wifi: wcn36xx: fix channel survey memory allocation size

KASAN reported a memory allocation issue in wcn->chan_survey
due to incorrect size calculation.
This commit uses kcalloc to allocate memory for wcn->chan_survey,
ensuring proper initialization and preventing the use of uninitialized
values when there are no frames on the channel.

Fixes: 29696e0aa413 ("wcn36xx: Track SNR and RSSI for each RX frame")
Signed-off-by: Barnabás Czémán <barnabas.czeman@mainlining.org>
Acked-by: Loic Poulain <loic.poulain@linaro.org>
Reviewed-by: Bryan O'Donoghue <bryan.odonoghue@linaro.org>
Link: https://patch.msgid.link/20241104-wcn36xx-memory-allocation-v1-1-5ec901cf37b6@mainlining.org
Signed-off-by: Jeff Johnson <quic_jjohnson@quicinc.com>

diff --git a/drivers/net/wireless/ath/wcn36xx/main.c b/drivers/net/wireless/ath/wcn36xx/main.c
index 408776562a7e56da3017aa074396bcd241d62f8c..cd36cab6db75d300f4f6617a6a9e1550f62921c7 100644 (file)
--- a/drivers/net/wireless/ath/wcn36xx/main.c
+++ b/drivers/net/wireless/ath/wcn36xx/main.c
@@ -1590,7 +1590,10 @@ static int wcn36xx_probe(struct platform_device *pdev)
        }
 
        n_channels = wcn_band_2ghz.n_channels + wcn_band_5ghz.n_channels;
-       wcn->chan_survey = devm_kmalloc(wcn->dev, n_channels, GFP_KERNEL);
+       wcn->chan_survey = devm_kcalloc(wcn->dev,
+                                       n_channels,
+                                       sizeof(struct wcn36xx_chan_survey),
+                                       GFP_KERNEL);
        if (!wcn->chan_survey) {
                ret = -ENOMEM;
                goto out_wq;