| Message ID | 20240722033332.6273-1-quic_bqiang@quicinc.com |
|---|---|
| State | New |
| Headers | show |
| Series | wifi: ath12k: fix reusing outside iterator in ath12k_wow_vif_set_wakeups() | expand |
On 7/21/2024 8:33 PM, Baochen Qiang wrote: > Smatch throws below warning: > > drivers/net/wireless/ath/ath12k/wow.c:434 ath12k_wow_vif_set_wakeups() > warn: reusing outside iterator: 'i' > > drivers/net/wireless/ath/ath12k/wow.c > 411 default: > 412 break; > 413 } > 414 > 415 for (i = 0; i < wowlan->n_patterns; i++) { > ^^^^^^^^^^^^^^^^^^^^^^ > Here we loop until ->n_patterns > > 416 const struct cfg80211_pkt_pattern *eth_pattern = &patterns[i]; > 417 struct ath12k_pkt_pattern new_pattern = {}; > 418 > 419 if (WARN_ON(eth_pattern->pattern_len > WOW_MAX_PATTERN_SIZE)) > 420 return -EINVAL; > 421 > 422 if (ar->ab->wow.wmi_conf_rx_decap_mode == > 423 ATH12K_HW_TXRX_NATIVE_WIFI) { > 424 ath12k_wow_convert_8023_to_80211(ar, eth_pattern, > 425 &new_pattern); > 426 > 427 if (WARN_ON(new_pattern.pattern_len > WOW_MAX_PATTERN_SIZE)) > 428 return -EINVAL; > 429 } else { > 430 memcpy(new_pattern.pattern, eth_pattern->pattern, > 431 eth_pattern->pattern_len); > 432 > 433 /* convert bitmask to bytemask */ > --> 434 for (i = 0; i < eth_pattern->pattern_len; i++) > 435 if (eth_pattern->mask[i / 8] & BIT(i % 8)) > 436 new_pattern.bytemask[i] = 0xff; > > This loop re-uses i and the loop ends with i == eth_pattern->pattern_len. > This looks like a bug. > > Change to use a new iterator 'j' for the inner loop to fix it. > > Tested-on: WCN7850 hw2.0 PCI WLAN.HMT.1.0-03427-QCAHMTSWPL_V1.0_V2.0_SILICONZ-1.15378.4 > > Fixes: 4a3c212eee0e ("wifi: ath12k: add basic WoW functionalities") > Reported-by: Dan Carpenter <dan.carpenter@linaro.org> > Closes: https://lore.kernel.org/all/d4975b95-9c43-45af-a0ab-80253f18c7f2@stanley.mountain/ > Signed-off-by: Baochen Qiang <quic_bqiang@quicinc.com> Acked-by: Jeff Johnson <quic_jjohnson@quicinc.com>
diff --git a/drivers/net/wireless/ath/ath12k/wow.c b/drivers/net/wireless/ath/ath12k/wow.c index c5cba825a84a..027f036eb415 100644 --- a/drivers/net/wireless/ath/ath12k/wow.c +++ b/drivers/net/wireless/ath/ath12k/wow.c @@ -361,7 +361,7 @@ static int ath12k_wow_vif_set_wakeups(struct ath12k_vif *arvif, struct ath12k *ar = arvif->ar; unsigned long wow_mask = 0; int pattern_id = 0; - int ret, i; + int ret, i, j; /* Setup requested WOW features */ switch (arvif->vdev_type) { @@ -431,9 +431,9 @@ static int ath12k_wow_vif_set_wakeups(struct ath12k_vif *arvif, eth_pattern->pattern_len); /* convert bitmask to bytemask */ - for (i = 0; i < eth_pattern->pattern_len; i++) - if (eth_pattern->mask[i / 8] & BIT(i % 8)) - new_pattern.bytemask[i] = 0xff; + for (j = 0; j < eth_pattern->pattern_len; j++) + if (eth_pattern->mask[j / 8] & BIT(j % 8)) + new_pattern.bytemask[j] = 0xff; new_pattern.pattern_len = eth_pattern->pattern_len; new_pattern.pkt_offset = eth_pattern->pkt_offset;
Smatch throws below warning: drivers/net/wireless/ath/ath12k/wow.c:434 ath12k_wow_vif_set_wakeups() warn: reusing outside iterator: 'i' drivers/net/wireless/ath/ath12k/wow.c 411 default: 412 break; 413 } 414 415 for (i = 0; i < wowlan->n_patterns; i++) { ^^^^^^^^^^^^^^^^^^^^^^ Here we loop until ->n_patterns 416 const struct cfg80211_pkt_pattern *eth_pattern = &patterns[i]; 417 struct ath12k_pkt_pattern new_pattern = {}; 418 419 if (WARN_ON(eth_pattern->pattern_len > WOW_MAX_PATTERN_SIZE)) 420 return -EINVAL; 421 422 if (ar->ab->wow.wmi_conf_rx_decap_mode == 423 ATH12K_HW_TXRX_NATIVE_WIFI) { 424 ath12k_wow_convert_8023_to_80211(ar, eth_pattern, 425 &new_pattern); 426 427 if (WARN_ON(new_pattern.pattern_len > WOW_MAX_PATTERN_SIZE)) 428 return -EINVAL; 429 } else { 430 memcpy(new_pattern.pattern, eth_pattern->pattern, 431 eth_pattern->pattern_len); 432 433 /* convert bitmask to bytemask */ --> 434 for (i = 0; i < eth_pattern->pattern_len; i++) 435 if (eth_pattern->mask[i / 8] & BIT(i % 8)) 436 new_pattern.bytemask[i] = 0xff; This loop re-uses i and the loop ends with i == eth_pattern->pattern_len. This looks like a bug. Change to use a new iterator 'j' for the inner loop to fix it. Tested-on: WCN7850 hw2.0 PCI WLAN.HMT.1.0-03427-QCAHMTSWPL_V1.0_V2.0_SILICONZ-1.15378.4 Fixes: 4a3c212eee0e ("wifi: ath12k: add basic WoW functionalities") Reported-by: Dan Carpenter <dan.carpenter@linaro.org> Closes: https://lore.kernel.org/all/d4975b95-9c43-45af-a0ab-80253f18c7f2@stanley.mountain/ Signed-off-by: Baochen Qiang <quic_bqiang@quicinc.com> --- drivers/net/wireless/ath/ath12k/wow.c | 8 ++++---- 1 file changed, 4 insertions(+), 4 deletions(-) base-commit: db1ce56e6e1d395dd42a3cd6332a871d9be59c45