[PATCH v2 04/34] net/ntnic: add array index verification

[Serhii Iliushyk <sil-plv@napatech.com>]

From: Danylo Vodopianov <dvo-plv@napatech.com>

CI found couple coverity problems which were fixed in this commit.

CID: 448983, 448980
Memory - corruptions  (OVERRUN)

Add check both indices within bounds before calling the macro

Coverity issue: 448983
Fixes: 6e8b7f11205f ("net/ntnic: add categorizer (CAT) FPGA module")

Signed-off-by: Danylo Vodopianov <dvo-plv@napatech.com>
---
 .../ntnic/nthw/flow_api/hw_mod/hw_mod_hsh.c    | 17 ++++++++++++++++-
 .../ntnic/nthw/flow_api/hw_mod/hw_mod_pdb.c    | 18 ++++++++++++++++--
 2 files changed, 32 insertions(+), 3 deletions(-)

diff --git a/drivers/net/ntnic/nthw/flow_api/hw_mod/hw_mod_hsh.c b/drivers/net/ntnic/nthw/flow_api/hw_mod/hw_mod_hsh.c
index 1750d09afb..cc8db2fae5 100644
--- a/drivers/net/ntnic/nthw/flow_api/hw_mod/hw_mod_hsh.c
+++ b/drivers/net/ntnic/nthw/flow_api/hw_mod/hw_mod_hsh.c
@@ -121,8 +121,23 @@ static int hw_mod_hsh_rcp_mod(struct flow_api_backend_s *be, enum hw_hsh_e field
 				INDEX_TOO_LARGE_LOG;
 				return INDEX_TOO_LARGE;
 			}
+			/* Size of the structure */
+			size_t element_size = sizeof(struct hsh_v5_rcp_s);
+			/* Size of the buffer */
+			size_t buffer_size = sizeof(be->hsh.v5.rcp);
 
-			DO_COMPARE_INDEXS(be->hsh.v5.rcp, struct hsh_v5_rcp_s, index, word_off);
+			/* Calculate the maximum valid index (number of elements in the buffer) */
+			size_t max_idx = buffer_size / element_size;
+
+			/* Check that both indices are within bounds before calling the macro */
+			if (index < max_idx && word_off < max_idx) {
+				DO_COMPARE_INDEXS(be->hsh.v5.rcp, struct hsh_v5_rcp_s, index,
+					word_off);
+
+			} else {
+				INDEX_TOO_LARGE_LOG;
+				return INDEX_TOO_LARGE;
+			}
 			break;
 
 		case HW_HSH_RCP_FIND:
diff --git a/drivers/net/ntnic/nthw/flow_api/hw_mod/hw_mod_pdb.c b/drivers/net/ntnic/nthw/flow_api/hw_mod/hw_mod_pdb.c
index 59285405ba..147a06ac2b 100644
--- a/drivers/net/ntnic/nthw/flow_api/hw_mod/hw_mod_pdb.c
+++ b/drivers/net/ntnic/nthw/flow_api/hw_mod/hw_mod_pdb.c
@@ -131,8 +131,22 @@ static int hw_mod_pdb_rcp_mod(struct flow_api_backend_s *be, enum hw_pdb_e field
 				INDEX_TOO_LARGE_LOG;
 				return INDEX_TOO_LARGE;
 			}
-
-			DO_COMPARE_INDEXS(be->pdb.v9.rcp, struct pdb_v9_rcp_s, index, *value);
+			/* Size of the structure */
+			size_t element_size = sizeof(struct pdb_v9_rcp_s);
+			/* Size of the buffer */
+			size_t buffer_size = sizeof(be->pdb.v9.rcp);
+
+			/* Calculate the maximum valid index (number of elements in the buffer) */
+			size_t max_idx = buffer_size / element_size;
+
+			/* Check that both indices are within bounds before calling the macro */
+			if (index < max_idx && *value < max_idx) {
+				DO_COMPARE_INDEXS(be->pdb.v9.rcp, struct pdb_v9_rcp_s, index,
+					*value);
+			} else {
+				INDEX_TOO_LARGE_LOG;
+				return INDEX_TOO_LARGE;
+			}
 			break;
 
 		case HW_PDB_RCP_DESCRIPTOR:
-- 
2.45.0