Don't call strcmp with a NULL pointer.

In particular, on the AM335x, which comes up with no memory
mapped to low addresses, dereferencing the NULL causes a crash.

2 files changed, 18 insertions, 4 deletions

diff --git a/sys/boot/uboot/common/main.c b/sys/boot/uboot/common/main.c
index 7e961fd..9d7e9dc 100644
--- a/sys/boot/uboot/common/main.c
+++ b/sys/boot/uboot/common/main.c
@@ -116,6 +116,16 @@ meminfo(void)
 	}
 }
 
+static uint64_t
+uboot_loadaddr(u_int type, void *data, uint64_t addr)
+{
+	printf("uboot_loadaddr: type=%d data=0x%x addr=0x%x\n",
+	    type, data, addr);
+	if (type == 1)
+		return 0x40000000;
+	return (addr);
+}
+
 int
 main(void)
 {
@@ -211,6 +221,7 @@ main(void)
 	archsw.arch_copyout = uboot_copyout;
 	archsw.arch_readin = uboot_readin;
 	archsw.arch_autoload = uboot_autoload;
+	archsw.arch_loadaddr = uboot_loadaddr;
 
 	interact();				/* doesn't return */
 
diff --git a/sys/boot/uboot/common/metadata.c b/sys/boot/uboot/common/metadata.c
index 7b6e1fc..ae20584 100644
--- a/sys/boot/uboot/common/metadata.c
+++ b/sys/boot/uboot/common/metadata.c
@@ -72,6 +72,7 @@ static int
 md_getboothowto(char *kargs)
 {
 	char	*cp;
+	char	*p;
 	int	howto;
 	int	active;
 	int	i;
@@ -132,10 +133,12 @@ md_getboothowto(char *kargs)
 		if (getenv(howto_names[i].ev) != NULL)
 			howto |= howto_names[i].mask;
 	}
-	if (!strcmp(getenv("console"), "comconsole"))
-		howto |= RB_SERIAL;
-	if (!strcmp(getenv("console"), "nullconsole"))
-		howto |= RB_MUTE;
+	if ((p = getenv("console"))) {
+		if (!strcmp(p, "comconsole"))
+			howto |= RB_SERIAL;
+		if (!strcmp(p, "nullconsole"))
+			howto |= RB_MUTE;
+	}
 
 	return(howto);
 }