From: Jouni Malinen j@w1.fi
commit 7388afe09143210f555bdd6c75035e9acc1fab96 upstream.
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 j@w1.fi Signed-off-by: Johannes Berg johannes.berg@intel.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org
--- include/linux/ieee80211.h | 18 +++++++++--------- 1 file changed, 9 insertions(+), 9 deletions(-)
--- a/include/linux/ieee80211.h +++ b/include/linux/ieee80211.h @@ -2747,16 +2747,16 @@ 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) \ @@ -2793,7 +2793,7 @@ 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 */