crypto/x509/x509_vfy.c:852: error: NULL_DEREFERENCE
  pointer `x` last assigned on line 841 could be null and is dereferenced by call to `get_crl_delta()` at line 852, column 18.
Showing all 26 steps of the trace


crypto/x509/x509_vfy.c:834:1: start of procedure check_cert()
832.   }
833.   
834. > static int check_cert(X509_STORE_CTX *ctx)
835.   {
836.       X509_CRL *crl = NULL, *dcrl = NULL;

crypto/x509/x509_vfy.c:836:5: 
834.   static int check_cert(X509_STORE_CTX *ctx)
835.   {
836. >     X509_CRL *crl = NULL, *dcrl = NULL;
837.       X509 *x;
838.       int ok, cnum;

crypto/x509/x509_vfy.c:840:5: 
838.       int ok, cnum;
839.       unsigned int last_reasons;
840. >     cnum = ctx->error_depth;
841.       x = sk_X509_value(ctx->chain, cnum);
842.       ctx->current_cert = x;

crypto/x509/x509_vfy.c:841:9: Condition is true
839.       unsigned int last_reasons;
840.       cnum = ctx->error_depth;
841.       x = sk_X509_value(ctx->chain, cnum);
               ^
842.       ctx->current_cert = x;
843.       ctx->current_issuer = NULL;

crypto/x509/x509_vfy.c:841:5: 
839.       unsigned int last_reasons;
840.       cnum = ctx->error_depth;
841. >     x = sk_X509_value(ctx->chain, cnum);
842.       ctx->current_cert = x;
843.       ctx->current_issuer = NULL;

crypto/stack/stack.c:347:1: start of procedure sk_value()
  345.   }
  346.   
  347. > void *sk_value(const _STACK *st, int i)
  348.   {
  349.       if (!st || (i < 0) || (i >= st->num))

crypto/stack/stack.c:349:10: Taking false branch
  347.   void *sk_value(const _STACK *st, int i)
  348.   {
  349.       if (!st || (i < 0) || (i >= st->num))
                  ^
  350.           return NULL;
  351.       return st->data[i];

crypto/stack/stack.c:349:17: Taking false branch
  347.   void *sk_value(const _STACK *st, int i)
  348.   {
  349.       if (!st || (i < 0) || (i >= st->num))
                         ^
  350.           return NULL;
  351.       return st->data[i];

crypto/stack/stack.c:349:28: Taking true branch
  347.   void *sk_value(const _STACK *st, int i)
  348.   {
  349.       if (!st || (i < 0) || (i >= st->num))
                                    ^
  350.           return NULL;
  351.       return st->data[i];

crypto/stack/stack.c:350:9: 
  348.   {
  349.       if (!st || (i < 0) || (i >= st->num))
  350. >         return NULL;
  351.       return st->data[i];
  352.   }

crypto/stack/stack.c:352:1: return from a call to sk_value
  350.           return NULL;
  351.       return st->data[i];
  352. > }
  353.   
  354.   void *sk_set(_STACK *st, int i, void *value)

crypto/x509/x509_vfy.c:842:5: 
840.       cnum = ctx->error_depth;
841.       x = sk_X509_value(ctx->chain, cnum);
842. >     ctx->current_cert = x;
843.       ctx->current_issuer = NULL;
844.       ctx->current_crl_score = 0;

crypto/x509/x509_vfy.c:843:5: 
841.       x = sk_X509_value(ctx->chain, cnum);
842.       ctx->current_cert = x;
843. >     ctx->current_issuer = NULL;
844.       ctx->current_crl_score = 0;
845.       ctx->current_reasons = 0;

crypto/x509/x509_vfy.c:844:5: 
842.       ctx->current_cert = x;
843.       ctx->current_issuer = NULL;
844. >     ctx->current_crl_score = 0;
845.       ctx->current_reasons = 0;
846.       while (ctx->current_reasons != CRLDP_ALL_REASONS) {

crypto/x509/x509_vfy.c:845:5: 
843.       ctx->current_issuer = NULL;
844.       ctx->current_crl_score = 0;
845. >     ctx->current_reasons = 0;
846.       while (ctx->current_reasons != CRLDP_ALL_REASONS) {
847.           last_reasons = ctx->current_reasons;

