crypto/ec/ec2_smpl.c:284: error: NULL_DEREFERENCE
  pointer `ctx` last assigned on line 263 could be null and is dereferenced by call to `BN_CTX_end()` at line 284, column 2.
Showing all 54 steps of the trace


crypto/ec/ec2_smpl.c:255:1: start of procedure ec_GF2m_simple_group_check_discriminant()
253.    * y^2 + x*y = x^3 + a*x^2 + b is an elliptic curve <=> b != 0 (mod p) 
254.    */
255. > int ec_GF2m_simple_group_check_discriminant(const EC_GROUP *group, BN_CTX *ctx)
256.   	{
257.   	int ret = 0;

crypto/ec/ec2_smpl.c:257:2: 
255.   int ec_GF2m_simple_group_check_discriminant(const EC_GROUP *group, BN_CTX *ctx)
256.   	{
257. > 	int ret = 0;
258.   	BIGNUM *b;
259.   	BN_CTX *new_ctx = NULL;

crypto/ec/ec2_smpl.c:259:2: 
257.   	int ret = 0;
258.   	BIGNUM *b;
259. > 	BN_CTX *new_ctx = NULL;
260.   
261.   	if (ctx == NULL)

crypto/ec/ec2_smpl.c:261:6: Taking true branch
259.   	BN_CTX *new_ctx = NULL;
260.   
261.   	if (ctx == NULL)
            ^
262.   		{
263.   		ctx = new_ctx = BN_CTX_new();

crypto/ec/ec2_smpl.c:263:3: 
261.   	if (ctx == NULL)
262.   		{
263. > 		ctx = new_ctx = BN_CTX_new();
264.   		if (ctx == NULL)
265.   			{

crypto/bn/bn_ctx.c:217:1: start of procedure BN_CTX_new()
  215.   #endif
  216.   
  217. > BN_CTX *BN_CTX_new(void)
  218.   	{
  219.   	BN_CTX *ret = OPENSSL_malloc(sizeof(BN_CTX));

crypto/bn/bn_ctx.c:219:2: 
  217.   BN_CTX *BN_CTX_new(void)
  218.   	{
  219. > 	BN_CTX *ret = OPENSSL_malloc(sizeof(BN_CTX));
  220.   	if(!ret)
  221.   		{

crypto/mem.c:291:1: start of procedure CRYPTO_malloc()
    289.   	}
    290.   
    291. > void *CRYPTO_malloc(int num, const char *file, int line)
    292.   	{
    293.   	void *ret = NULL;

crypto/mem.c:293:2: 
    291.   void *CRYPTO_malloc(int num, const char *file, int line)
    292.   	{
    293. > 	void *ret = NULL;
    294.   	extern unsigned char cleanse_ctr;
    295.   

crypto/mem.c:296:6: Taking false branch
    294.   	extern unsigned char cleanse_ctr;
    295.   
    296.   	if (num <= 0) return NULL;
                ^
    297.   
    298.   	allow_customize = 0;

crypto/mem.c:298:2: 
    296.   	if (num <= 0) return NULL;
    297.   
    298. > 	allow_customize = 0;
    299.   	if (malloc_debug_func != NULL)
    300.   		{

crypto/mem.c:299:6: Taking true branch
    297.   
    298.   	allow_customize = 0;
    299.   	if (malloc_debug_func != NULL)
                ^
    300.   		{
    301.   		allow_customize_debug = 0;

crypto/mem.c:301:3: 
    299.   	if (malloc_debug_func != NULL)
    300.   		{
    301. > 		allow_customize_debug = 0;
    302.   		malloc_debug_func(NULL, num, file, line, 0);
    303.   		}

crypto/mem.c:302:3: Skipping __function_pointer__(): unresolved function pointer
    300.   		{
    301.   		allow_customize_debug = 0;
    302.   		malloc_debug_func(NULL, num, file, line, 0);
             ^
    303.   		}
    304.   	ret = malloc_ex_func(num,file,line);

