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Code Issues Releases Wiki Activity

staging: Replace zero-length array with flexible-array member

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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 7649773293 ("cxgb3/l2t: Fix undefined behaviour")

Signed-off-by: Gustavo A. R. Silva <gustavo@embeddedor.com>
Link: https://lore.kernel.org/r/20200220132908.GA30501@embeddedor
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Gustavo A. R. Silva 2020-02-20 07:29:08 -06:00 committed by Greg Kroah-Hartman
parent cf7e44daa7
commit 5979afa2c4
14 changed files with 52 additions and 52 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

2
drivers/staging/gdm724x/gdm_mux.h
View file

@ -29,7 +29,7 @@ struct mux_pkt_header {
__le32 seq_num;
__le32 payload_size;
__le16 packet_type;
unsigned char data[0];
unsigned char data[];
};
struct mux_tx {

6
drivers/staging/gdm724x/hci_packet.h
View file

@ -28,7 +28,7 @@
struct hci_packet {
__dev16 cmd_evt;
__dev16 len;
u8 data[0];
u8 data[];
} __packed;
struct tlv {
@ -51,7 +51,7 @@ struct sdu {
__dev32 dft_eps_ID;
__dev32 bearer_ID;
__dev32 nic_type;
u8 data[0];
u8 data[];
} __packed;
struct multi_sdu {
@ -59,7 +59,7 @@ struct multi_sdu {
__dev16 len;
__dev16 num_packet;
__dev16 reserved;
u8 data[0];
u8 data[];
} __packed;
struct hci_pdn_table_ind {

2
drivers/staging/greybus/audio_apbridgea.h
View file

@ -65,7 +65,7 @@
struct audio_apbridgea_hdr {
__u8 type;
__le16 i2s_port;
__u8 data[0];
__u8 data[];
} __packed;
struct audio_apbridgea_set_config_request {

4
drivers/staging/ks7010/ks_hostif.h
View file

@ -70,7 +70,7 @@ struct hostif_data_request {
#define TYPE_DATA 0x0000
#define TYPE_AUTH 0x0001
__le16 reserved;
u8 data[0];
u8 data[];
} __packed;
#define TYPE_PMK1 0x0001
@ -194,7 +194,7 @@ enum mib_data_type {
struct hostif_mib_value {
__le16 size;
__le16 type;
u8 body[0];
u8 body[];
} __packed;
struct hostif_mib_get_confirm_t {

2
drivers/staging/media/allegro-dvt/allegro-core.c
View file

@ -434,7 +434,7 @@ struct mcu_msg_push_buffers_internal_buffer {
struct mcu_msg_push_buffers_internal {
struct mcu_msg_header header;
u32 channel_id;
struct mcu_msg_push_buffers_internal_buffer buffer[0];
struct mcu_msg_push_buffers_internal_buffer buffer[];
} __attribute__ ((__packed__));
struct mcu_msg_put_stream_buffer {

2
drivers/staging/octeon-usb/octeon-hcd.c
View file

@ -406,7 +406,7 @@ struct octeon_hcd {
*/
struct octeon_temp_buffer {
void *orig_buffer;
u8 data[0];
u8 data[];
};
static inline struct usb_hcd *octeon_to_hcd(struct octeon_hcd *p)

