drivers: ethernet: adin2111: reset state when the read packet it too big

Add a bounds check to prevent a chunk from being written outside the
buffer.

Signed-off-by: Michael Zimmermann <michael.zimmermann@sevenlab.de>
(cherry picked from commit 158df8d088316cdae20816fc07703892280b2acb)

drivers/ethernet/eth_adin2111.c

diff --git a/drivers/ethernet/eth_adin2111.c b/drivers/ethernet/eth_adin2111.c
index cb781e1..72fdd4d 100644
--- a/drivers/ethernet/eth_adin2111.c
+++ b/drivers/ethernet/eth_adin2111.c
@@ -310,6 +310,13 @@
 		len = (ftr & ADIN2111_OA_DATA_FTR_EV) ?
 		       ((ftr & ADIN2111_OA_DATA_FTR_EBO_MSK) >> ADIN2111_OA_DATA_FTR_EBO) + 1 :
 		       ctx->oa_cps;
+
+		if (ctx->scur + len > CONFIG_ETH_ADIN2111_BUFFER_SIZE) {
+			ctx->scur = 0;
+			LOG_ERR("OA RX: Frame is larger than maximum size !");
+			goto update_pos;
+		}
+
 		memcpy(&ctx->buf[ctx->scur], &ctx->oa_rx_buf[rx_pos], len);
 		ctx->scur += len;