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Tue, 11 Jun 2024 03:10:37 GMT Received: from hu-aarasahu-blr.qualcomm.com (10.80.80.8) by nasanex01c.na.qualcomm.com (10.45.79.139) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.1544.9; Mon, 10 Jun 2024 20:10:35 -0700 From: Aaradhana Sahu To: CC: , Aaradhana Sahu Subject: [PATCH 1/2] wifi: ath12k: fix NULL pointer access in ath12k_mac_op_get_survey() Date: Tue, 11 Jun 2024 08:40:16 +0530 Message-ID: <20240611031017.297927-2-quic_aarasahu@quicinc.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20240611031017.297927-1-quic_aarasahu@quicinc.com> References: <20240611031017.297927-1-quic_aarasahu@quicinc.com> Precedence: bulk X-Mailing-List: linux-wireless@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-ClientProxiedBy: nasanex01b.na.qualcomm.com (10.46.141.250) To nasanex01c.na.qualcomm.com (10.45.79.139) X-QCInternal: smtphost X-Proofpoint-Virus-Version: vendor=nai engine=6200 definitions=5800 signatures=585085 X-Proofpoint-ORIG-GUID: RtvwAzBidLSv5VaFlUameI8lrYBXDhvn X-Proofpoint-GUID: RtvwAzBidLSv5VaFlUameI8lrYBXDhvn X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1039,Hydra:6.0.680,FMLib:17.12.28.16 definitions=2024-06-10_08,2024-06-10_01,2024-05-17_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 priorityscore=1501 impostorscore=0 lowpriorityscore=0 spamscore=0 malwarescore=0 suspectscore=0 clxscore=1015 bulkscore=0 phishscore=0 adultscore=0 mlxscore=0 mlxlogscore=999 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.19.0-2405170001 definitions=main-2406110024 Smatch throws below error drivers/net/wireless/ath/ath12k/mac.c:8318 ath12k_mac_op_get_survey() error: we previously assumed 'sband' could be null Currently, we access sband inside the null check of the sband in ath12k_mac_op_get_survey(). Fix this issue by removing the entire if block, because decrement idx is unnecessary since there are no more band to test. Tested-on: QCN9274 hw2.0 PCI WLAN.WBE.1.0.1-00029-QCAHKSWPL_SILICONZ-1 Fixes: 70e3be54bbdd ("wifi: ath12k: fix survey dump collection in 6 GHz") Signed-off-by: Aaradhana Sahu --- drivers/net/wireless/ath/ath12k/mac.c | 4 ---- 1 file changed, 4 deletions(-) diff --git a/drivers/net/wireless/ath/ath12k/mac.c b/drivers/net/wireless/ath/ath12k/mac.c index 509c02bffdae..4fea411545bc 100644 --- a/drivers/net/wireless/ath/ath12k/mac.c +++ b/drivers/net/wireless/ath/ath12k/mac.c @@ -8314,10 +8314,6 @@ static int ath12k_mac_op_get_survey(struct ieee80211_hw *hw, int idx, if (!sband) sband = hw->wiphy->bands[NL80211_BAND_6GHZ]; - if (!sband || idx >= sband->n_channels) { - idx -= sband->n_channels; - sband = NULL; - } if (!sband || idx >= sband->n_channels) return -ENOENT;