crypto/srp/srp_lib.c:82: error: NULL_DEREFERENCE
  pointer `bn_ctx` last assigned on line 66 could be null and is dereferenced by call to `BN_CTX_free()` at line 82, column 5.
Showing all 25 steps of the trace


crypto/srp/srp_lib.c:57:1: start of procedure SRP_Calc_server_key()
55.   }
56.   
57. > BIGNUM *SRP_Calc_server_key(const BIGNUM *A, const BIGNUM *v, const BIGNUM *u,
58.                               const BIGNUM *b, const BIGNUM *N)
59.   {

crypto/srp/srp_lib.c:60:5: 
58.                               const BIGNUM *b, const BIGNUM *N)
59.   {
60. >     BIGNUM *tmp = NULL, *S = NULL;
61.       BN_CTX *bn_ctx;
62.   

crypto/srp/srp_lib.c:63:9: Taking false branch
61.       BN_CTX *bn_ctx;
62.   
63.       if (u == NULL || A == NULL || v == NULL || b == NULL || N == NULL)
              ^
64.           return NULL;
65.   

crypto/srp/srp_lib.c:63:22: Taking false branch
61.       BN_CTX *bn_ctx;
62.   
63.       if (u == NULL || A == NULL || v == NULL || b == NULL || N == NULL)
                           ^
64.           return NULL;
65.   

crypto/srp/srp_lib.c:63:35: Taking false branch
61.       BN_CTX *bn_ctx;
62.   
63.       if (u == NULL || A == NULL || v == NULL || b == NULL || N == NULL)
                                        ^
64.           return NULL;
65.   

crypto/srp/srp_lib.c:63:48: Taking false branch
61.       BN_CTX *bn_ctx;
62.   
63.       if (u == NULL || A == NULL || v == NULL || b == NULL || N == NULL)
                                                     ^
64.           return NULL;
65.   

crypto/srp/srp_lib.c:63:61: Taking false branch
61.       BN_CTX *bn_ctx;
62.   
63.       if (u == NULL || A == NULL || v == NULL || b == NULL || N == NULL)
                                                                  ^
64.           return NULL;
65.   

crypto/srp/srp_lib.c:66:9: Taking true branch
64.           return NULL;
65.   
66.       if ((bn_ctx = BN_CTX_new()) == NULL || (tmp = BN_new()) == NULL)
              ^
67.           goto err;
68.   

crypto/srp/srp_lib.c:81:2: 
79.           S = NULL;
80.       }
81. >  err:
82.       BN_CTX_free(bn_ctx);
83.       BN_clear_free(tmp);

crypto/srp/srp_lib.c:82:5: 
80.       }
81.    err:
82. >     BN_CTX_free(bn_ctx);
83.       BN_clear_free(tmp);
84.       return S;

crypto/bn/bn_ctx.c:157:1: start of procedure BN_CTX_free()
  155.   }
  156.   
  157. > void BN_CTX_free(BN_CTX *ctx)
  158.   {
  159.   #ifdef BN_CTX_DEBUG

crypto/bn/bn_ctx.c:174:5: 
  172.       }
  173.   #endif
  174. >     BN_STACK_finish(&ctx->stack);
  175.       BN_POOL_finish(&ctx->pool);
  176.       OPENSSL_free(ctx);

crypto/bn/bn_ctx.c:243:1: start of procedure BN_STACK_finish()
    241.   }
    242.   
    243. > static void BN_STACK_finish(BN_STACK *st)
    244.   {
    245.       OPENSSL_free(st->indexes);

crypto/bn/bn_ctx.c:245:5: 
    243.   static void BN_STACK_finish(BN_STACK *st)
    244.   {
    245. >     OPENSSL_free(st->indexes);
    246.       st->indexes = NULL;
    247.   }

crypto/mem.c:295:1: start of procedure CRYPTO_free()
      293.   }
      294.   
      295. > void CRYPTO_free(void *str, const char *file, int line)
      296.   {
      297.       INCREMENT(free_count);

crypto/mem.c:298:9: Taking true branch
      296.   {
      297.       INCREMENT(free_count);
      298.       if (free_impl != NULL && free_impl != &CRYPTO_free) {
                     ^
      299.           free_impl(str, file, line);
      300.           return;

crypto/mem.c:298:30: Taking true branch
      296.   {
      297.       INCREMENT(free_count);
      298.       if (free_impl != NULL && free_impl != &CRYPTO_free) {
                                          ^
      299.           free_impl(str, file, line);
      300.           return;

crypto/mem.c:299:9: Skipping __function_pointer__(): unresolved function pointer
      297.       INCREMENT(free_count);
      298.       if (free_impl != NULL && free_impl != &CRYPTO_free) {
      299.           free_impl(str, file, line);
                     ^
      300.           return;
      301.       }

crypto/mem.c:300:9: 
      298.       if (free_impl != NULL && free_impl != &CRYPTO_free) {
      299.           free_impl(str, file, line);
      300. >         return;
      301.       }
      302.   

crypto/mem.c:314:1: return from a call to CRYPTO_free
      312.       free(str);
      313.   #endif
      314. > }
      315.   
      316.   void CRYPTO_clear_free(void *str, size_t num, const char *file, int line)

crypto/bn/bn_ctx.c:246:5: 
    244.   {
    245.       OPENSSL_free(st->indexes);
    246. >     st->indexes = NULL;
    247.   }
    248.   

crypto/bn/bn_ctx.c:247:1: return from a call to BN_STACK_finish
    245.       OPENSSL_free(st->indexes);
    246.       st->indexes = NULL;
    247. > }
    248.   
    249.   

crypto/bn/bn_ctx.c:175:5: 
  173.   #endif
  174.       BN_STACK_finish(&ctx->stack);
  175. >     BN_POOL_finish(&ctx->pool);
  176.       OPENSSL_free(ctx);
  177.   }

crypto/bn/bn_ctx.c:284:1: start of procedure BN_POOL_finish()
    282.   }
    283.   
    284. > static void BN_POOL_finish(BN_POOL *p)
    285.   {
    286.       unsigned int loop;

crypto/bn/bn_ctx.c:289:12: Loop condition is false. Leaving loop
    287.       BIGNUM *bn;
    288.   
    289.       while (p->head) {
                      ^
    290.           for (loop = 0, bn = p->head->vals; loop++ < BN_CTX_POOL_SIZE; bn++)
    291.               if (bn->d)
