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

Related — Sat, 10 Mar 2018 03:39:12 +0000

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);

Whamcloud Community JIRA

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