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-rw-r--r--src/hook.c6
1 files changed, 4 insertions, 2 deletions
diff --git a/src/hook.c b/src/hook.c
index f625966..09dc403 100644
--- a/src/hook.c
+++ b/src/hook.c
@@ -1,5 +1,6 @@
/*
* Copyright © 2021 Michael Smith <mikesmiffy128@gmail.com>
+ * Copyright © 2022 Willian Henrique <wsimanbrazil@yahoo.com.br>
*
* Permission to use, copy, modify, and/or distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
@@ -58,10 +59,11 @@ void *hook_inline(void *func_, void *target) {
len += ud_insn_len(&udis);
}
// for simplicity, just bump alloc the trampoline. no need to free anyway
- if (nexttrampoline - trampolines > len + 6) goto nospc;
+ if (nexttrampoline - trampolines > sizeof(trampolines) - len - 6) goto nospc;
uchar *trampoline = (uchar *)InterlockedExchangeAdd(
(volatile long *)&nexttrampoline, len + 6);
- if (trampoline - trampolines > len + 6) { // avoid TOCTOU
+ // avoid TOCTOU
+ if (trampoline - trampolines > sizeof(trampolines) - len - 6) {
nospc: con_warn("hook_inline: out of trampoline space\n");
return 0;
}