crypto/mem.c:304:2: Skipping __function_pointer__(): unresolved function pointer
    302.   		malloc_debug_func(NULL, num, file, line, 0);
    303.   		}
    304.   	ret = malloc_ex_func(num,file,line);
            ^
    305.   #ifdef LEVITTE_DEBUG_MEM
    306.   	fprintf(stderr, "LEVITTE_DEBUG_MEM:         > 0x%p (%d)\n", ret, num);

crypto/mem.c:308:6: Taking true branch
    306.   	fprintf(stderr, "LEVITTE_DEBUG_MEM:         > 0x%p (%d)\n", ret, num);
    307.   #endif
    308.   	if (malloc_debug_func != NULL)
                ^
    309.   		malloc_debug_func(ret, num, file, line, 1);
    310.   

crypto/mem.c:309:3: Skipping __function_pointer__(): unresolved function pointer
    307.   #endif
    308.   	if (malloc_debug_func != NULL)
    309.   		malloc_debug_func(ret, num, file, line, 1);
             ^
    310.   
    311.           /* Create a dependency on the value of 'cleanse_ctr' so our memory

crypto/mem.c:314:12: Taking false branch
    312.            * sanitisation function can't be optimised out. NB: We only do
    313.            * this for >2Kb so the overhead doesn't bother us. */
    314.           if(ret && (num > 2048))
                      ^
    315.                   ((unsigned char *)ret)[0] = cleanse_ctr;
    316.   

crypto/mem.c:317:2: 
    315.                   ((unsigned char *)ret)[0] = cleanse_ctr;
    316.   
    317. > 	return ret;
    318.   	}
    319.   

crypto/mem.c:318:2: return from a call to CRYPTO_malloc
    316.   
    317.   	return ret;
    318.   	}
            ^
    319.   
    320.   void *CRYPTO_realloc(void *str, int num, const char *file, int line)

crypto/bn/bn_ctx.c:220:6: Taking true branch
  218.   	{
  219.   	BN_CTX *ret = OPENSSL_malloc(sizeof(BN_CTX));
  220.   	if(!ret)
              ^
  221.   		{
  222.   		BNerr(BN_F_BN_CTX_NEW,ERR_R_MALLOC_FAILURE);

crypto/bn/bn_ctx.c:222:3: 
  220.   	if(!ret)
  221.   		{
  222. > 		BNerr(BN_F_BN_CTX_NEW,ERR_R_MALLOC_FAILURE);
  223.   		return NULL;
  224.   		}

crypto/err/err.c:664:1: start of procedure ERR_put_error()
    662.   /********************************************************/
    663.   
    664. > void ERR_put_error(int lib, int func, int reason, const char *file,
    665.   	     int line)
    666.   	{

crypto/err/err.c:688:2: Skipping ERR_get_state(): empty list of specs
    686.   	}
    687.   #endif
    688.   	es=ERR_get_state();
            ^
    689.   
    690.   	es->top=(es->top+1)%ERR_NUM_ERRORS;

crypto/err/err.c:690:2: 
    688.   	es=ERR_get_state();
    689.   
    690. > 	es->top=(es->top+1)%ERR_NUM_ERRORS;
    691.   	if (es->top == es->bottom)
    692.   		es->bottom=(es->bottom+1)%ERR_NUM_ERRORS;

crypto/err/err.c:691:6: Taking false branch
    689.   
    690.   	es->top=(es->top+1)%ERR_NUM_ERRORS;
    691.   	if (es->top == es->bottom)
                ^
    692.   		es->bottom=(es->bottom+1)%ERR_NUM_ERRORS;
    693.   	es->err_flags[es->top]=0;

crypto/err/err.c:693:2: 
    691.   	if (es->top == es->bottom)
    692.   		es->bottom=(es->bottom+1)%ERR_NUM_ERRORS;
    693. > 	es->err_flags[es->top]=0;
    694.   	es->err_buffer[es->top]=ERR_PACK(lib,func,reason);
    695.   	es->err_file[es->top]=file;

