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| author | Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com> | 2021-07-30 16:42:01 +0200 |
|---|---|---|
| committer | Jakub Kicinski <kuba@kernel.org> | 2021-07-30 17:22:52 +0200 |
| commit | ddecf5556f7fdf871fa8ce26b376e3e8ae6213b6 (patch) | |
| tree | e8527773c9e264f6f2a1e35eea5fb9e1490efb5d /net/nfc/nci/data.c | |
| parent | f2479c0a22948c5998938fa5bb9d98f9931791b7 (diff) | |
| download | lwn-ddecf5556f7fdf871fa8ce26b376e3e8ae6213b6.tar.gz lwn-ddecf5556f7fdf871fa8ce26b376e3e8ae6213b6.zip | |
nfc: nci: constify several pointers to u8, sk_buff and other structs
Several functions receive pointers to u8, sk_buff or other structs but
do not modify the contents so make them const. This allows doing the
same for local variables and in total makes the code a little bit safer.
This makes const also data passed as "unsigned long opt" argument to
nci_request() function. Usual flow for such functions is:
1. Receive "u8 *" and store it (the pointer) in a structure
allocated on stack (e.g. struct nci_set_config_param),
2. Call nci_request() or __nci_request() passing a callback function an
the pointer to the structure via an "unsigned long opt",
3. nci_request() calls the callback which dereferences "unsigned long
opt" in a read-only way.
This converts all above paths to use proper pointer to const data, so
entire flow is safer.
Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Diffstat (limited to 'net/nfc/nci/data.c')
| -rw-r--r-- | net/nfc/nci/data.c | 12 |
1 files changed, 6 insertions, 6 deletions
diff --git a/net/nfc/nci/data.c b/net/nfc/nci/data.c index ce3382be937f..6055dc9a82aa 100644 --- a/net/nfc/nci/data.c +++ b/net/nfc/nci/data.c @@ -26,7 +26,7 @@ void nci_data_exchange_complete(struct nci_dev *ndev, struct sk_buff *skb, __u8 conn_id, int err) { - struct nci_conn_info *conn_info; + const struct nci_conn_info *conn_info; data_exchange_cb_t cb; void *cb_context; @@ -80,7 +80,7 @@ static inline void nci_push_data_hdr(struct nci_dev *ndev, int nci_conn_max_data_pkt_payload_size(struct nci_dev *ndev, __u8 conn_id) { - struct nci_conn_info *conn_info; + const struct nci_conn_info *conn_info; conn_info = nci_get_conn_info_by_conn_id(ndev, conn_id); if (!conn_info) @@ -93,9 +93,9 @@ EXPORT_SYMBOL(nci_conn_max_data_pkt_payload_size); static int nci_queue_tx_data_frags(struct nci_dev *ndev, __u8 conn_id, struct sk_buff *skb) { - struct nci_conn_info *conn_info; + const struct nci_conn_info *conn_info; int total_len = skb->len; - unsigned char *data = skb->data; + const unsigned char *data = skb->data; unsigned long flags; struct sk_buff_head frags_q; struct sk_buff *skb_frag; @@ -166,7 +166,7 @@ exit: /* Send NCI data */ int nci_send_data(struct nci_dev *ndev, __u8 conn_id, struct sk_buff *skb) { - struct nci_conn_info *conn_info; + const struct nci_conn_info *conn_info; int rc = 0; pr_debug("conn_id 0x%x, plen %d\n", conn_id, skb->len); @@ -269,7 +269,7 @@ void nci_rx_data_packet(struct nci_dev *ndev, struct sk_buff *skb) __u8 pbf = nci_pbf(skb->data); __u8 status = 0; __u8 conn_id = nci_conn_id(skb->data); - struct nci_conn_info *conn_info; + const struct nci_conn_info *conn_info; pr_debug("len %d\n", skb->len); |