apps/ts.c:538: error: USE_AFTER_FREE
  call to `EVP_MD_CTX_free()` eventually accesses memory that was invalidated by call to `free()` on line 537 indirectly during the call to `EVP_DigestFinal()`.
Showing all 20 steps of the trace


apps/ts.c:526:30: invalidation part of the trace starts here
524.   
525.       if (input) {
526.           EVP_MD_CTX *md_ctx = EVP_MD_CTX_new();
                                    ^
527.           unsigned char buffer[4096];
528.           int length;

apps/ts.c:526:30: passed as argument to `EVP_MD_CTX_new`
  524.   
  525.       if (input) {
  526.           EVP_MD_CTX *md_ctx = EVP_MD_CTX_new();
                                      ^
  527.           unsigned char buffer[4096];
  528.           int length;

apps/ts.c:526:30: return from call to `EVP_MD_CTX_new`
  524.   
  525.       if (input) {
  526.           EVP_MD_CTX *md_ctx = EVP_MD_CTX_new();
                                      ^
  527.           unsigned char buffer[4096];
  528.           int length;

apps/ts.c:526:9: assigned
  524.   
  525.       if (input) {
  526.           EVP_MD_CTX *md_ctx = EVP_MD_CTX_new();
                 ^
  527.           unsigned char buffer[4096];
  528.           int length;

apps/ts.c:537:14: when calling `EVP_DigestFinal` here
  535.               EVP_DigestUpdate(md_ctx, buffer, length);
  536.           }
  537.           if (!EVP_DigestFinal(md_ctx, *md_value, NULL)) {
                      ^
  538.               EVP_MD_CTX_free(md_ctx);
  539.               return 0;

crypto/evp/digest.c:261:1: parameter `ctx` of EVP_DigestFinal
    259.   
    260.   /* The caller can assume that this removes any secret data from the context */
    261. > int EVP_DigestFinal(EVP_MD_CTX *ctx, unsigned char *md, unsigned int *size)
    262.   {
    263.       int ret;

crypto/evp/digest.c:265:5: when calling `EVP_MD_CTX_reset` here
    263.       int ret;
    264.       ret = EVP_DigestFinal_ex(ctx, md, size);
    265.       EVP_MD_CTX_reset(ctx);
               ^
    266.       return ret;
    267.   }

crypto/evp/digest.c:123:1: parameter `ctx` of EVP_MD_CTX_reset
      121.   
      122.   /* This call frees resources associated with the context */
      123. > int EVP_MD_CTX_reset(EVP_MD_CTX *ctx)
      124.   {
      125.       if (ctx == NULL)

crypto/evp/digest.c:137:9: when calling `CRYPTO_clear_free` here
      135.       if (ctx->digest && ctx->digest->ctx_size && ctx->md_data
      136.           && !EVP_MD_CTX_test_flags(ctx, EVP_MD_CTX_FLAG_REUSE)) {
      137.           OPENSSL_clear_free(ctx->md_data, ctx->digest->ctx_size);
                     ^
      138.       }
      139.       EVP_PKEY_CTX_free(ctx->pctx);

crypto/mem.c:249:1: parameter `str` of CRYPTO_clear_free
        247.   }
        248.   
        249. > void CRYPTO_clear_free(void *str, size_t num)
        250.   {
        251.       if (str == NULL)

crypto/mem.c:255:5: when calling `CRYPTO_free` here
        253.       if (num)
        254.           OPENSSL_cleanse(str, num);
        255.       CRYPTO_free(str);
                   ^
        256.   }

crypto/mem.c:234:1: parameter `str` of CRYPTO_free
          232.   }
          233.   
          234. > void CRYPTO_free(void *str)
          235.   {
          236.   #ifdef CRYPTO_MDEBUG

crypto/mem.c:245:5: was invalidated by call to `free()`
          243.       }
          244.   #else
          245.       free(str);
                     ^
          246.   #endif
          247.   }

apps/ts.c:526:30: use-after-lifetime part of the trace starts here
524.   
525.       if (input) {
526.           EVP_MD_CTX *md_ctx = EVP_MD_CTX_new();
                                    ^
527.           unsigned char buffer[4096];
528.           int length;

apps/ts.c:526:30: passed as argument to `EVP_MD_CTX_new`
  524.   
  525.       if (input) {
  526.           EVP_MD_CTX *md_ctx = EVP_MD_CTX_new();
                                      ^
  527.           unsigned char buffer[4096];
  528.           int length;

apps/ts.c:526:30: return from call to `EVP_MD_CTX_new`
  524.   
  525.       if (input) {
  526.           EVP_MD_CTX *md_ctx = EVP_MD_CTX_new();
                                      ^
  527.           unsigned char buffer[4096];
  528.           int length;

apps/ts.c:526:9: assigned
  524.   
  525.       if (input) {
  526.           EVP_MD_CTX *md_ctx = EVP_MD_CTX_new();
                 ^
  527.           unsigned char buffer[4096];
  528.           int length;

apps/ts.c:538:13: when calling `EVP_MD_CTX_free` here
  536.           }
  537.           if (!EVP_DigestFinal(md_ctx, *md_value, NULL)) {
  538.               EVP_MD_CTX_free(md_ctx);
                     ^
  539.               return 0;
  540.           }

crypto/mem.c:234:1: parameter `str` of CRYPTO_free
    232.   }
    233.   
    234. > void CRYPTO_free(void *str)
    235.   {
    236.   #ifdef CRYPTO_MDEBUG

crypto/mem.c:245:5: invalid access occurs here
    243.       }
    244.   #else
    245.       free(str);
               ^
    246.   #endif
    247.   }
