psxbios: avoid unsafe pointer access

sanitizers were not happy

diff --git a/libpcsxcore/psxbios.c b/libpcsxcore/psxbios.c
index 7dd9f9c..0fe3499 100644 (file)
--- a/libpcsxcore/psxbios.c
+++ b/libpcsxcore/psxbios.c
@@ -2857,13 +2857,16 @@ void psxBios_nextfile() { // 43
 }
 
 #define burename(mcd) { \
+       char *pa0 = Ra0; \
+       char *pa1 = Ra1; \
+       if (pa0 != INVALID_PTR && pa1 != INVALID_PTR) \
        for (i=1; i<16; i++) { \
                int namelen, j, xor = 0; \
                ptr = Mcd##mcd##Data + 128 * i; \
                if ((*ptr & 0xF0) != 0x50) continue; \
-               if (strcmp(Ra0+5, ptr+0xa)) continue; \
-               namelen = strlen(Ra1+5); \
-               memcpy(ptr+0xa, Ra1+5, namelen); \
+               if (strcmp(pa0+5, ptr+0xa)) continue; \
+               namelen = strlen(pa1+5); \
+               memcpy(ptr+0xa, pa1+5, namelen); \
                memset(ptr+0xa+namelen, 0, 0x75-namelen); \
                for (j=0; j<127; j++) xor^= ptr[j]; \
                ptr[127] = xor; \