30
drivers/staging/rtl8192e/rtllib.h
View file

@ -728,14 +728,14 @@ struct rtllib_pspoll_hdr {
struct rtllib_hdr {
__le16 frame_ctl;
__le16 duration_id;
u8 payload[0];
u8 payload[];
} __packed;
struct rtllib_hdr_1addr {
__le16 frame_ctl;
__le16 duration_id;
u8 addr1[ETH_ALEN];
u8 payload[0];
u8 payload[];
} __packed;
struct rtllib_hdr_2addr {
@ -743,7 +743,7 @@ struct rtllib_hdr_2addr {
__le16 duration_id;
u8 addr1[ETH_ALEN];
u8 addr2[ETH_ALEN];
u8 payload[0];
u8 payload[];
} __packed;
struct rtllib_hdr_3addr {
@ -753,7 +753,7 @@ struct rtllib_hdr_3addr {
u8 addr2[ETH_ALEN];
u8 addr3[ETH_ALEN];
__le16 seq_ctl;
u8 payload[0];
u8 payload[];
} __packed;
struct rtllib_hdr_4addr {
@ -764,7 +764,7 @@ struct rtllib_hdr_4addr {
u8 addr3[ETH_ALEN];
__le16 seq_ctl;
u8 addr4[ETH_ALEN];
u8 payload[0];
u8 payload[];
} __packed;
struct rtllib_hdr_3addrqos {
@ -775,7 +775,7 @@ struct rtllib_hdr_3addrqos {
u8 addr3[ETH_ALEN];
__le16 seq_ctl;
__le16 qos_ctl;
u8 payload[0];
u8 payload[];
} __packed;
struct rtllib_hdr_4addrqos {
@ -787,13 +787,13 @@ struct rtllib_hdr_4addrqos {
__le16 seq_ctl;
u8 addr4[ETH_ALEN];
__le16 qos_ctl;
u8 payload[0];
u8 payload[];
} __packed;
struct rtllib_info_element {
u8 id;
u8 len;
u8 data[0];
u8 data[];
} __packed;
struct rtllib_authentication {
@ -802,7 +802,7 @@ struct rtllib_authentication {
__le16 transaction;
__le16 status;
/*challenge*/
struct rtllib_info_element info_element[0];
struct rtllib_info_element info_element[];
} __packed;
struct rtllib_disauth {
@ -818,7 +818,7 @@ struct rtllib_disassoc {
struct rtllib_probe_request {
struct rtllib_hdr_3addr header;
/* SSID, supported rates */
struct rtllib_info_element info_element[0];
struct rtllib_info_element info_element[];
} __packed;
struct rtllib_probe_response {
@ -829,7 +829,7 @@ struct rtllib_probe_response {
/* SSID, supported rates, FH params, DS params,
* CF params, IBSS params, TIM (if beacon), RSN
*/
struct rtllib_info_element info_element[0];
struct rtllib_info_element info_element[];
} __packed;
/* Alias beacon for probe_response */
@ -840,7 +840,7 @@ struct rtllib_assoc_request_frame {
__le16 capability;
__le16 listen_interval;
/* SSID, supported rates, RSN */
struct rtllib_info_element info_element[0];
struct rtllib_info_element info_element[];
} __packed;
struct rtllib_assoc_response_frame {
@ -848,7 +848,7 @@ struct rtllib_assoc_response_frame {
__le16 capability;
__le16 status;
__le16 aid;
struct rtllib_info_element info_element[0]; /* supported rates */
struct rtllib_info_element info_element[]; /* supported rates */
} __packed;
struct rtllib_txb {
@ -859,7 +859,7 @@ struct rtllib_txb {
u16 reserved;
__le16 frag_size;
__le16 payload_size;
struct sk_buff *fragments[0];
struct sk_buff *fragments[];
};
#define MAX_SUBFRAME_COUNT 64
@ -1792,7 +1792,7 @@ struct rtllib_device {
/* This must be the last item so that it points to the data
* allocated beyond this structure by alloc_rtllib
*/
u8 priv[0];
u8 priv[];
};
#define IEEE_A (1<<0)

28
drivers/staging/rtl8192u/ieee80211/ieee80211.h
View file

@ -886,14 +886,14 @@ enum ieee80211_mfie {
struct rtl_80211_hdr {
__le16 frame_ctl;
__le16 duration_id;
u8 payload[0];
u8 payload[];
} __packed;
struct rtl_80211_hdr_1addr {
__le16 frame_ctl;
__le16 duration_id;
u8 addr1[ETH_ALEN];
u8 payload[0];
u8 payload[];
} __packed;
struct rtl_80211_hdr_2addr {
@ -901,7 +901,7 @@ struct rtl_80211_hdr_2addr {
__le16 duration_id;
u8 addr1[ETH_ALEN];
u8 addr2[ETH_ALEN];
u8 payload[0];
u8 payload[];
} __packed;
struct rtl_80211_hdr_3addr {
@ -911,7 +911,7 @@ struct rtl_80211_hdr_3addr {
u8 addr2[ETH_ALEN];
u8 addr3[ETH_ALEN];
__le16 seq_ctl;
u8 payload[0];
u8 payload[];
} __packed;
struct rtl_80211_hdr_4addr {
@ -922,7 +922,7 @@ struct rtl_80211_hdr_4addr {
u8 addr3[ETH_ALEN];
__le16 seq_ctl;
u8 addr4[ETH_ALEN];
u8 payload[0];
u8 payload[];
} __packed;
struct rtl_80211_hdr_3addrqos {
@ -951,7 +951,7 @@ struct rtl_80211_hdr_4addrqos {
struct ieee80211_info_element {
u8 id;
u8 len;
u8 data[0];
u8 data[];
} __packed;
struct ieee80211_authentication {
@ -960,7 +960,7 @@ struct ieee80211_authentication {
__le16 transaction;
__le16 status;
/*challenge*/
struct ieee80211_info_element info_element[0];
struct ieee80211_info_element info_element[];
} __packed;
struct ieee80211_disassoc {
@ -971,7 +971,7 @@ struct ieee80211_disassoc {
struct ieee80211_probe_request {
struct rtl_80211_hdr_3addr header;
/* SSID, supported rates */
struct ieee80211_info_element info_element[0];
struct ieee80211_info_element info_element[];
} __packed;
struct ieee80211_probe_response {
@ -982,7 +982,7 @@ struct ieee80211_probe_response {
/* SSID, supported rates, FH params, DS params,
* CF params, IBSS params, TIM (if beacon), RSN
*/
struct ieee80211_info_element info_element[0];
struct ieee80211_info_element info_element[];
} __packed;
/* Alias beacon for probe_response */
@ -993,7 +993,7 @@ struct ieee80211_assoc_request_frame {
__le16 capability;
__le16 listen_interval;
/* SSID, supported rates, RSN */
struct ieee80211_info_element info_element[0];
struct ieee80211_info_element info_element[];
} __packed;
struct ieee80211_reassoc_request_frame {
@ -1002,7 +1002,7 @@ struct ieee80211_reassoc_request_frame {
__le16 listen_interval;
u8 current_ap[ETH_ALEN];
/* SSID, supported rates, RSN */
struct ieee80211_info_element info_element[0];
struct ieee80211_info_element info_element[];
} __packed;
struct ieee80211_assoc_response_frame {
@ -1010,7 +1010,7 @@ struct ieee80211_assoc_response_frame {
__le16 capability;
__le16 status;
__le16 aid;
struct ieee80211_info_element info_element[0]; /* supported rates */
struct ieee80211_info_element info_element[]; /* supported rates */
} __packed;
struct ieee80211_txb {
@ -1021,7 +1021,7 @@ struct ieee80211_txb {
u16 reserved;
__le16 frag_size;
__le16 payload_size;
struct sk_buff *fragments[0];
struct sk_buff *fragments[];
};
#define MAX_TX_AGG_COUNT 16
@ -2007,7 +2007,7 @@ struct ieee80211_device {
/* This must be the last item so that it points to the data
* allocated beyond this structure by alloc_ieee80211
*/
u8 priv[0];
u8 priv[];
};
#define IEEE_A (1<<0)

