From: Jouni Malinen Date: Mon, 11 Feb 2019 14:29:04 +0000 (+0200) Subject: cfg80211: Use const more consistently in for_each_element macros X-Git-Url: https://jxself.org/git/?a=commitdiff_plain;h=63bccab8740ad8c254ec9a44fde250895a399b1c;p=carl9170fw.git cfg80211: Use const more consistently in for_each_element macros Enforce the first argument to be a correct type of a pointer to struct element and avoid unnecessary typecasts from const to non-const pointers (the change in validate_ie_attr() is needed to make this part work). In addition, avoid signed/unsigned comparison within for_each_element() and mark struct element packed just in case. Signed-off-by: Jouni Malinen Signed-off-by: Johannes Berg Signed-off-by: Christian Lamparter --- diff --git a/include/linux/ieee80211.h b/include/linux/ieee80211.h index 4e47319..c2cc9a9 100644 --- a/include/linux/ieee80211.h +++ b/include/linux/ieee80211.h @@ -3214,16 +3214,16 @@ struct element { u8 id; u8 datalen; u8 data[]; -}; +} __packed; /* element iteration helpers */ -#define for_each_element(element, _data, _datalen) \ - for (element = (void *)(_data); \ - (u8 *)(_data) + (_datalen) - (u8 *)element >= \ - sizeof(*element) && \ - (u8 *)(_data) + (_datalen) - (u8 *)element >= \ - sizeof(*element) + element->datalen; \ - element = (void *)(element->data + element->datalen)) +#define for_each_element(_elem, _data, _datalen) \ + for (_elem = (const struct element *)(_data); \ + (const u8 *)(_data) + (_datalen) - (const u8 *)_elem >= \ + (int)sizeof(*_elem) && \ + (const u8 *)(_data) + (_datalen) - (const u8 *)_elem >= \ + (int)sizeof(*_elem) + _elem->datalen; \ + _elem = (const struct element *)(_elem->data + _elem->datalen)) #define for_each_element_id(element, _id, data, datalen) \ for_each_element(element, data, datalen) \ @@ -3260,7 +3260,7 @@ struct element { static inline bool for_each_element_completed(const struct element *element, const void *data, size_t datalen) { - return (u8 *)element == (u8 *)data + datalen; + return (const u8 *)element == (const u8 *)data + datalen; } #endif /* __LINUX_IEEE80211_H */