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author | Gustavo A. R. Silva <gustavoars@kernel.org> | 2023-10-10 00:42:04 +0300 |
---|---|---|
committer | Kalle Valo <kvalo@kernel.org> | 2023-10-11 12:20:58 +0300 |
commit | 62d19b35808816dc2bdf5031e5401230f6a915ba (patch) | |
tree | fbf3ca46bf8eebba77d58460760a1ee84a9c45b4 /drivers/net | |
parent | 5cf47dc14158f979ee9485fc15e004c0d6952ea7 (diff) | |
download | linux-62d19b35808816dc2bdf5031e5401230f6a915ba.tar.xz |
wifi: brcmfmac: fweh: Add __counted_by for struct brcmf_fweh_queue_item and use struct_size()
Prepare for the coming implementation by GCC and Clang of the __counted_by
attribute. Flexible array members annotated with __counted_by can have
their accesses bounds-checked at run-time via CONFIG_UBSAN_BOUNDS (for
array indexing) and CONFIG_FORTIFY_SOURCE (for strcpy/memcpy-family
functions).
Also, relocate `event->datalen = datalen;` to before calling
`memcpy(event->data, data, datalen);`, so that the __counted_by
annotation has effect, and flex-array member `data` can be properly
bounds-checked at run-time.
While there, use struct_size() helper, instead of the open-coded
version, to calculate the size for the allocation of the whole
flexible structure, including of course, the flexible-array member.
This code was found with the help of Coccinelle, and audited and
fixed manually.
Signed-off-by: Gustavo A. R. Silva <gustavoars@kernel.org>
Reviewed-by: Kees Cook <keescook@chromium.org>
Acked-by: Arend van Spriel <arend.vanspriel@broadcom.com>
Signed-off-by: Kalle Valo <kvalo@kernel.org>
Link: https://lore.kernel.org/r/ZSRzrIe0345eymk2@work
Diffstat (limited to 'drivers/net')
-rw-r--r-- | drivers/net/wireless/broadcom/brcm80211/brcmfmac/fweh.c | 6 |
1 files changed, 3 insertions, 3 deletions
diff --git a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/fweh.c b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/fweh.c index dac7eb77799b..68960ae98987 100644 --- a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/fweh.c +++ b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/fweh.c @@ -33,7 +33,7 @@ struct brcmf_fweh_queue_item { u8 ifaddr[ETH_ALEN]; struct brcmf_event_msg_be emsg; u32 datalen; - u8 data[]; + u8 data[] __counted_by(datalen); }; /* @@ -418,17 +418,17 @@ void brcmf_fweh_process_event(struct brcmf_pub *drvr, datalen + sizeof(*event_packet) > packet_len) return; - event = kzalloc(sizeof(*event) + datalen, gfp); + event = kzalloc(struct_size(event, data, datalen), gfp); if (!event) return; + event->datalen = datalen; event->code = code; event->ifidx = event_packet->msg.ifidx; /* 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); |