Hello, There is a problem on line 21 if i915 can actually be NULL.
julia
---------- Forwarded message ----------
Date: Sat, 14 Nov 2020 19:03:47 +0800
From: kernel test robot <l...@intel.com>
To: kbu...@lists.01.org
Cc: l...@intel.com, Julia Lawall <julia.law...@lip6.fr>
Subject: Re: [Intel-gfx] [PATCH 05/27] drm/i915/pxp: Enable ioctl action to set
the ring3 context
CC: kbuild-...@lists.01.org
In-Reply-To: <20201114014537.25495-5-sean.z.hu...@intel.com>
References: <20201114014537.25495-5-sean.z.hu...@intel.com>
TO: Sean Z Huang <sean.z.hu...@intel.com>
TO: Intel-gfx@lists.freedesktop.org
CC: "Huang, Sean Z" <sean.z.hu...@intel.com>
Hi Sean,
Thank you for the patch! Perhaps something to improve:
[auto build test WARNING on next-20201113]
[also build test WARNING on v5.10-rc3]
[cannot apply to drm-intel/for-linux-next char-misc/char-misc-testing v5.10-rc3
v5.10-rc2 v5.10-rc1]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch]
url:
https://github.com/0day-ci/linux/commits/Sean-Z-Huang/drm-i915-pxp-Introduce-Intel-PXP-component/20201114-094926
base: 92edc4aef86780a8ad01b092c6d6630bb3cb423d
:::::: branch date: 9 hours ago
:::::: commit date: 9 hours ago
config: i386-randconfig-c001-20201113 (attached as .config)
compiler: gcc-9 (Debian 9.3.0-15) 9.3.0
If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <l...@intel.com>
Reported-by: Julia Lawall <julia.law...@lip6.fr>
"coccinelle warnings: (new ones prefixed by >>)"
>> drivers/gpu/drm/i915/pxp/intel_pxp.c:21:17-20: ERROR: i915 is NULL but
>> dereferenced.
vim +21 drivers/gpu/drm/i915/pxp/intel_pxp.c
a9c9ffc6ce4f8b0 Huang, Sean Z 2020-11-13 10
1d109ada10e82c3 Huang, Sean Z 2020-11-13 11 int i915_pxp_ops_ioctl(struct
drm_device *dev, void *data, struct drm_file *drmfile)
1d109ada10e82c3 Huang, Sean Z 2020-11-13 12 {
1d109ada10e82c3 Huang, Sean Z 2020-11-13 13 int ret;
1d109ada10e82c3 Huang, Sean Z 2020-11-13 14 struct pxp_info pxp_info = {0};
1d109ada10e82c3 Huang, Sean Z 2020-11-13 15 struct drm_i915_pxp_ops
*pxp_ops = data;
1d109ada10e82c3 Huang, Sean Z 2020-11-13 16 struct drm_i915_private *i915 =
to_i915(dev);
1d109ada10e82c3 Huang, Sean Z 2020-11-13 17
1d109ada10e82c3 Huang, Sean Z 2020-11-13 18 drm_dbg(&i915->drm, ">>> %s\n",
__func__);
1d109ada10e82c3 Huang, Sean Z 2020-11-13 19
1d109ada10e82c3 Huang, Sean Z 2020-11-13 20 if (!i915 || !drmfile ||
!pxp_ops || pxp_ops->pxp_info_size != sizeof(pxp_info)) {
1d109ada10e82c3 Huang, Sean Z 2020-11-13 @21 drm_dbg(&i915->drm,
"Failed to %s, invalid params\n", __func__);
1d109ada10e82c3 Huang, Sean Z 2020-11-13 22 ret = -EINVAL;
1d109ada10e82c3 Huang, Sean Z 2020-11-13 23 goto end;
1d109ada10e82c3 Huang, Sean Z 2020-11-13 24 }
1d109ada10e82c3 Huang, Sean Z 2020-11-13 25
1d109ada10e82c3 Huang, Sean Z 2020-11-13 26 if (copy_from_user(&pxp_info,
(void __user *)pxp_ops->pxp_info_ptr, sizeof(pxp_info)) != 0) {
1d109ada10e82c3 Huang, Sean Z 2020-11-13 27 ret = -EFAULT;
1d109ada10e82c3 Huang, Sean Z 2020-11-13 28 goto end;
1d109ada10e82c3 Huang, Sean Z 2020-11-13 29 }
1d109ada10e82c3 Huang, Sean Z 2020-11-13 30