4
drivers/staging/rtl8712/ieee80211.h
View file

@ -535,7 +535,7 @@ struct ieee80211_info_element_hdr {
struct ieee80211_info_element {
u8 id;
u8 len;
u8 data[0];
u8 data[];
} __packed;
/*
@ -597,7 +597,7 @@ struct ieee80211_txb {
u16 reserved;
u16 frag_size;
u16 payload_size;
struct sk_buff *fragments[0];
struct sk_buff *fragments[];
};
/* SWEEP TABLE ENTRIES NUMBER*/

4
drivers/staging/rtl8712/rtl871x_mp_ioctl.h
View file

@ -48,7 +48,7 @@ struct eeprom_rw_param {
struct EFUSE_ACCESS_STRUCT {
u16 start_addr;
u16 cnts;
u8 data[0];
u8 data[];
};
struct burst_rw_reg {
@ -324,7 +324,7 @@ struct mp_ioctl_handler {
struct mp_ioctl_param {
unsigned int subcode;
unsigned int len;
unsigned char data[0];
unsigned char data[];
};
#define GEN_MP_IOCTL_SUBCODE(code) _MP_IOCTL_ ## code ## _CMD_

10
drivers/staging/wilc1000/cfg80211.c
View file

@ -62,7 +62,7 @@ struct wilc_p2p_pub_act_frame {
u8 oui_type;
u8 oui_subtype;
u8 dialog_token;
u8 elem[0];
u8 elem[];
} __packed;
struct wilc_vendor_specific_ie {
@ -70,13 +70,13 @@ struct wilc_vendor_specific_ie {
u8 tag_len;
u8 oui[3];
u8 oui_type;
u8 attr[0];
u8 attr[];
} __packed;
struct wilc_attr_entry {
u8 attr_type;
__le16 attr_len;
u8 val[0];
u8 val[];
} __packed;
struct wilc_attr_oper_ch {
@ -91,13 +91,13 @@ struct wilc_attr_ch_list {
u8 attr_type;
__le16 attr_len;
u8 country_code[IEEE80211_COUNTRY_STRING_LEN];
u8 elem[0];
u8 elem[];
} __packed;
struct wilc_ch_list_elem {
u8 op_class;
u8 no_of_channels;
u8 ch_list[0];
u8 ch_list[];
} __packed;
static void cfg_scan_result(enum scan_event scan_event,

2
drivers/staging/wilc1000/spi.c
View file

@ -139,7 +139,7 @@ struct wilc_spi_read_rsp_data {
u8 status;
u8 resp_header;
u8 resp_data[4];
u8 crc[0];
u8 crc[];
} __packed;
struct wilc_spi_rsp_data {

4
drivers/staging/wlan-ng/hfa384x.h
View file

@ -355,7 +355,7 @@
/* Commonly used basic types */
struct hfa384x_bytestr {
__le16 len;
u8 data[0];
u8 data[];
} __packed;
struct hfa384x_bytestr32 {
@ -421,7 +421,7 @@ struct hfa384x_authenticate_station_data {
/*-- Configuration Record: WPAData (data portion only) --*/
struct hfa384x_wpa_data {
__le16 datalen;
u8 data[0]; /* max 80 */
u8 data[]; /* max 80 */
} __packed;
/*--------------------------------------------------------------------

4
drivers/staging/wlan-ng/p80211types.h
View file

@ -204,7 +204,7 @@ struct p80211pstr {
struct p80211pstrd {
u8 len;
u8 data[0];
u8 data[];
} __packed;
/* Maximum pascal string */
@ -249,7 +249,7 @@ struct p80211itemd {
u32 did;
u16 status;
u16 len;
u8 data[0];
u8 data[];
} __packed;
/* message data item for int, BOUNDEDINT, ENUMINT */