crypto: hisilicon/qm - annotate cap_tables with __counted_by_ptr

Annotate the 'qm_cap_table' and 'dev_cap_table' pointer fields in
'struct hisi_qm_cap_tables' with the '__counted_by_ptr' attribute.
This improves bounds checking via CONFIG_UBSAN_BOUNDS and
CONFIG_FORTIFY_SOURCE, allowing KASAN and compiler diagnostics to
detect out-of-bounds accesses.

The 'qm_cap_table' pointer is associated with 'qm_cap_size' which
specifies its element count. Similarly, 'dev_cap_table' is associated
with 'dev_cap_size'.

To ensure safety under compiler instrumentation, the assignments in the
initialization paths have been updated to set the 'size'/'count' fields
prior to setting the pointer fields. This prevents any transient state
where the pointer is valid but the count is 0 (or uninitialized),
ensuring that subsequent accesses to these tables do not trigger
false-positive bounds check panics.

Cc: codemender-patching+linux@google.com
Assisted-by: LLM
Signed-off-by: Bill Wendling <morbo@google.com>
Reviewed-by: Gustavo A. R. Silva <gustavoars@kernel.org>
Reviewed-by: Longfang Liu <liulongfang@huawei.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

1 files changed, 2 insertions, 2 deletions

diff --git a/include/linux/hisi_acc_qm.h b/include/linux/hisi_acc_qm.h
index f7570a409905..8dc49fa2123b 100644
--- a/include/linux/hisi_acc_qm.h
+++ b/include/linux/hisi_acc_qm.h
@@ -332,9 +332,9 @@ struct hisi_qm_cap_record {
 
 struct hisi_qm_cap_tables {
 	u32 qm_cap_size;
-	struct hisi_qm_cap_record *qm_cap_table;
+	struct hisi_qm_cap_record *qm_cap_table __counted_by_ptr(qm_cap_size);
 	u32 dev_cap_size;
-	struct hisi_qm_cap_record *dev_cap_table;
+	struct hisi_qm_cap_record *dev_cap_table __counted_by_ptr(dev_cap_size);
 };
 
 struct hisi_qm_list {