The userspace load can put up to 2048 bits into an xlen bit stack
buffer. We want only xlen bits, so check the size beforehand.
Fixes: 2fa290372d ("RISC-V: KVM: add 'vlenb' Vector CSR")
Cc: stable@vger.kernel.org
Signed-off-by: Radim Krčmář <rkrcmar@ventanamicro.com>
Reviewed-by: Nutty Liu <liujingqi@lanxincomputing.com>
Reviewed-by: Daniel Henrique Barboza <dbarboza@ventanamicro.com>
Link: https://lore.kernel.org/r/20250805104418.196023-4-rkrcmar@ventanamicro.com
Signed-off-by: Anup Patel <anup@brainfault.org>
799766208f