From: Marek Behún <marek.behun@nic.cz>
Date: Fri, 24 Sep 2021 21:06:39 +0000 (+0200)
Subject: tools: kwboot: Fix buffer overflow in kwboot_terminal()
X-Git-Url: http://git.dujemihanovic.xyz/?a=commitdiff_plain;h=f30cb0d3b9fd2d7c51339404ddaeae53ba9b90f9;p=u-boot.git

tools: kwboot: Fix buffer overflow in kwboot_terminal()

The `in` variable is set to -1 in kwboot_terminal() if stdin is not a
tty. In this case we should not look whether -1 is set in fd_set, for it
can lead to a buffer overflow, which can be reproduced with
  echo "xyz" | ./tools/kwboot -t /dev/ttyUSB0

Signed-off-by: Marek Behún <marek.behun@nic.cz>
Reviewed-by: Stefan Roese <sr@denx.de>
---

diff --git a/tools/kwboot.c b/tools/kwboot.c
index 7feeaa45a2..e6e99849a7 100644
--- a/tools/kwboot.c
+++ b/tools/kwboot.c
@@ -552,7 +552,7 @@ kwboot_terminal(int tty)
 				break;
 		}
 
-		if (FD_ISSET(in, &rfds)) {
+		if (in >= 0 && FD_ISSET(in, &rfds)) {
 			rc = kwboot_term_pipe(in, tty, quit, &s);
 			if (rc)
 				break;