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From:   gregory.greenman@intel.com
To:     johannes@sipsolutions.net
Cc:     linux-wireless@vger.kernel.org,
        Daniel Gabay <daniel.gabay@intel.com>,
        Gregory Greenman <gregory.greenman@intel.com>
Subject: [PATCH 14/15] wifi: iwlwifi: yoyo: Fix possible division by zero
Date:   Thu, 13 Apr 2023 21:40:34 +0300
Message-Id: <20230413213309.5d6688ed74d8.I5c2f3a882b50698b708d54f4524dc5bdf11e3d32@changeid>
In-Reply-To: <20230413184035.1140892-1-gregory.greenman@intel.com>
References: <20230413184035.1140892-1-gregory.greenman@intel.com>
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From: Daniel Gabay <daniel.gabay@intel.com>

Don't allow buffer allocation TLV with zero req_size since it
leads later to division by zero in iwl_dbg_tlv_alloc_fragments().
Also, NPK/SRAM locations are allowed to have zero buffer req_size,
don't discard them.

Fixes: a9248de42464 ("iwlwifi: dbg_ini: add TLV allocation new API support")
Signed-off-by: Daniel Gabay <daniel.gabay@intel.com>
Signed-off-by: Gregory Greenman <gregory.greenman@intel.com>
---
 drivers/net/wireless/intel/iwlwifi/iwl-dbg-tlv.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/drivers/net/wireless/intel/iwlwifi/iwl-dbg-tlv.c b/drivers/net/wireless/intel/iwlwifi/iwl-dbg-tlv.c
index 87366b70b17f..546737320a57 100644
--- a/drivers/net/wireless/intel/iwlwifi/iwl-dbg-tlv.c
+++ b/drivers/net/wireless/intel/iwlwifi/iwl-dbg-tlv.c
@@ -138,6 +138,12 @@ static int iwl_dbg_tlv_alloc_buf_alloc(struct iwl_trans *trans,
 	    alloc_id != IWL_FW_INI_ALLOCATION_ID_DBGC1)
 		goto err;
 
+	if (buf_location == IWL_FW_INI_LOCATION_DRAM_PATH &&
+	    alloc->req_size == 0) {
+		IWL_ERR(trans, "WRT: Invalid DRAM buffer allocation requested size (0)\n");
+		return -EINVAL;
+	}
+
 	trans->dbg.fw_mon_cfg[alloc_id] = *alloc;
 
 	return 0;
-- 
2.38.1