crypto/x509/x509_vfy.c:846:12: Loop condition is true. Entering loop body
844.       ctx->current_crl_score = 0;
845.       ctx->current_reasons = 0;
846.       while (ctx->current_reasons != CRLDP_ALL_REASONS) {
                  ^
847.           last_reasons = ctx->current_reasons;
848.           /* Try to retrieve relevant CRL */

crypto/x509/x509_vfy.c:847:9: 
845.       ctx->current_reasons = 0;
846.       while (ctx->current_reasons != CRLDP_ALL_REASONS) {
847. >         last_reasons = ctx->current_reasons;
848.           /* Try to retrieve relevant CRL */
849.           if (ctx->get_crl)

crypto/x509/x509_vfy.c:849:13: Taking false branch
847.           last_reasons = ctx->current_reasons;
848.           /* Try to retrieve relevant CRL */
849.           if (ctx->get_crl)
                   ^
850.               ok = ctx->get_crl(ctx, &crl, x);
851.           else

crypto/x509/x509_vfy.c:852:13: 
850.               ok = ctx->get_crl(ctx, &crl, x);
851.           else
852. >             ok = get_crl_delta(ctx, &crl, &dcrl, x);
853.           /*
854.            * If error looking up CRL, nothing we can do except notify callback

crypto/x509/x509_vfy.c:1401:1: start of procedure get_crl_delta()
  1399.    */
  1400.   
  1401. > static int get_crl_delta(X509_STORE_CTX *ctx,
  1402.                            X509_CRL **pcrl, X509_CRL **pdcrl, X509 *x)
  1403.   {

crypto/x509/x509_vfy.c:1405:5: 
  1403.   {
  1404.       int ok;
  1405. >     X509 *issuer = NULL;
  1406.       int crl_score = 0;
  1407.       unsigned int reasons;

crypto/x509/x509_vfy.c:1406:5: 
  1404.       int ok;
  1405.       X509 *issuer = NULL;
  1406. >     int crl_score = 0;
  1407.       unsigned int reasons;
  1408.       X509_CRL *crl = NULL, *dcrl = NULL;

crypto/x509/x509_vfy.c:1408:5: 
  1406.       int crl_score = 0;
  1407.       unsigned int reasons;
  1408. >     X509_CRL *crl = NULL, *dcrl = NULL;
  1409.       STACK_OF(X509_CRL) *skcrl;
  1410.       X509_NAME *nm = X509_get_issuer_name(x);

crypto/x509/x509_vfy.c:1410:5: 
  1408.       X509_CRL *crl = NULL, *dcrl = NULL;
  1409.       STACK_OF(X509_CRL) *skcrl;
  1410. >     X509_NAME *nm = X509_get_issuer_name(x);
  1411.       reasons = ctx->current_reasons;
  1412.       ok = get_crl_sk(ctx, &crl, &dcrl,

crypto/x509/x509_cmp.c:132:1: start of procedure X509_get_issuer_name()
    130.   #endif
    131.   
    132. > X509_NAME *X509_get_issuer_name(X509 *a)
    133.   {
    134.       return (a->cert_info->issuer);

crypto/x509/x509_cmp.c:134:5: 
    132.   X509_NAME *X509_get_issuer_name(X509 *a)
    133.   {
    134. >     return (a->cert_info->issuer);
    135.   }
    136.   