crypto/err/err.c:694:2: 
    692.   		es->bottom=(es->bottom+1)%ERR_NUM_ERRORS;
    693.   	es->err_flags[es->top]=0;
    694. > 	es->err_buffer[es->top]=ERR_PACK(lib,func,reason);
    695.   	es->err_file[es->top]=file;
    696.   	es->err_line[es->top]=line;

crypto/err/err.c:695:2: 
    693.   	es->err_flags[es->top]=0;
    694.   	es->err_buffer[es->top]=ERR_PACK(lib,func,reason);
    695. > 	es->err_file[es->top]=file;
    696.   	es->err_line[es->top]=line;
    697.   	err_clear_data(es,es->top);

crypto/err/err.c:696:2: 
    694.   	es->err_buffer[es->top]=ERR_PACK(lib,func,reason);
    695.   	es->err_file[es->top]=file;
    696. > 	es->err_line[es->top]=line;
    697.   	err_clear_data(es,es->top);
    698.   	}

crypto/err/err.c:697:2: Taking true branch
    695.   	es->err_file[es->top]=file;
    696.   	es->err_line[es->top]=line;
    697.   	err_clear_data(es,es->top);
            ^
    698.   	}
    699.   

crypto/err/err.c:697:2: Taking false branch
    695.   	es->err_file[es->top]=file;
    696.   	es->err_line[es->top]=line;
    697.   	err_clear_data(es,es->top);
            ^
    698.   	}
    699.   

crypto/err/err.c:697:2: Loop condition is false. Leaving loop
    695.   	es->err_file[es->top]=file;
    696.   	es->err_line[es->top]=line;
    697.   	err_clear_data(es,es->top);
            ^
    698.   	}
    699.   

crypto/err/err.c:698:2: return from a call to ERR_put_error
    696.   	es->err_line[es->top]=line;
    697.   	err_clear_data(es,es->top);
    698.   	}
            ^
    699.   
    700.   void ERR_clear_error(void)

crypto/bn/bn_ctx.c:223:3: 
  221.   		{
  222.   		BNerr(BN_F_BN_CTX_NEW,ERR_R_MALLOC_FAILURE);
  223. > 		return NULL;
  224.   		}
  225.   	/* Initialise the structure */

crypto/bn/bn_ctx.c:232:2: return from a call to BN_CTX_new
  230.   	ret->too_many = 0;
  231.   	return ret;
  232.   	}
          ^
  233.   
  234.   void BN_CTX_free(BN_CTX *ctx)

crypto/ec/ec2_smpl.c:264:7: Taking true branch
262.   		{
263.   		ctx = new_ctx = BN_CTX_new();
264.   		if (ctx == NULL)
             ^
265.   			{
266.   			ECerr(EC_F_EC_GF2M_SIMPLE_GROUP_CHECK_DISCRIMINANT, ERR_R_MALLOC_FAILURE);

crypto/ec/ec2_smpl.c:266:4: 
264.   		if (ctx == NULL)
265.   			{
266. > 			ECerr(EC_F_EC_GF2M_SIMPLE_GROUP_CHECK_DISCRIMINANT, ERR_R_MALLOC_FAILURE);
267.   			goto err;
268.   			}

crypto/err/err.c:664:1: start of procedure ERR_put_error()
  662.   /********************************************************/
  663.   
  664. > void ERR_put_error(int lib, int func, int reason, const char *file,
  665.   	     int line)
  666.   	{

crypto/err/err.c:688:2: Skipping ERR_get_state(): empty list of specs
  686.   	}
  687.   #endif
  688.   	es=ERR_get_state();
          ^
  689.   
  690.   	es->top=(es->top+1)%ERR_NUM_ERRORS;

