Kalle Valo <kvalo@xxxxxxxxxx> wrote: > From: Kalle Valo <quic_kvalo@xxxxxxxxxxx> > > 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@xxxxxxxxxx> > Link: https://lore.kernel.org/all/CA+G9fYsZ_qypa=jHY_dJ=tqX4515+qrV9n2SWXVDHve826nF7Q@xxxxxxxxxxxxxx/ > Signed-off-by: Kalle Valo <quic_kvalo@xxxxxxxxxxx> Patch applied to wireless.git, thanks. abf93f369419 wifi: ath11k: mac: fix reading 16 bytes from a region of size 0 warning -- https://patchwork.kernel.org/project/linux-wireless/patch/20221010160638.20152-1-kvalo@xxxxxxxxxx/ https://wireless.wiki.kernel.org/en/developers/documentation/submittingpatches
