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Date: Thu, 10 Dec 2020 20:10:32 +0200
From: Iskren Chernev <iskren.chernev@...il.com>
To: Rob Clark <robdclark@...il.com>, dri-devel@...ts.freedesktop.org
Cc: Rob Clark <robdclark@...omium.org>, Sean Paul <sean@...rly.run>,
David Airlie <airlied@...ux.ie>,
Daniel Vetter <daniel@...ll.ch>,
"open list:DRM DRIVER FOR MSM ADRENO GPU"
<linux-arm-msm@...r.kernel.org>,
"open list:DRM DRIVER FOR MSM ADRENO GPU"
<freedreno@...ts.freedesktop.org>,
open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] drm/msm: Fix WARN_ON() splat in _free_object()
On 12/10/20 7:40 PM, Rob Clark wrote:
> From: Rob Clark <robdclark@...omium.org>
>
> [ 192.062000] ------------[ cut here ]------------
> [ 192.062498] WARNING: CPU: 3 PID: 2039 at
drivers/gpu/drm/msm/msm_gem.c:381 put_iova_vmas+0x94/0xa0 [msm]
> [ 192.062870] Modules linked in: snd_hrtimer snd_seq snd_seq_device
rfcomm algif_hash algif_skcipher af_alg bnep xt_CHECKSUM nft_chain_nat
xt_MASQUERADE nf_nat nf_conntrack nf_defrag_ipv6 nf_defrag_ipv4
nft_counter xt_tcpudp nft_compat cpufreq_powersave cpufreq_conservative
q6asm_dai q6routing q6afe_dai q6adm bridge q6afe q6asm q6dsp_common
q6core stp llc nf_tables libcrc32c nfnetlink snd_soc_wsa881x regmap_sdw
soundwire_qcom gpio_wcd934x snd_soc_wcd934x wcd934x regmap_slimbus
venus_enc venus_dec apr videobuf2_dma_sg qrtr_smd uvcvideo
videobuf2_vmalloc videobuf2_memops ath10k_snoc ath10k_core hci_uart
btqca btbcm mac80211 bluetooth snd_soc_sdm845 ath snd_soc_rt5663
snd_soc_qcom_common snd_soc_rl6231 soundwire_bus ecdh_generic ecc
qcom_spmi_adc5 venus_core qcom_pon qcom_spmi_temp_alarm qcom_vadc_common
v4l2_mem2mem videobuf2_v4l2 cfg80211 videobuf2_common hid_multitouch
reset_qcom_pdc qcrypto qcom_rng rfkill qcom_q6v5_mss libarc4 libdes qrtr
ns qcom_wdt socinfo slim_qcom_ngd_ctrl
> [ 192.065739] pdr_interface qcom_q6v5_pas slimbus qcom_pil_info
qcom_q6v5 qcom_sysmon qcom_common qcom_glink_smem qmi_helpers rmtfs_mem
tcp_bbr sch_fq fuse ip_tables x_tables ipv6 crc_ccitt ti_sn65dsi86
i2c_hid msm mdt_loader llcc_qcom rtc_pm8xxx ocmem drm_kms_helper
crct10dif_ce phy_qcom_qusb2 i2c_qcom_geni panel_simple drm pwm_bl
> [ 192.066066] CPU: 3 PID: 2039 Comm: gnome-shell Tainted: G
W 5.10.0-rc7-next-20201208 #1
> [ 192.066068] Hardware name: LENOVO 81JL/LNVNB161216, BIOS
9UCN33WW(V2.06) 06/ 4/2019
> [ 192.066072] pstate: 40400005 (nZcv daif +PAN -UAO -TCO BTYPE=--)
> [ 192.066099] pc : put_iova_vmas+0x94/0xa0 [msm]
> [ 192.066262] lr : put_iova_vmas+0x1c/0xa0 [msm]
> [ 192.066403] sp : ffff800019efbbb0
> [ 192.066405] x29: ffff800019efbbb0 x28: ffff800019efbd88
> [ 192.066411] x27: 0000000000000000 x26: ffff109582efa400
> [ 192.066417] x25: 0000000000000009 x24: 000000000000012b
