ath6kl: wmi: Replace one-element array with flexible-array member in struct wmi_begin...

Replace one-element array with flexible-array member in struct
wmi_begin_scan_cmd. Also, make use of the struct_size() helper.

This issue was found with the help of Coccinelle and audited and fixed,
manually.

Link: https://www.kernel.org/doc/html/v5.16/process/deprecated.html#zero-length-and-one-element-arrays
Link: https://github.com/KSPP/linux/issues/79
Reviewed-by: Jeff Johnson <quic_jjohnson@quicinc.com>
Signed-off-by: Gustavo A. R. Silva <gustavoars@kernel.org>
Signed-off-by: Kalle Valo <quic_kvalo@quicinc.com>
Link: https://lore.kernel.org/r/1ef801ea24475501fa0f296cb5435a440135206e.1645736204.git.gustavoars@kernel.org

diff --git a/drivers/net/wireless/ath/ath6kl/wmi.c b/drivers/net/wireless/ath/ath6kl/wmi.c
index bd1ef63..e1c9500 100644 (file)
--- a/drivers/net/wireless/ath/ath6kl/wmi.c
+++ b/drivers/net/wireless/ath/ath6kl/wmi.c
@@ -2008,7 +2008,7 @@ int ath6kl_wmi_beginscan_cmd(struct wmi *wmi, u8 if_idx,
        struct ieee80211_supported_band *sband;
        struct sk_buff *skb;
        struct wmi_begin_scan_cmd *sc;
-       s8 size, *supp_rates;
+       s8 *supp_rates;
        int i, band, ret;
        struct ath6kl *ar = wmi->parent_dev;
        int num_rates;
@@ -2023,18 +2023,13 @@ int ath6kl_wmi_beginscan_cmd(struct wmi *wmi, u8 if_idx,
                                                num_chan, ch_list);
        }
 
-       size = sizeof(struct wmi_begin_scan_cmd);
-
        if ((scan_type != WMI_LONG_SCAN) && (scan_type != WMI_SHORT_SCAN))
                return -EINVAL;
 
        if (num_chan > WMI_MAX_CHANNELS)
                return -EINVAL;
 
-       if (num_chan)
-               size += sizeof(u16) * (num_chan - 1);
-
-       skb = ath6kl_wmi_get_new_buf(size);
+       skb = ath6kl_wmi_get_new_buf(struct_size(sc, ch_list, num_chan));
        if (!skb)
                return -ENOMEM;
 

diff --git a/drivers/net/wireless/ath/ath6kl/wmi.h b/drivers/net/wireless/ath/ath6kl/wmi.h
index 8535784..ed84604 100644 (file)
--- a/drivers/net/wireless/ath/ath6kl/wmi.h
+++ b/drivers/net/wireless/ath/ath6kl/wmi.h
@@ -863,7 +863,7 @@ struct wmi_begin_scan_cmd {
        u8 num_ch;
 
        /* channels in Mhz */
-       __le16 ch_list[1];
+       __le16 ch_list[];
 } __packed;
 
 /* wmi_start_scan_cmd is to be deprecated. Use