patch-2.1.40 linux/arch/m68k/kernel/sys_m68k.c

• Lines: 17
• Date: Sun May 18 17:10:37 1997
• Orig file: v2.1.39/linux/arch/m68k/kernel/sys_m68k.c
• Orig date: Wed Apr 23 19:01:15 1997

diff -u --recursive --new-file v2.1.39/linux/arch/m68k/kernel/sys_m68k.c linux/arch/m68k/kernel/sys_m68k.c
@@ -532,12 +532,15 @@
 		 */
 		vma = find_vma (current->mm, addr);
 		ret = -EINVAL;
+		/* Check for overflow.  */
+		if (addr + len < addr)
+			goto out;
 		if (vma == NULL || addr < vma->vm_start || addr + len > vma->vm_end)
 			goto out;
 	}
 
 	if (CPU_IS_020_OR_030) {
-		if (scope == FLUSH_SCOPE_LINE) {
+		if (scope == FLUSH_SCOPE_LINE && len < 256) {
 			unsigned long cacr;
 			__asm__ ("movec %%cacr, %0" : "=r" (cacr));
 			if (cache & FLUSH_CACHE_INSN)