ -361,10 +361,6 @@ static int pkcs1_prefixed_msg(uint8_t **out_msg, size_t *out_msg_len,
int *is_alloced, int hash_nid, const uint8_t *msg,
size_t msg_len) {
unsigned i;
const uint8_t* prefix = NULL;
unsigned prefix_len;
uint8_t *signed_msg;
unsigned signed_msg_len;
if (hash_nid == NID_md5_sha1) {
/* Special case: SSL signature, just check the length. */
@ -381,17 +377,14 @@ static int pkcs1_prefixed_msg(uint8_t **out_msg, size_t *out_msg_len,
for (i = 0; kPKCS1SigPrefixes[i].nid != NID_undef; i++) {
const struct pkcs1_sig_prefix *sig_prefix = &kPKCS1SigPrefixes[i];
if (sig_prefix->nid == hash_nid) {
prefix = sig_prefix->bytes;
prefix_len = sig_prefix->len;
break;
}
if (sig_prefix->nid != hash_nid) {
continue;
}
if (prefix == NULL) {
OPENSSL_PUT_ERROR(RSA, pkcs1_prefixed_msg, RSA_R_UNKNOWN_ALGORITHM_TYPE);
return 0;
}
const uint8_t* prefix = sig_prefix->bytes;
unsigned prefix_len = sig_prefix->len;
unsigned signed_msg_len;
uint8_t *signed_msg;
signed_msg_len = prefix_len + msg_len;
if (signed_msg_len < prefix_len) {
@ -415,6 +408,10 @@ static int pkcs1_prefixed_msg(uint8_t **out_msg, size_t *out_msg_len,
return 1;
}
OPENSSL_PUT_ERROR(RSA, pkcs1_prefixed_msg, RSA_R_UNKNOWN_ALGORITHM_TYPE);
return 0;
}
int RSA_sign(int hash_nid, const uint8_t *in, unsigned in_len, uint8_t *out,
unsigned *out_len, RSA *rsa) {
const unsigned rsa_size = RSA_size(rsa);

3
crypto/x509/asn1_gen.c
View File

@ -64,6 +64,8 @@
#include <openssl/obj.h>
#include <openssl/x509v3.h>
#include "../internal.h"
/* Although this file is in crypto/x509 for layering purposes, it emits errors
* from the ASN.1 module for OpenSSL compatibility. */
@ -141,6 +143,7 @@ ASN1_TYPE *ASN1_generate_nconf(char *str, CONF *nconf)
}
ASN1_TYPE *ASN1_generate_v3(char *str, X509V3_CTX *cnf)
OPENSSL_SUPPRESS_POTENTIALLY_UNINITIALIZED_WARNINGS
{
ASN1_TYPE *ret;
tag_exp_arg asn1_tags;

3
crypto/x509/x509_vfy.c
View File

@ -68,6 +68,8 @@
#include <openssl/x509v3.h>
#include "vpm_int.h"
#include "../internal.h"
/* CRL score values */
@ -813,6 +815,7 @@ static int check_revocation(X509_STORE_CTX *ctx)
}
static int check_cert(X509_STORE_CTX *ctx)
OPENSSL_SUPPRESS_POTENTIALLY_UNINITIALIZED_WARNINGS
{
X509_CRL *crl = NULL, *dcrl = NULL;
X509 *x;

3
crypto/x509v3/v3_conf.c
View File

@ -67,6 +67,8 @@
#include <openssl/x509.h>
#include <openssl/x509v3.h>
#include "../internal.h"
static int v3_check_critical(char **value);
static int v3_check_generic(char **value);
@ -260,6 +262,7 @@ static int v3_check_generic(char **value)
static X509_EXTENSION *v3_generic_extension(const char *ext, char *value,
int crit, int gen_type,
X509V3_CTX *ctx)
OPENSSL_SUPPRESS_POTENTIALLY_UNINITIALIZED_WARNINGS
{
unsigned char *ext_der=NULL;
long ext_len;