From: Matthias Kruk <m@m10k.eu>
Date: Sun, 5 Jan 2020 08:01:19 +0000 (+0900)
Subject: sys_debug: Make sure strings are properly NUL-terminated before passing them to dbg_p... 
X-Git-Url: https://git.corax.cc/?a=commitdiff_plain;h=2a023d26e3028daafab7013adab737b7a3c341c0;p=corax

sys_debug: Make sure strings are properly NUL-terminated before passing them to dbg_printf()
---

diff --git a/kernel/core/posixcall.c b/kernel/core/posixcall.c
index 289a9ee..7fe4b57 100644
--- a/kernel/core/posixcall.c
+++ b/kernel/core/posixcall.c
@@ -413,10 +413,10 @@ int sys_debug(const char *str, const u32_t len)
 	process_t *cproc;
 
 	cproc = process_get_current();
-	ret_val = len < sizeof(buffer) ? len : sizeof(buffer);
+	ret_val = len < (sizeof(buffer) - 1) ? len : (sizeof(buffer) - 1);
 
 	process_memcpy_ptok(cproc, buffer, str, ret_val);
-	buffer[sizeof(buffer) - 1] = 0;
+	buffer[ret_val] = 0;
 
 	dbg_printf("%s\n", buffer);