RISC-V: Do no continue isa string parsing without correct XLEN

The isa string should begin with either rv64 or rv32. Otherwise, it is
an incorrect isa string. Currently, the string parsing continues even if
it doesnot begin with current XLEN.

Fix this by checking if it found "rv64" or "rv32" in the beginning.
Tested-by: Heiko Stuebner <heiko@sntech.de>
Signed-off-by: Atish Patra <atishp@rivosinc.com>
Reviewed-by: Anup Patel <anup@brainfault.org>
Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>

arch/riscv/kernel/cpufeature.c

@@ -84,6 +84,7 @@ void __init riscv_fill_hwcap(void)
 	for_each_of_cpu_node(node) {
 		unsigned long this_hwcap = 0;
 		DECLARE_BITMAP(this_isa, RISCV_ISA_EXT_MAX);
+		const char *temp;
 
 		if (riscv_of_processor_hartid(node) < 0)
 			continue;
@@ -93,6 +94,7 @@ void __init riscv_fill_hwcap(void)
 			continue;
 		}
 
+		temp = isa;
 #if IS_ENABLED(CONFIG_32BIT)
 		if (!strncmp(isa, "rv32", 4))
 			isa += 4;
@@ -100,6 +102,9 @@ void __init riscv_fill_hwcap(void)
 		if (!strncmp(isa, "rv64", 4))
 			isa += 4;
 #endif
+		/* The riscv,isa DT property must start with rv64 or rv32 */
+		if (temp == isa)
+			continue;
 		bitmap_zero(this_isa, RISCV_ISA_EXT_MAX);
 		for (; *isa; ++isa) {
 			const char *ext = isa++;