[LU-7945] Suspicious dereference of pointer before NULL check in mdt_handle_idmap()

• Type: Bug
• Resolution: Fixed
• Priority: Minor
• Fix Version/s: Lustre 2.9.0
• Affects Version/s: Lustre 2.9.0
• Labels: kw
• Severity: 3
• Assignee: WC Triage
• Reporter: Dmitry Eremin (Inactive)

Description

Suspicious dereference of pointer 'req->rq_export' by passing argument 1 to function 'mdt_exp2dev' at line 138 before NULL check at line 146

• An event which alters the program's state, leading to the defect
  mdt_idmap.c:138: 'req->rq_export' is dereferenced by being passed as argument 1 to function 'mdt_exp2dev'.
• An event which alters the program's state, leading to the defect
  mdt_internal.h:915: 'exp' is passed to function 'mdt_exp2dev'.
• An event which alters the program's state, leading to the defect
  mdt_internal.h:917: 'exp' is explicitly dereferenced.
• An event which alters the program's state, leading to the defect
  mdt_idmap.c:146: 'req->rq_export' is checked for NULL.

  135		int mdt_handle_idmap(struct tgt_session_info *tsi)
  136		{
  137			struct ptlrpc_request	*req = tgt_ses_req(tsi);
  138			struct mdt_device	*mdt = mdt_exp2dev(req->rq_export);
  139		        struct mdt_export_data *med;
  140		        struct ptlrpc_user_desc *pud = req->rq_user_desc;
  141		        struct md_identity *identity;
  142		        __u32 opc;
  143		        int rc = 0;
  144		        ENTRY;
  145		 
  146		        if (!req->rq_export)
  147		                RETURN(0);
  

Issue Links

• is related to: LU-6971 Remove obsolete remote client and "lfs cp|ls|getacl|setacl" commands