erors from Valgrind ,,

Hi every one,
i just started c programming... my program(some parts i got it from some site) compiles fine ,, but when i check the program with valgrind ,,, iget the errors..

my code

trie.h
-

Code:

---

typedef int Value;
typedef struct trieCDT *Trie;

---

trie.c

Code:

---

#define pool_size 1024*1024

typedef struct trieNodeTag{
        char key;
        Value value;
        struct trieNodeTag *next, *children;
}trieNode;

typedef struct posPoolspace{
        char *posList[pool_size];
        int listSize;
}posPool;

typedef struct trieCDT {
        trieNode *root;
        posPool *pool;
}trieCDT;

Trie createTrie(){
        Trie trie;
        trie = (Trie)malloc(sizeof(Trie));
        trie->root= NULL;
        trie->pool= (posPool*)malloc(sizeof(posPool));
        trie->pool->listSize=2;
        return trie;
}

void destroyTrie(Trie trie){

        trieNode *level = trie->root;
        destroyNodes(level);

        posPool *pool =trie->pool;
        int i=0;
        for(i=0;i<pool->listSize;i++)       
                free(pool->posList[i]);
       
        free(trie->pool);
        free(trie);

}

---

createTrie is called from some other function i have : loadDict .

with the valgrind i get many errors . errors:

==14965== 1 errors in context 3 of 20:
==14965== Invalid read of size 4
==14965== at 0x8049FF9: createTrie (in /home/prakash/Desktop/Work In Progress/LDC_Modifier/Modifier)
==14965== by 0x8049F8C: loadDict (in /home/prakash/Desktop/Work In Progress/LDC_Modifier/Modifier)
==14965== by 0x80494F4: main (in /home/prakash/Desktop/Work In Progress/LDC_Modifier/Modifier)
==14965== Address 0x419b074 is 0 bytes after a block of size 4 alloc'd
==14965== at 0x4025D2E: malloc (vg_replace_malloc.c:207)
==14965== by 0x8049FD5: createTrie (in /home/prakash/Desktop/Work In Progress/LDC_Modifier/Modifier)
==14965== by 0x8049F8C: loadDict (in /home/prakash/Desktop/Work In Progress/LDC_Modifier/Modifier)
==14965== by 0x80494F4: main (in /home/prakash/Desktop/Work In Progress/LDC_Modifier/Modifier)
==14965==
==14965== 1 errors in context 4 of 20:
==14965== Invalid write of size 4
==14965== at 0x8049FF3: createTrie (in /home/prakash/Desktop/Work In Progress/LDC_Modifier/Modifier)
==14965== by 0x8049F8C: loadDict (in /home/prakash/Desktop/Work In Progress/LDC_Modifier/Modifier)
==14965== by 0x80494F4: main (in /home/prakash/Desktop/Work In Progress/LDC_Modifier/Modifier)
==14965== Address 0x419b074 is 0 bytes after a block of size 4 alloc'd
==14965== at 0x4025D2E: malloc (vg_replace_malloc.c:207)
==14965== by 0x8049FD5: createTrie (in /home/prakash/Desktop/Work In Progress/LDC_Modifier/Modifier)
==14965== by 0x8049F8C: loadDict (in /home/prakash/Desktop/Work In Progress/LDC_Modifier/Modifier)
==14965== by 0x80494F4: main (in /home/prakash/Desktop/Work In Progress/LDC_Modifier/Modifier)

..
...
...
==14965== 1421209 errors in context 20 of 20:
==14965== Invalid read of size 4
==14965== at 0x804A2F4: destroyNodes (in /home/prakash/Desktop/Work In Progress/LDC_Modifier/Modifier)
==14965== by 0x804A2E5: destroyNodes (in /home/prakash/Desktop/Work In Progress/LDC_Modifier/Modifier)
==14965== by 0x804A2E5: destroyNodes (in /home/prakash/Desktop/Work In Progress/LDC_Modifier/Modifier)
==14965== by 0x804A2E5: destroyNodes (in /home/prakash/Desktop/Work In Progress/LDC_Modifier/Modifier)
==14965== by 0x804A2E5: destroyNodes (in /home/prakash/Desktop/Work In Progress/LDC_Modifier/Modifier)
==14965== by 0x804A31A: destroyTrie (in /home/prakash/Desktop/Work In Progress/LDC_Modifier/Modifier)
==14965== by 0x8049656: main (in /home/prakash/Desktop/Work In Progress/LDC_Modifier/Modifier)
==14965== Address 0x5259670 is 8 bytes inside a block of size 16 free'd
==14965== at 0x4024B4A: free (vg_replace_malloc.c:323)
==14965== by 0x804A2F0: destroyNodes (in /home/prakash/Desktop/Work In Progress/LDC_Modifier/Modifier)
==14965== by 0x804A2E5: destroyNodes (in /home/prakash/Desktop/Work In Progress/LDC_Modifier/Modifier)
==14965== by 0x804A2E5: destroyNodes (in /home/prakash/Desktop/Work In Progress/LDC_Modifier/Modifier)
==14965== by 0x804A2E5: destroyNodes (in /home/prakash/Desktop/Work In Progress/LDC_Modifier/Modifier)
==14965== by 0x804A2E5: destroyNodes (in /home/prakash/Desktop/Work In Progress/LDC_Modifier/Modifier)
==14965== by 0x804A31A: destroyTrie (in /home/prakash/Desktop/Work In Progress/LDC_Modifier/Modifier)
==14965== by 0x8049656: main (in /home/prakash/Desktop/Work In Progress/LDC_Modifier/Modifier)


why ami getting these errors ??/ please help me find the solution..

thanks in advance~~
prakash

sizeof (Trie) == sizeof( void*) != sizeof (struct trieCDT)

you are mallocing the wrong size

thanks , its ok now~~