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 checking via CONFIG_UBSAN_BOUNDS (for array indexing) and CONFIG_FORTIFY_SOURCE (for strcpy/memcpy-family functions). As found with Coccinelle[1], add __counted_by for struct hwc_dma_buf. [1] https://github.com/kees/kernel-tools/blob/trunk/coccinelle/examples/counted_by.cocci Cc: Long Li <longli@xxxxxxxxxxxxx> Cc: Ajay Sharma <sharmaajay@xxxxxxxxxxxxx> Cc: "K. Y. Srinivasan" <kys@xxxxxxxxxxxxx> Cc: Haiyang Zhang <haiyangz@xxxxxxxxxxxxx> Cc: Wei Liu <wei.liu@xxxxxxxxxx> Cc: Dexuan Cui <decui@xxxxxxxxxxxxx> Cc: "David S. Miller" <davem@xxxxxxxxxxxxx> Cc: Eric Dumazet <edumazet@xxxxxxxxxx> Cc: Jakub Kicinski <kuba@xxxxxxxxxx> Cc: Paolo Abeni <pabeni@xxxxxxxxxx> Cc: linux-rdma@xxxxxxxxxxxxxxx Cc: linux-hyperv@xxxxxxxxxxxxxxx Cc: netdev@xxxxxxxxxxxxxxx Signed-off-by: Kees Cook <keescook@xxxxxxxxxxxx> --- include/net/mana/hw_channel.h | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/include/net/mana/hw_channel.h b/include/net/mana/hw_channel.h index 3d3b5c881bc1..158b125692c2 100644 --- a/include/net/mana/hw_channel.h +++ b/include/net/mana/hw_channel.h @@ -121,7 +121,7 @@ struct hwc_dma_buf { u32 gpa_mkey; u32 num_reqs; - struct hwc_work_request reqs[]; + struct hwc_work_request reqs[] __counted_by(num_reqs); }; typedef void hwc_rx_event_handler_t(void *ctx, u32 gdma_rxq_id, -- 2.34.1
