crypto/rsa/rsa_x931g.c:191: error: NULL_DEREFERENCE
  pointer `ctx` last assigned on line 150 could be null and is dereferenced by call to `BN_CTX_free()` at line 191, column 5.
Showing all 24 steps of the trace


crypto/rsa/rsa_x931g.c:143:1: start of procedure RSA_X931_generate_key_ex()
141.   }
142.   
143. > int RSA_X931_generate_key_ex(RSA *rsa, int bits, const BIGNUM *e,
144.                                BN_GENCB *cb)
145.   {

crypto/rsa/rsa_x931g.c:146:5: 
144.                                BN_GENCB *cb)
145.   {
146. >     int ok = 0;
147.       BIGNUM *Xp = NULL, *Xq = NULL;
148.       BN_CTX *ctx = NULL;

crypto/rsa/rsa_x931g.c:147:5: 
145.   {
146.       int ok = 0;
147. >     BIGNUM *Xp = NULL, *Xq = NULL;
148.       BN_CTX *ctx = NULL;
149.   

crypto/rsa/rsa_x931g.c:148:5: 
146.       int ok = 0;
147.       BIGNUM *Xp = NULL, *Xq = NULL;
148. >     BN_CTX *ctx = NULL;
149.   
150.       ctx = BN_CTX_new();

crypto/rsa/rsa_x931g.c:150:5: Skipping BN_CTX_new(): empty list of specs
148.       BN_CTX *ctx = NULL;
149.   
150.       ctx = BN_CTX_new();
           ^
151.       if (ctx == NULL)
152.           goto error;

crypto/rsa/rsa_x931g.c:151:9: Taking true branch
149.   
150.       ctx = BN_CTX_new();
151.       if (ctx == NULL)
               ^
152.           goto error;
153.   

crypto/rsa/rsa_x931g.c:188:2: 
186.       ok = 1;
187.   
188. >  error:
189.       if (ctx)
190.           BN_CTX_end(ctx);

crypto/rsa/rsa_x931g.c:189:9: Taking false branch
187.   
188.    error:
189.       if (ctx)
               ^
190.           BN_CTX_end(ctx);
191.       BN_CTX_free(ctx);

crypto/rsa/rsa_x931g.c:191:5: 
189.       if (ctx)
190.           BN_CTX_end(ctx);
191. >     BN_CTX_free(ctx);
192.   
193.       if (ok)

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)
