X-Git-Url: http://shamusworld.gotdns.org/cgi-bin/gitweb.cgi?a=blobdiff_plain;f=direct.c;h=809bb79090460d4632a7c397e5de0061819af491;hb=ca744716ef85b25c66ebd03d54035e06a89558fc;hp=d6d6c3f2e63499d7301253b41f9881eb72daef08;hpb=9ecc6f5e49e1740adee78dd45e1115c7e4fcc314;p=rmac

diff --git a/direct.c b/direct.c
index d6d6c3f..809bb79 100644
--- a/direct.c
+++ b/direct.c
@@ -1,7 +1,7 @@
 //
-// RMAC - Reboot's Macro Assembler for all Atari computers
+// RMAC - Renamed Macro Assembler for all Atari computers
 // DIRECT.C - Directive Handling
-// Copyright (C) 199x Landon Dyer, 2011-2020 Reboot and Friends
+// Copyright (C) 199x Landon Dyer, 2011-2021 Reboot and Friends
 // RMAC derived from MADMAC v1.07 Written by Landon Dyer, 1986
 // Source utilised with the kind permission of Landon Dyer
 //
@@ -622,6 +622,10 @@ allright:
 					close(fd);
 					return ERROR;
 				}
+				if ((int64_t)size <= 0)
+				{
+					return error("invalid incbin size requested");
+				}
 			}
 			else
 				size = lseek(fd, 0L, SEEK_END);
@@ -641,7 +645,10 @@ allright:
 					}
 
 					lseek(fd, pos, SEEK_SET);
-					size -= pos;
+					if ((int64_t)(size - pos) < 0)
+					{
+						return error("requested incbin size out of range");
+					}
 				}
 				else
 				{