From: Heinrich Schuchardt <heinrich.schuchardt@canonical.com>
Date: Tue, 3 Oct 2023 01:09:01 +0000 (+0200)
Subject: input: avoid NULL dereference
X-Git-Url: http://git.dujemihanovic.xyz/img/static/%7B%7B%20%28.OutputFormats.Get?a=commitdiff_plain;h=2d307fb9ed2065cc1596a3c4263e55d1cae6799d;p=u-boot.git

input: avoid NULL dereference

Before using the result of env_get("stdin") we must check if it is NULL.

Avoid #if. This resolves the -Wunused-but-set-variable issue and we don't
need a dummy assignment in the else branch. Anyway this warning is
disabled in the Makefile.

For sake of readability use an early return after the configuration check.

Checking CONFIG_SPL_BUILD is incorrect as env_get() is only defined if
CONFIG_$(SPL_TPL)ENV_SUPPORT=y.

Fixes: 985ca3945fa3 ("spl: input: Allow input in SPL and TPL")
Signed-off-by: Heinrich Schuchardt <heinrich.schuchardt@canonical.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Tom Rini <trini@konsulko.com>
---

diff --git a/drivers/input/input.c b/drivers/input/input.c
index a4341e8c7c..8a6506e7c6 100644
--- a/drivers/input/input.c
+++ b/drivers/input/input.c
@@ -669,17 +669,22 @@ int input_stdio_register(struct stdio_dev *dev)
 	int error;
 
 	error = stdio_register(dev);
-#if !defined(CONFIG_SPL_BUILD) || CONFIG_IS_ENABLED(ENV_SUPPORT)
-	/* check if this is the standard input device */
-	if (!error && strcmp(env_get("stdin"), dev->name) == 0) {
-		/* reassign the console */
-		if (OVERWRITE_CONSOLE ||
-				console_assign(stdin, dev->name))
-			return -1;
+
+	if (!CONFIG_IS_ENABLED(ENV_SUPPORT))
+		return 0;
+
+	if (!error) {
+		const char *cstdin;
+
+		/* check if this is the standard input device */
+		cstdin = env_get("stdin");
+		if (cstdin && !strcmp(cstdin, dev->name)) {
+			/* reassign the console */
+			if (OVERWRITE_CONSOLE ||
+			    console_assign(stdin, dev->name))
+				return -1;
+		}
 	}
-#else
-	error = error;
-#endif
 
 	return 0;
 }