As part of the work to perform bounds checking on all memcpy() uses, replace the open-coded a deserialization of bytes out of memory into a trailing flexible array by using a flex_array.h helper to perform the allocation, bounds checking, and copying.
Cc: Arend van Spriel <aspr...@gmail.com> Cc: Franky Lin <franky....@broadcom.com> Cc: Hante Meuleman <hante.meule...@broadcom.com> Cc: Kalle Valo <kv...@kernel.org> Cc: "David S. Miller" <da...@davemloft.net> Cc: Eric Dumazet <eduma...@google.com> Cc: Jakub Kicinski <k...@kernel.org> Cc: Paolo Abeni <pab...@redhat.com> Cc: linux-wirel...@vger.kernel.org Cc: brcm80211-dev-list....@broadcom.com Cc: sha-cyfmac-dev-l...@infineon.com Cc: net...@vger.kernel.org Signed-off-by: Kees Cook <keesc...@chromium.org> --- .../net/wireless/broadcom/brcm80211/brcmfmac/fweh.c | 11 ++++------- 1 file changed, 4 insertions(+), 7 deletions(-) diff --git a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/fweh.c b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/fweh.c index bc3f4e4edcdf..bea798ca6466 100644 --- a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/fweh.c +++ b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/fweh.c @@ -32,8 +32,8 @@ struct brcmf_fweh_queue_item { u8 ifidx; u8 ifaddr[ETH_ALEN]; struct brcmf_event_msg_be emsg; - u32 datalen; - u8 data[]; + DECLARE_FLEX_ARRAY_ELEMENTS_COUNT(u32, datalen); + DECLARE_FLEX_ARRAY_ELEMENTS(u8, data); }; /* @@ -395,7 +395,7 @@ void brcmf_fweh_process_event(struct brcmf_pub *drvr, { enum brcmf_fweh_event_code code; struct brcmf_fweh_info *fweh = &drvr->fweh; - struct brcmf_fweh_queue_item *event; + struct brcmf_fweh_queue_item *event = NULL; void *data; u32 datalen; @@ -414,8 +414,7 @@ void brcmf_fweh_process_event(struct brcmf_pub *drvr, datalen + sizeof(*event_packet) > packet_len) return; - event = kzalloc(sizeof(*event) + datalen, gfp); - if (!event) + if (mem_to_flex_dup(&event, data, datalen, gfp)) return; event->code = code; @@ -423,8 +422,6 @@ void brcmf_fweh_process_event(struct brcmf_pub *drvr, /* use memcpy to get aligned event message */ memcpy(&event->emsg, &event_packet->msg, sizeof(event->emsg)); - memcpy(event->data, data, datalen); - event->datalen = datalen; memcpy(event->ifaddr, event_packet->eth.h_dest, ETH_ALEN); brcmf_fweh_queue_event(fweh, event); -- 2.32.0