cifs: fix memory leak of an allocated cifs_ntsd structure

The call to SMB2_queary_acl can allocate memory to pntsd and also
return a failure via a call to SMB2_query_acl (and then query_info).
This occurs when query_info allocates the structure and then in
query_info the call to smb2_validate_and_copy_iov fails. Currently the
failure just returns without kfree'ing pntsd hence causing a memory
leak.

Currently, *data is allocated if it's not already pointing to a buffer,
so it needs to be kfree'd only if was allocated in query_info, so the
fix adds an allocated flag to track this.  Also set *dlen to zero on
an error just to be safe since *data is kfree'd.

Also set errno to -ENOMEM if the allocation of *data fails.

Signed-off-by: Colin Ian King <colin.king@canonical.com>
Signed-off-by: Steve French <stfrench@microsoft.com>
Reviewed-by: Dan Carpener <dan.carpenter@oracle.com>

diff --git a/fs/cifs/smb2pdu.c b/fs/cifs/smb2pdu.c
index 50811a7..0af87bd 100644 (file)
--- a/fs/cifs/smb2pdu.c
+++ b/fs/cifs/smb2pdu.c
@@ -2816,6 +2816,7 @@ query_info(const unsigned int xid, struct cifs_tcon *tcon,
        int resp_buftype = CIFS_NO_BUFFER;
        struct cifs_ses *ses = tcon->ses;
        int flags = 0;
+       bool allocated = false;
 
        cifs_dbg(FYI, "Query Info\n");
 
@@ -2855,14 +2856,21 @@ query_info(const unsigned int xid, struct cifs_tcon *tcon,
                                        "Error %d allocating memory for acl\n",
                                        rc);
                                *dlen = 0;
+                               rc = -ENOMEM;
                                goto qinf_exit;
                        }
+                       allocated = true;
                }
        }
 
        rc = smb2_validate_and_copy_iov(le16_to_cpu(rsp->OutputBufferOffset),
                                        le32_to_cpu(rsp->OutputBufferLength),
                                        &rsp_iov, min_len, *data);
+       if (rc && allocated) {
+               kfree(*data);
+               *data = NULL;
+               *dlen = 0;
+       }
 
 qinf_exit:
        SMB2_query_info_free(&rqst);