Merge: scsi: qedf: Ensure the copied buf is NUL terminated

MR: https://gitlab.com/redhat/centos-stream/src/kernel/centos-stream-9/-/merge_requests/4807

JIRA: https://issues.redhat.com/browse/RHEL-44202

JIRA: https://issues.redhat.com/browse/RHEL-44201

CVE: CVE-2024-38559

Currently, we allocate a count-sized kernel buffer and copy count from
userspace to that buffer. Later, we use kstrtouint on this buffer but we
don't ensure that the string is terminated inside the buffer, this can
lead to OOB read when using kstrtouint. Fix this issue by using
memdup_user_nul instead of memdup_user.
    
Signed-off-by: John Meneghini <jmeneghi@redhat.com>

Approved-by: Maurizio Lombardi <mlombard@redhat.com>
Approved-by: Chris Leech <cleech@redhat.com>
Approved-by: CKI KWF Bot <cki-ci-bot+kwf-gitlab-com@redhat.com>

Merged-by: Lucas Zampieri <lzampier@redhat.com>

Author: zampierilucas

drivers/scsi/qedf/qedf_debugfs.c

@@ -170,7 +170,7 @@ qedf_dbg_debug_cmd_write(struct file *filp, const char __user *buffer,
 	if (!count || *ppos)
 		return 0;
 
-	kern_buf = memdup_user(buffer, count);
+	kern_buf = memdup_user_nul(buffer, count);
 	if (IS_ERR(kern_buf))
 		return PTR_ERR(kern_buf);