[PATCH v3 09/20] common/cnxk: fix cnxk xstats names

[Rahul Bhansali <rbhansali@marvell.com>]

From: Alok Mishra <almishra@marvell.com>

Prevent out of bounds writes when application provides a smaller
xstat name array. Return required count when xstats_names is NULL
or when the provided buffer is too small,

Fixes: 825bd1d9d8e6 ("common/cnxk: update extra stats for inline device")
Cc: stable@dpdk.org

Signed-off-by: Alok Mishra <almishra@marvell.com>
---
Changes in v3: No change.
Changes in v2: No change.

 .mailmap                            |  1 +
 drivers/common/cnxk/roc_nix_stats.c | 46 ++++++++++++++++-------------
 2 files changed, 26 insertions(+), 21 deletions(-)

diff --git a/.mailmap b/.mailmap
index 0e0d83e1c6..efcb38b6bd 100644
--- a/.mailmap
+++ b/.mailmap
@@ -80,6 +80,7 @@ Alin Rauta <alin.rauta@intel.com>
 Allain Legacy <allain.legacy@windriver.com>
 Allen Hubbe <allen.hubbe@amd.com>
 Alok Makhariya <alok.makhariya@nxp.com>
+Alok Mishra <almishra@marvell.com>
 Alok Prasad <palok@marvell.com>
 Alvaro Karsz <alvaro.karsz@solid-run.com>
 Alvin Zhang <alvinx.zhang@intel.com>
diff --git a/drivers/common/cnxk/roc_nix_stats.c b/drivers/common/cnxk/roc_nix_stats.c
index 6f241c72de..ec2aca8164 100644
--- a/drivers/common/cnxk/roc_nix_stats.c
+++ b/drivers/common/cnxk/roc_nix_stats.c
@@ -503,46 +503,51 @@ roc_nix_xstats_names_get(struct roc_nix *roc_nix,
 	struct idev_cfg *idev = idev_get_cfg();
 	uint64_t i, count = 0;

-	PLT_SET_USED(limit);
-
 	for (i = 0; i < CNXK_NIX_NUM_TX_XSTATS; i++) {
-		NIX_XSTATS_NAME_PRINT(xstats_names, count, nix_tx_xstats, i);
+		if (xstats_names && count < limit)
+			NIX_XSTATS_NAME_PRINT(xstats_names, count, nix_tx_xstats, i);
 		count++;
 	}

 	for (i = 0; i < CNXK_NIX_NUM_RX_XSTATS; i++) {
-		NIX_XSTATS_NAME_PRINT(xstats_names, count, nix_rx_xstats, i);
+		if (xstats_names && count < limit)
+			NIX_XSTATS_NAME_PRINT(xstats_names, count, nix_rx_xstats, i);
 		count++;
 	}

 	if (nix->inb_inl_dev && idev) {
 		if (idev->nix_inl_dev) {
 			for (i = 0; i < CNXK_INL_NIX_NUM_RX_XSTATS; i++) {
-				NIX_XSTATS_NAME_PRINT(xstats_names, count,
-						      inl_nix_rx_xstats, i);
+				if (xstats_names && count < limit)
+					NIX_XSTATS_NAME_PRINT(xstats_names, count,
+							      inl_nix_rx_xstats, i);
 				count++;
 			}
 			for (i = 0; i < CNXK_INL_NIX_RQ_XSTATS; i++) {
-				NIX_XSTATS_NAME_PRINT(xstats_names, count,
-						      inl_nix_rq_xstats, i);
+				if (xstats_names && count < limit)
+					NIX_XSTATS_NAME_PRINT(xstats_names, count,
+							      inl_nix_rq_xstats, i);
 				count++;
 			}
 			for (i = 0; i < PLT_DIM(inl_sw_xstats); i++) {
-				NIX_XSTATS_NAME_PRINT(xstats_names, count, inl_sw_xstats, i);
+				if (xstats_names && count < limit)
+					NIX_XSTATS_NAME_PRINT(xstats_names, count, inl_sw_xstats,
+							      i);
 				count++;
 			}
 		}
 	}

 	for (i = 0; i < CNXK_NIX_NUM_QUEUE_XSTATS; i++) {
-		NIX_XSTATS_NAME_PRINT(xstats_names, count, nix_q_xstats, i);
+		if (xstats_names && count < limit)
+			NIX_XSTATS_NAME_PRINT(xstats_names, count, nix_q_xstats, i);
 		count++;
 	}

 	if (roc_model_is_cn10k() || roc_model_is_cn20k()) {
 		for (i = 0; i < CNXK_NIX_NUM_CN10K_RX_XSTATS; i++) {
-			NIX_XSTATS_NAME_PRINT(xstats_names, count,
-					      nix_cn10k_rx_xstats, i);
+			if (xstats_names && count < limit)
+				NIX_XSTATS_NAME_PRINT(xstats_names, count, nix_cn10k_rx_xstats, i);
 			count++;
 		}
 	}
@@ -552,30 +557,29 @@ roc_nix_xstats_names_get(struct roc_nix *roc_nix,

 	if (roc_model_is_cn9k()) {
 		for (i = 0; i < CNXK_NIX_NUM_RX_XSTATS_CGX; i++) {
-			NIX_XSTATS_NAME_PRINT(xstats_names, count,
-					      nix_rx_xstats_cgx, i);
+			if (xstats_names && count < limit)
+				NIX_XSTATS_NAME_PRINT(xstats_names, count, nix_rx_xstats_cgx, i);
 			count++;
 		}

 		for (i = 0; i < CNXK_NIX_NUM_TX_XSTATS_CGX; i++) {
-			NIX_XSTATS_NAME_PRINT(xstats_names, count,
-					      nix_tx_xstats_cgx, i);
+			if (xstats_names && count < limit)
+				NIX_XSTATS_NAME_PRINT(xstats_names, count, nix_tx_xstats_cgx, i);
 			count++;
 		}

 	} else {
 		for (i = 0; i < CNXK_NIX_NUM_RX_XSTATS_RPM; i++) {
-			NIX_XSTATS_NAME_PRINT(xstats_names, count,
-					      nix_rx_xstats_rpm, i);
+			if (xstats_names && count < limit)
+				NIX_XSTATS_NAME_PRINT(xstats_names, count, nix_rx_xstats_rpm, i);
 			count++;
 		}

 		for (i = 0; i < CNXK_NIX_NUM_TX_XSTATS_RPM; i++) {
-			NIX_XSTATS_NAME_PRINT(xstats_names, count,
-					      nix_tx_xstats_rpm, i);
+			if (xstats_names && count < limit)
+				NIX_XSTATS_NAME_PRINT(xstats_names, count, nix_tx_xstats_rpm, i);
 			count++;
 		}
 	}
-
 	return count;
 }
--
2.34.1