platform/x86/amd/hsmp: Ensure sock->metric_tbl_addr is non-NULL

JIRA: https://issues.redhat.com/browse/RHEL-102859

commit 2c78fb2
Author: Suma Hegde <suma.hegde@amd.com>
Date:   Thu Aug 7 10:06:37 2025 +0000

    platform/x86/amd/hsmp: Ensure sock->metric_tbl_addr is non-NULL

    If metric table address is not allocated, accessing metrics_bin will
    result in a NULL pointer dereference, so add a check.

    Fixes: 5150542 ("platform/x86/amd/hsmp: add support for metrics tbl")
    Signed-off-by: Suma Hegde <suma.hegde@amd.com>
    Link: https://lore.kernel.org/r/20250807100637.952729-1-suma.hegde@amd.com
    Reviewed-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
    Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>

Signed-off-by: David Arcari <darcari@redhat.com>

Author: darcari

drivers/platform/x86/amd/hsmp/hsmp.c

@@ -356,6 +356,11 @@ ssize_t hsmp_metric_tbl_read(struct hsmp_socket *sock, char *buf, size_t size)
 	if (!sock || !buf)
 		return -EINVAL;
 
+	if (!sock->metric_tbl_addr) {
+		dev_err(sock->dev, "Metrics table address not available\n");
+		return -ENOMEM;
+	}
+
 	/* Do not support lseek(), also don't allow more than the size of metric table */
 	if (size != sizeof(struct hsmp_metric_table)) {
 		dev_err(sock->dev, "Wrong buffer size\n");