> [ 192.066422] x23: ffff109582efa438 x22: ffff109582efa450
> [ 192.066427] x21: ffff109582efa528 x20: ffff1095cbd4f200
> [ 192.066432] x19: ffff1095cbd4f200 x18: 0000000000000000
> [ 192.066438] x17: 0000000000000000 x16: ffffc26c200ca750
> [ 192.066727] x15: 0000000000000000 x14: 0000000000000000
> [ 192.066741] x13: ffff1096fb8c9100 x12: 0000000000000002
> [ 192.066754] x11: ffffffffffffffff x10: 0000000000000002
> [ 192.067046] x9 : 0000000000000001 x8 : 0000000000000a36
> [ 192.067060] x7 : ffff4e2ad9f11000 x6 : ffffc26c216d4000
> [ 192.067212] x5 : ffffc26c2022661c x4 : ffff1095c2b98000
> [ 192.067367] x3 : ffff1095cbd4f300 x2 : 0000000000000000
> [ 192.067380] x1 : ffff1095c2b98000 x0 : 0000000000000000
> [ 192.067667] Call trace:
> [ 192.067734] put_iova_vmas+0x94/0xa0 [msm]
> [ 192.068078] msm_gem_free_object+0xb4/0x110 [msm]
> [ 192.068399] drm_gem_object_free+0x1c/0x30 [drm]
> [ 192.068717] drm_gem_object_handle_put_unlocked+0xf0/0xf8 [drm]
> [ 192.069032] drm_gem_object_release_handle+0x6c/0x88 [drm]
> [ 192.069349] drm_gem_handle_delete+0x68/0xc0 [drm]
> [ 192.069666] drm_gem_close_ioctl+0x30/0x48 [drm]
> [ 192.069984] drm_ioctl_kernel+0xc0/0x110 [drm]
> [ 192.070303] drm_ioctl+0x210/0x440 [drm]
> [ 192.070588] __arm64_sys_ioctl+0xa8/0xf0
> [ 192.070599] el0_svc_common.constprop.0+0x74/0x190
> [ 192.070608] do_el0_svc+0x24/0x90
> [ 192.070618] el0_svc+0x14/0x20
> [ 192.070903] el0_sync_handler+0xb0/0xb8
> [ 192.070911] el0_sync+0x174/0x180
> [ 192.070918] ---[ end trace bee6b12a899001a3 ]---
> [ 192.072140] ------------[ cut here ]------------
>
> Fixes: 9b73bde39cf2 ("drm/msm: Fix use-after-free in msm_gem with
carveout")
> Signed-off-by: Rob Clark <robdclark@...omium.org>
> ---
> drivers/gpu/drm/msm/msm_gem.c | 5 +++--
> 1 file changed, 3 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/gpu/drm/msm/msm_gem.c
b/drivers/gpu/drm/msm/msm_gem.c
> index 68a6c7eacc0a..a21be5b910ff 100644
> --- a/drivers/gpu/drm/msm/msm_gem.c
> +++ b/drivers/gpu/drm/msm/msm_gem.c
> @@ -990,6 +990,8 @@ void msm_gem_free_object(struct drm_gem_object *obj)
> if (msm_obj->pages)
> kvfree(msm_obj->pages);
>
> + put_iova_vmas(obj);
> +
> /* dma_buf_detach() grabs resv lock, so we need to unlock
> * prior to drm_prime_gem_destroy
> */
> @@ -999,11 +1001,10 @@ void msm_gem_free_object(struct drm_gem_object
*obj)
> } else {
> msm_gem_vunmap(obj);
> put_pages(obj);
> + put_iova_vmas(obj);
> msm_gem_unlock(obj);
> }
>
> - put_iova_vmas(obj);
> -
> drm_gem_object_release(obj);
>
> kfree(msm_obj);
Ah, the put_iova_vmas needs to happen inside the msm_gem_lock|unlock.
My bad!
Acked-by: Iskren Chernev <iskren.chernev@...il.com>
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