6.5-stable review patch. If anyone has any objections, please let me know. ------------------ From: Juerg Haefliger <juerg.haefliger@xxxxxxxxxxxxx> commit 4fed494abcd4fde5c24de19160e93814f912fdb3 upstream. Since commit 2d47c6956ab3 ("ubsan: Tighten UBSAN_BOUNDS on GCC"), UBSAN_BOUNDS no longer pretends 1-element arrays are unbounded. Walking 'element' and 'channel_list' will trigger warnings, so make them proper flexible arrays. False positive warnings were: UBSAN: array-index-out-of-bounds in drivers/net/wireless/broadcom/brcm80211/brcmfmac/cfg80211.c:6984:20 index 1 is out of range for type '__le32 [1]' UBSAN: array-index-out-of-bounds in drivers/net/wireless/broadcom/brcm80211/brcmfmac/cfg80211.c:1126:27 index 1 is out of range for type '__le16 [1]' for these lines of code: 6884 ch.chspec = (u16)le32_to_cpu(list->element[i]); 1126 params_le->channel_list[i] = cpu_to_le16(chanspec); Cc: stable@xxxxxxxxxxxxxxx # 6.5+ Signed-off-by: Juerg Haefliger <juerg.haefliger@xxxxxxxxxxxxx> Reviewed-by: Kees Cook <keescook@xxxxxxxxxxxx> Reviewed-by: Gustavo A. R. Silva <gustavoars@xxxxxxxxxx> Signed-off-by: Kalle Valo <kvalo@xxxxxxxxxx> Link: https://lore.kernel.org/r/20230914070227.12028-1-juerg.haefliger@xxxxxxxxxxxxx Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- .../wireless/broadcom/brcm80211/brcmfmac/fwil_types.h | 9 +++++++-- 1 file changed, 7 insertions(+), 2 deletions(-) diff --git a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/fwil_types.h b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/fwil_types.h index bece26741d3a..611d1a6aabb9 100644 --- a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/fwil_types.h +++ b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/fwil_types.h @@ -442,7 +442,12 @@ struct brcmf_scan_params_v2_le { * fixed parameter portion is assumed, otherwise * ssid in the fixed portion is ignored */ - __le16 channel_list[1]; /* list of chanspecs */ + union { + __le16 padding; /* Reserve space for at least 1 entry for abort + * which uses an on stack brcmf_scan_params_v2_le + */ + DECLARE_FLEX_ARRAY(__le16, channel_list); /* chanspecs */ + }; }; struct brcmf_scan_results { @@ -702,7 +707,7 @@ struct brcmf_sta_info_le { struct brcmf_chanspec_list { __le32 count; /* # of entries */ - __le32 element[1]; /* variable length uint32 list */ + __le32 element[]; /* variable length uint32 list */ }; /* -- 2.42.0