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authorGustavo A. R. Silva <gustavo@embeddedor.com>2020-02-27 00:20:00 +0300
committerDavid S. Miller <davem@davemloft.net>2020-02-27 23:06:20 +0300
commitda60fbe7ef942d64b4d80e99cc9b0205db5964b9 (patch)
treeec1ffd9f3659a9ded8c02d4c3111364d8677b5d2 /include
parent6dd7f1a1fe20222d152875935f3ee0a009342ade (diff)
downloadlinux-da60fbe7ef942d64b4d80e99cc9b0205db5964b9.tar.xz
NFC: Replace zero-length array with flexible-array member
The current codebase makes use of the zero-length array language extension to the C90 standard, but the preferred mechanism to declare variable-length types such as these ones is a flexible array member[1][2], introduced in C99: struct foo { int stuff; struct boo array[]; }; By making use of the mechanism above, we will get a compiler warning in case the flexible array does not occur last in the structure, which will help us prevent some kind of undefined behavior bugs from being inadvertently introduced[3] to the codebase from now on. Also, notice that, dynamic memory allocations won't be affected by this change: "Flexible array members have incomplete type, and so the sizeof operator may not be applied. As a quirk of the original implementation of zero-length arrays, sizeof evaluates to zero."[1] This issue was found with the help of Coccinelle. [1] https://gcc.gnu.org/onlinedocs/gcc/Zero-Length.html [2] https://github.com/KSPP/linux/issues/21 [3] commit 76497732932f ("cxgb3/l2t: Fix undefined behaviour") Signed-off-by: Gustavo A. R. Silva <gustavo@embeddedor.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'include')
-rw-r--r--include/net/nfc/nci.h14
-rw-r--r--include/net/nfc/nfc.h2
2 files changed, 8 insertions, 8 deletions
diff --git a/include/net/nfc/nci.h b/include/net/nfc/nci.h
index 6ab5a83f597c..0550e0380b8d 100644
--- a/include/net/nfc/nci.h
+++ b/include/net/nfc/nci.h
@@ -244,13 +244,13 @@ struct dest_spec_params {
struct core_conn_create_dest_spec_params {
__u8 type;
__u8 length;
- __u8 value[0];
+ __u8 value[];
} __packed;
struct nci_core_conn_create_cmd {
__u8 destination_type;
__u8 number_destination_params;
- struct core_conn_create_dest_spec_params params[0];
+ struct core_conn_create_dest_spec_params params[];
} __packed;
#define NCI_OP_CORE_CONN_CLOSE_CMD nci_opcode_pack(NCI_GID_CORE, 0x05)
@@ -321,7 +321,7 @@ struct nci_core_init_rsp_1 {
__u8 status;
__le32 nfcc_features;
__u8 num_supported_rf_interfaces;
- __u8 supported_rf_interfaces[0]; /* variable size array */
+ __u8 supported_rf_interfaces[]; /* variable size array */
/* continuted in nci_core_init_rsp_2 */
} __packed;
@@ -338,7 +338,7 @@ struct nci_core_init_rsp_2 {
struct nci_core_set_config_rsp {
__u8 status;
__u8 num_params;
- __u8 params_id[0]; /* variable size array */
+ __u8 params_id[]; /* variable size array */
} __packed;
#define NCI_OP_CORE_CONN_CREATE_RSP nci_opcode_pack(NCI_GID_CORE, 0x04)
@@ -501,18 +501,18 @@ struct nci_rf_nfcee_action_ntf {
__u8 nfcee_id;
__u8 trigger;
__u8 supported_data_length;
- __u8 supported_data[0];
+ __u8 supported_data[];
} __packed;
#define NCI_OP_NFCEE_DISCOVER_NTF nci_opcode_pack(NCI_GID_NFCEE_MGMT, 0x00)
struct nci_nfcee_supported_protocol {
__u8 num_protocol;
- __u8 supported_protocol[0];
+ __u8 supported_protocol[];
} __packed;
struct nci_nfcee_information_tlv {
__u8 num_tlv;
- __u8 information_tlv[0];
+ __u8 information_tlv[];
} __packed;
struct nci_nfcee_discover_ntf {
diff --git a/include/net/nfc/nfc.h b/include/net/nfc/nfc.h
index 5d277d68fd8d..2cd3a261bcbc 100644
--- a/include/net/nfc/nfc.h
+++ b/include/net/nfc/nfc.h
@@ -146,7 +146,7 @@ struct nfc_evt_transaction {
u32 aid_len;
u8 aid[NFC_MAX_AID_LENGTH];
u8 params_len;
- u8 params[0];
+ u8 params[];
} __packed;
struct nfc_genl_data {