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authorKalle Valo <quic_kvalo@quicinc.com>2022-10-10 19:06:38 +0300
committerKalle Valo <kvalo@kernel.org>2022-10-11 11:46:31 +0300
commitabf93f369419249ca482a8911039fe1c75a94227 (patch)
tree06561cbd7908add09948839ce6c3acd0682ebeb7 /drivers/net
parent95b0f66649bb04c6c9c15e461ecf9522efe9555c (diff)
downloadlinux-abf93f369419249ca482a8911039fe1c75a94227.tar.xz
wifi: ath11k: mac: fix reading 16 bytes from a region of size 0 warning
Linaro reported stringop-overread warnings in ath11k (this is one of many): drivers/net/wireless/ath/ath11k/mac.c:2238:29: error: 'ath11k_peer_assoc_h_he_limit' reading 16 bytes from a region of size 0 [-Werror=stringop-overread] My further investigation showed that these warnings happen on GCC 11.3 but not with GCC 12.2, and with only the kernel config Linaro provided: https://builds.tuxbuild.com/2F4W7nZHNx3T88RB0gaCZ9hBX6c/config I saw the same warnings both with arm64 and x86_64 builds and KASAN seems to be the reason triggering these warnings with GCC 11. Nobody else has reported this so this seems to be quite rare corner case. I don't know what specific commit started emitting this warning so I can't provide a Fixes tag. The function hasn't been touched for a year. I decided to workaround this by converting the pointer to a new array in stack, and then copying the data to the new array. It's only 16 bytes anyway and this is executed during association, so not in a hotpath. Tested-on: WCN6855 hw2.0 PCI WLAN.HSP.1.1-03125-QCAHSPSWPL_V1_V2_SILICONZ_LITE-3.6510.9 Reported-by: Linux Kernel Functional Testing <lkft@linaro.org> Link: https://lore.kernel.org/all/CA+G9fYsZ_qypa=jHY_dJ=tqX4515+qrV9n2SWXVDHve826nF7Q@mail.gmail.com/ Signed-off-by: Kalle Valo <quic_kvalo@quicinc.com> Signed-off-by: Kalle Valo <kvalo@kernel.org> Link: https://lore.kernel.org/r/20221010160638.20152-1-kvalo@kernel.org
Diffstat (limited to 'drivers/net')
-rw-r--r--drivers/net/wireless/ath/ath11k/mac.c5
1 files changed, 3 insertions, 2 deletions
diff --git a/drivers/net/wireless/ath/ath11k/mac.c b/drivers/net/wireless/ath/ath11k/mac.c
index 84d956ad4093..2d1e3fd9b526 100644
--- a/drivers/net/wireless/ath/ath11k/mac.c
+++ b/drivers/net/wireless/ath/ath11k/mac.c
@@ -2081,7 +2081,7 @@ static void ath11k_peer_assoc_h_he(struct ath11k *ar,
struct cfg80211_chan_def def;
const struct ieee80211_sta_he_cap *he_cap = &sta->deflink.he_cap;
enum nl80211_band band;
- u16 *he_mcs_mask;
+ u16 he_mcs_mask[NL80211_HE_NSS_MAX];
u8 max_nss, he_mcs;
u16 he_tx_mcs = 0, v = 0;
int i, he_nss, nss_idx;
@@ -2098,7 +2098,8 @@ static void ath11k_peer_assoc_h_he(struct ath11k *ar,
return;
band = def.chan->band;
- he_mcs_mask = arvif->bitrate_mask.control[band].he_mcs;
+ memcpy(he_mcs_mask, arvif->bitrate_mask.control[band].he_mcs,
+ sizeof(he_mcs_mask));
if (ath11k_peer_assoc_h_he_masked(he_mcs_mask))
return;