On Tue, Sep 17, 2024 at 06:08:41PM +0300, Alper Nebi Yasak wrote: > Replace one-element array with a flexible-array member in `struct > mwifiex_ie_types_wildcard_ssid_params` to fix the following warning > on a MT8173 Chromebook (mt8173-elm-hana): > > [ 356.775250] ------------[ cut here ]------------ > [ 356.784543] memcpy: detected field-spanning write (size 6) of single field "wildcard_ssid_tlv->ssid" at drivers/net/wireless/marvell/mwifiex/scan.c:904 (size 1) > [ 356.813403] WARNING: CPU: 3 PID: 742 at drivers/net/wireless/marvell/mwifiex/scan.c:904 mwifiex_scan_networks+0x4fc/0xf28 [mwifiex] > > The "(size 6)" above is exactly the length of the SSID of the network > this device was connected to. The source of the warning looks like: > > ssid_len = user_scan_in->ssid_list[i].ssid_len; > [...] > memcpy(wildcard_ssid_tlv->ssid, > user_scan_in->ssid_list[i].ssid, ssid_len); > > Also adjust a #define that uses sizeof() on this struct to keep the > value same as before. ... > #define WILDCARD_SSID_TLV_MAX_SIZE \ > (MWIFIEX_MAX_SSID_LIST_LENGTH * \ > (sizeof(struct mwifiex_ie_types_wildcard_ssid_params) \ > - + IEEE80211_MAX_SSID_LEN)) > + + IEEE80211_MAX_SSID_LEN + 1)) > This hunk has to be carefully checked by wireless people. I'm not sure that we need + 1 here. Otherwise, LGTM. -- With Best Regards, Andy Shevchenko