static int check_cert(X509_STORE_CTX *ctx)
{
    X509_CRL *crl = NULL, *dcrl = NULL;
    X509 *x;
    int ok, cnum;
    unsigned int last_reasons;
    cnum = ctx->error_depth;
    x = sk_X509_value(ctx->chain, cnum);
    ctx->current_cert = x;
    ctx->current_issuer = NULL;
    ctx->current_crl_score = 0;
    ctx->current_reasons = 0;
    while (ctx->current_reasons != CRLDP_ALL_REASONS) {
        last_reasons = ctx->current_reasons;
        if (ctx->get_crl)
            ok = ctx->get_crl(ctx, &crl, x);
        else
            ok = get_crl_delta(ctx, &crl, &dcrl, x);
        if (!ok) {
            ctx->error = X509_V_ERR_UNABLE_TO_GET_CRL;
            ok = ctx->verify_cb(0, ctx);
            goto err;
        }
        ctx->current_crl = crl;
        ok = ctx->check_crl(ctx, crl);
        if (!ok)
            goto err;
        if (dcrl) {
            ok = ctx->check_crl(ctx, dcrl);
            if (!ok)
                goto err;
            ok = ctx->cert_crl(ctx, dcrl, x);
            if (!ok)
                goto err;
        } else
            ok = 1;
        if (ok != 2) {
            ok = ctx->cert_crl(ctx, crl, x);
            if (!ok)
                goto err;
        }
        X509_CRL_free(crl);
        X509_CRL_free(dcrl);
        crl = NULL;
        dcrl = NULL;
        if (last_reasons == ctx->current_reasons) {
            ctx->error = X509_V_ERR_UNABLE_TO_GET_CRL;
            ok = ctx->verify_cb(0, ctx);
            goto err;
        }
    }
 err:
    X509_CRL_free(crl);
    X509_CRL_free(dcrl);
    ctx->current_crl = NULL;
    return ok;
}
['static int check_cert(X509_STORE_CTX *ctx)\n{\n    X509_CRL *crl = NULL, *dcrl = NULL;\n    X509 *x;\n    int ok, cnum;\n    unsigned int last_reasons;\n    cnum = ctx->error_depth;\n    x = sk_X509_value(ctx->chain, cnum);\n    ctx->current_cert = x;\n    ctx->current_issuer = NULL;\n    ctx->current_crl_score = 0;\n    ctx->current_reasons = 0;\n    while (ctx->current_reasons != CRLDP_ALL_REASONS) {\n        last_reasons = ctx->current_reasons;\n        if (ctx->get_crl)\n            ok = ctx->get_crl(ctx, &crl, x);\n        else\n            ok = get_crl_delta(ctx, &crl, &dcrl, x);\n        if (!ok) {\n            ctx->error = X509_V_ERR_UNABLE_TO_GET_CRL;\n            ok = ctx->verify_cb(0, ctx);\n            goto err;\n        }\n        ctx->current_crl = crl;\n        ok = ctx->check_crl(ctx, crl);\n        if (!ok)\n            goto err;\n        if (dcrl) {\n            ok = ctx->check_crl(ctx, dcrl);\n            if (!ok)\n                goto err;\n            ok = ctx->cert_crl(ctx, dcrl, x);\n            if (!ok)\n                goto err;\n        } else\n            ok = 1;\n        if (ok != 2) {\n            ok = ctx->cert_crl(ctx, crl, x);\n            if (!ok)\n                goto err;\n        }\n        X509_CRL_free(crl);\n        X509_CRL_free(dcrl);\n        crl = NULL;\n        dcrl = NULL;\n        if (last_reasons == ctx->current_reasons) {\n            ctx->error = X509_V_ERR_UNABLE_TO_GET_CRL;\n            ok = ctx->verify_cb(0, ctx);\n            goto err;\n        }\n    }\n err:\n    X509_CRL_free(crl);\n    X509_CRL_free(dcrl);\n    ctx->current_crl = NULL;\n    return ok;\n}', 'void *sk_value(const _STACK *st, int i)\n{\n    if (!st || (i < 0) || (i >= st->num))\n        return NULL;\n    return st->data[i];\n}', 'static int get_crl_delta(X509_STORE_CTX *ctx,\n                         X509_CRL **pcrl, X509_CRL **pdcrl, X509 *x)\n{\n    int ok;\n    X509 *issuer = NULL;\n    int crl_score = 0;\n    unsigned int reasons;\n    X509_CRL *crl = NULL, *dcrl = NULL;\n    STACK_OF(X509_CRL) *skcrl;\n    X509_NAME *nm = X509_get_issuer_name(x);\n    reasons = ctx->current_reasons;\n    ok = get_crl_sk(ctx, &crl, &dcrl,\n                    &issuer, &crl_score, &reasons, ctx->crls);\n    if (ok)\n        goto done;\n    skcrl = ctx->lookup_crls(ctx, nm);\n    if (!skcrl && crl)\n        goto done;\n    get_crl_sk(ctx, &crl, &dcrl, &issuer, &crl_score, &reasons, skcrl);\n    sk_X509_CRL_pop_free(skcrl, X509_CRL_free);\n done:\n    if (crl) {\n        ctx->current_issuer = issuer;\n        ctx->current_crl_score = crl_score;\n        ctx->current_reasons = reasons;\n        *pcrl = crl;\n        *pdcrl = dcrl;\n        return 1;\n    }\n    return 0;\n}', 'X509_NAME *X509_get_issuer_name(X509 *a)\n{\n    return (a->cert_info->issuer);\n}']