Check and immediately reject negative disk offset if disk access is 64-bit.

diff --git a/hardfile.cpp b/hardfile.cpp
index d5dc0baa7a84d16a3d0efa3a4e04ecc99bc03c46..2fbf8b2183b32f00e720d3da65926c3208c98c17 100644 (file)
--- a/hardfile.cpp
+++ b/hardfile.cpp
@@ -1183,6 +1183,8 @@ static int checkbounds (struct hardfiledata *hfd, uae_u64 offset, uae_u64 len)
                return 0;
        if (offset + len > hfd->virtsize)
                return 0;
+       if (offset > 0xffffffff && (uae_s64)offset < 0)
+               return 0;
        return 1;
 }
 
@@ -1897,7 +1899,7 @@ static uae_u32 hardfile_do_io (struct hardfiledata *hfd, struct hardfileprivdata
                        unaligned (cmd, offset64, len, hfd->ci.blocksize);
                        goto bad_len;
                }
-               if (len + offset64 > hfd->virtsize) {
+               if (len + offset64 > hfd->virtsize || (uae_s64)offset64 < 0) {
                        outofbounds (cmd, offset64, len, hfd->virtsize);
                        goto bad_len;
                }
@@ -1948,7 +1950,7 @@ static uae_u32 hardfile_do_io (struct hardfiledata *hfd, struct hardfileprivdata
                                unaligned (cmd, offset64, len, hfd->ci.blocksize);
                                goto bad_len;
                        }
-                       if (len + offset64 > hfd->virtsize) {
+                       if (len + offset64 > hfd->virtsize || (uae_s64)offset64 < 0) {
                                outofbounds (cmd, offset64, len, hfd->virtsize);
                                goto bad_len;
                        }