1d109ada10e82c3 Huang, Sean Z 2020-11-13 31 drm_dbg(&i915->drm, "i915 pxp
ioctl call with action=[%d]\n", pxp_info.action);
1d109ada10e82c3 Huang, Sean Z 2020-11-13 32
1d109ada10e82c3 Huang, Sean Z 2020-11-13 33
mutex_lock(&i915->pxp.r0ctx->ctx_mutex);
1d109ada10e82c3 Huang, Sean Z 2020-11-13 34
1d109ada10e82c3 Huang, Sean Z 2020-11-13 35 if
(i915->pxp.r0ctx->global_state_in_suspend) {
1d109ada10e82c3 Huang, Sean Z 2020-11-13 36 drm_dbg(&i915->drm,
"Return failure due to state in suspend\n");
1d109ada10e82c3 Huang, Sean Z 2020-11-13 37 pxp_info.sm_status =
PXP_SM_STATUS_SESSION_NOT_AVAILABLE;
1d109ada10e82c3 Huang, Sean Z 2020-11-13 38 ret = 0;
1d109ada10e82c3 Huang, Sean Z 2020-11-13 39 goto end;
1d109ada10e82c3 Huang, Sean Z 2020-11-13 40 }
1d109ada10e82c3 Huang, Sean Z 2020-11-13 41
1d109ada10e82c3 Huang, Sean Z 2020-11-13 42 if
(i915->pxp.r0ctx->global_state_attacked) {
1d109ada10e82c3 Huang, Sean Z 2020-11-13 43 drm_dbg(&i915->drm,
"Retry required due to state attacked\n");
1d109ada10e82c3 Huang, Sean Z 2020-11-13 44 pxp_info.sm_status =
PXP_SM_STATUS_RETRY_REQUIRED;
1d109ada10e82c3 Huang, Sean Z 2020-11-13 45 ret = 0;
1d109ada10e82c3 Huang, Sean Z 2020-11-13 46 goto end;
1d109ada10e82c3 Huang, Sean Z 2020-11-13 47 }
1d109ada10e82c3 Huang, Sean Z 2020-11-13 48
1d109ada10e82c3 Huang, Sean Z 2020-11-13 49 switch (pxp_info.action) {
1d109ada10e82c3 Huang, Sean Z 2020-11-13 50 case PXP_ACTION_SET_R3_CONTEXT:
1d109ada10e82c3 Huang, Sean Z 2020-11-13 51 {
1d109ada10e82c3 Huang, Sean Z 2020-11-13 52 ret =
intel_pxp_set_r3ctx(i915, pxp_info.set_r3ctx);
1d109ada10e82c3 Huang, Sean Z 2020-11-13 53 break;
1d109ada10e82c3 Huang, Sean Z 2020-11-13 54 }
1d109ada10e82c3 Huang, Sean Z 2020-11-13 55 default:
1d109ada10e82c3 Huang, Sean Z 2020-11-13 56 drm_dbg(&i915->drm,
"Failed to %s due to bad params\n", __func__);
1d109ada10e82c3 Huang, Sean Z 2020-11-13 57 ret = -EINVAL;
1d109ada10e82c3 Huang, Sean Z 2020-11-13 58 goto end;
1d109ada10e82c3 Huang, Sean Z 2020-11-13 59 }
1d109ada10e82c3 Huang, Sean Z 2020-11-13 60
1d109ada10e82c3 Huang, Sean Z 2020-11-13 61 end:
1d109ada10e82c3 Huang, Sean Z 2020-11-13 62
mutex_unlock(&i915->pxp.r0ctx->ctx_mutex);
1d109ada10e82c3 Huang, Sean Z 2020-11-13 63
1d109ada10e82c3 Huang, Sean Z 2020-11-13 64 if (ret == 0)
1d109ada10e82c3 Huang, Sean Z 2020-11-13 65 if (copy_to_user((void
__user *)pxp_ops->pxp_info_ptr, &pxp_info, sizeof(pxp_info)) != 0)
1d109ada10e82c3 Huang, Sean Z 2020-11-13 66 ret = -EFAULT;
1d109ada10e82c3 Huang, Sean Z 2020-11-13 67
1d109ada10e82c3 Huang, Sean Z 2020-11-13 68 if (ret)
1d109ada10e82c3 Huang, Sean Z 2020-11-13 69
dev_err(&dev->pdev->dev, "pid=%d, ret = %d\n", task_pid_nr(current), ret);
1d109ada10e82c3 Huang, Sean Z 2020-11-13 70
1d109ada10e82c3 Huang, Sean Z 2020-11-13 71 drm_dbg(&i915->drm, "<<< %s\n",
__func__);
1d109ada10e82c3 Huang, Sean Z 2020-11-13 72 return ret;
1d109ada10e82c3 Huang, Sean Z 2020-11-13 73 }
1d109ada10e82c3 Huang, Sean Z 2020-11-13 74
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