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 smt_data. [1] https://github.com/kees/kernel-tools/blob/trunk/coccinelle/examples/counted_by.cocci Cc: Raju Rangoju <ra...@chelsio.com> 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: net...@vger.kernel.org Signed-off-by: Kees Cook <keesc...@chromium.org> --- drivers/net/ethernet/chelsio/cxgb4/smt.h | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/net/ethernet/chelsio/cxgb4/smt.h b/drivers/net/ethernet/chelsio/cxgb4/smt.h index 541249d78914..109c1dff563a 100644 --- a/drivers/net/ethernet/chelsio/cxgb4/smt.h +++ b/drivers/net/ethernet/chelsio/cxgb4/smt.h @@ -66,7 +66,7 @@ struct smt_entry { struct smt_data { unsigned int smt_size; rwlock_t lock; - struct smt_entry smtab[]; + struct smt_entry smtab[] __counted_by(smt_size); }; struct smt_data *t4_init_smt(void); -- 2.34.1
