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rndis_wlan: Replace zero-length array with flexible-array

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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]

sizeof(flexible-array-member) triggers a warning because flexible array
members have incomplete type[1]. There are some instances of code in
which the sizeof operator is being incorrectly/erroneously applied to
zero-length arrays and the result is zero. Such instances may be hiding
some bugs. So, this work (flexible-array member conversions) will also
help to get completely rid of those sorts of issues.

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 <gustavoars@kernel.org>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>
Link: https://lore.kernel.org/r/20200507192647.GA16710@embeddedor
This commit is contained in:
Gustavo A. R. Silva 2020-05-07 14:26:47 -05:00 committed by Kalle Valo
parent 55bb8a2b01
commit bd7db3021a
1 changed files with 4 additions and 4 deletions
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8
drivers/net/wireless/rndis_wlan.c
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@ -201,7 +201,7 @@ struct ndis_80211_pmkid_candidate {
struct ndis_80211_pmkid_cand_list {
__le32 version;
__le32 num_candidates;
struct ndis_80211_pmkid_candidate candidate_list[0];
struct ndis_80211_pmkid_candidate candidate_list[];
} __packed;
struct ndis_80211_status_indication {
@ -246,12 +246,12 @@ struct ndis_80211_bssid_ex {
__le32 net_infra;
u8 rates[NDIS_802_11_LENGTH_RATES_EX];
__le32 ie_length;
u8 ies[0];
u8 ies[];
} __packed;
struct ndis_80211_bssid_list_ex {
__le32 num_items;
struct ndis_80211_bssid_ex bssid[0];
struct ndis_80211_bssid_ex bssid[];
} __packed;
struct ndis_80211_fixed_ies {
@ -327,7 +327,7 @@ struct ndis_80211_bssid_info {
struct ndis_80211_pmkid {
__le32 length;
__le32 bssid_info_count;
struct ndis_80211_bssid_info bssid_info[0];
struct ndis_80211_bssid_info bssid_info[];
} __packed;
/*