crypto/err/err.c:690:2: 
  688.   	es=ERR_get_state();
  689.   
  690. > 	es->top=(es->top+1)%ERR_NUM_ERRORS;
  691.   	if (es->top == es->bottom)
  692.   		es->bottom=(es->bottom+1)%ERR_NUM_ERRORS;

crypto/err/err.c:691:6: Taking false branch
  689.   
  690.   	es->top=(es->top+1)%ERR_NUM_ERRORS;
  691.   	if (es->top == es->bottom)
              ^
  692.   		es->bottom=(es->bottom+1)%ERR_NUM_ERRORS;
  693.   	es->err_flags[es->top]=0;

crypto/err/err.c:693:2: 
  691.   	if (es->top == es->bottom)
  692.   		es->bottom=(es->bottom+1)%ERR_NUM_ERRORS;
  693. > 	es->err_flags[es->top]=0;
  694.   	es->err_buffer[es->top]=ERR_PACK(lib,func,reason);
  695.   	es->err_file[es->top]=file;

crypto/err/err.c:694:2: 
  692.   		es->bottom=(es->bottom+1)%ERR_NUM_ERRORS;
  693.   	es->err_flags[es->top]=0;
  694. > 	es->err_buffer[es->top]=ERR_PACK(lib,func,reason);
  695.   	es->err_file[es->top]=file;
  696.   	es->err_line[es->top]=line;

crypto/err/err.c:695:2: 
  693.   	es->err_flags[es->top]=0;
  694.   	es->err_buffer[es->top]=ERR_PACK(lib,func,reason);
  695. > 	es->err_file[es->top]=file;
  696.   	es->err_line[es->top]=line;
  697.   	err_clear_data(es,es->top);

crypto/err/err.c:696:2: 
  694.   	es->err_buffer[es->top]=ERR_PACK(lib,func,reason);
  695.   	es->err_file[es->top]=file;
  696. > 	es->err_line[es->top]=line;
  697.   	err_clear_data(es,es->top);
  698.   	}

crypto/err/err.c:697:2: Taking true branch
  695.   	es->err_file[es->top]=file;
  696.   	es->err_line[es->top]=line;
  697.   	err_clear_data(es,es->top);
          ^
  698.   	}
  699.   

crypto/err/err.c:697:2: Taking false branch
  695.   	es->err_file[es->top]=file;
  696.   	es->err_line[es->top]=line;
  697.   	err_clear_data(es,es->top);
          ^
  698.   	}
  699.   

crypto/err/err.c:697:2: Loop condition is false. Leaving loop
  695.   	es->err_file[es->top]=file;
  696.   	es->err_line[es->top]=line;
  697.   	err_clear_data(es,es->top);
          ^
  698.   	}
  699.   

crypto/err/err.c:698:2: return from a call to ERR_put_error
  696.   	es->err_line[es->top]=line;
  697.   	err_clear_data(es,es->top);
  698.   	}
          ^
  699.   
  700.   void ERR_clear_error(void)

crypto/ec/ec2_smpl.c:283:1: 
281.   	ret = 1;
282.   
283. > err:
284.   	BN_CTX_end(ctx);
285.   	if (new_ctx != NULL)

crypto/ec/ec2_smpl.c:284:2: 
282.   
283.   err:
284. > 	BN_CTX_end(ctx);
285.   	if (new_ctx != NULL)
286.   		BN_CTX_free(new_ctx);

crypto/bn/bn_ctx.c:270:1: start of procedure BN_CTX_end()
  268.   	}
  269.   
  270. > void BN_CTX_end(BN_CTX *ctx)
  271.   	{
  272.   	CTXDBG_ENTRY("BN_CTX_end", ctx);

crypto/bn/bn_ctx.c:273:5: Taking true branch
  271.   	{
  272.   	CTXDBG_ENTRY("BN_CTX_end", ctx);
  273.   	if(ctx->err_stack)
             ^
  274.   		ctx->err_stack--;
  275.   	else
