Access violation - Malloc problem

146:    unsigned short *sDate;
147:
148:    sDate = (unsigned short *)malloc(100);
17E4157C 6A 64                push        64h
17E4157E E8 05 4C 00 00       call        malloc (17e46188)
17E41583 83 C4 04             add         esp,4
17E41586 89 45 FC             mov         dword ptr [sDate],eax


When running only the line 17E4157E (malloc), I get next error :

First Chance Exception in : 0xC0000005: Access Violation