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gpu: nvgpu: fix ecc counter free

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ECC counter structures are freed without removing the node from the
stats_list. This can lead to invalid access due to dangling pointers.

Update the ecc counter free logic to set them to NULL upon free, to
remove them from stats_list and free them by validation.

Also updated some of the ecc init paths where error was not propa-
gated to callers and full ecc counters deallocation was not done.

Now, calling unit ecc_free from any context (with counters alloc-
ated or not) is harmless as requisite checks are in place.

bug 3326612
bug 3345977

Change-Id: I05eb6ed226cff9197ad37776912da9dcb7e0716d
Signed-off-by: Sagar Kamble <skamble@nvidia.com>
Reviewed-on: https://git-master.nvidia.com/r/c/linux-nvgpu/+/2565264
Tested-by: Ashish Mhetre <amhetre@nvidia.com>
Tested-by: mobile promotions <svcmobile_promotions@nvidia.com>
Reviewed-by: svc_kernel_abi <svc_kernel_abi@nvidia.com>
Reviewed-by: Konsta Holtta <kholtta@nvidia.com>
Reviewed-by: Deepak Nibade <dnibade@nvidia.com>
Reviewed-by: mobile promotions <svcmobile_promotions@nvidia.com>
GVS: Gerrit_Virtual_Submit
This commit is contained in:
Sagar Kamble
2021-06-17 11:34:36 +05:30
committed by mobile promotions
parent 2887d06e3b
commit 40064ef1ec
33 changed files with 546 additions and 218 deletions
Download Patch File Download Diff File Expand all files Collapse all files

15
drivers/gpu/nvgpu/os/linux/ecc_sysfs.c
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@@ -1,5 +1,5 @@
/*
* Copyright (c) 2018, NVIDIA CORPORATION. All rights reserved.
* Copyright (c) 2018-2021, NVIDIA CORPORATION. All rights reserved.
*
* This program is free software; you can redistribute it and/or modify it
* under the terms and conditions of the GNU General Public License,
@@ -28,9 +28,13 @@ int nvgpu_ecc_sysfs_init(struct gk20a *g)
struct nvgpu_ecc_stat *stat;
int i = 0, err;
nvgpu_mutex_acquire(&ecc->stats_lock);
attr = nvgpu_kzalloc(g, sizeof(*attr) * ecc->stats_count);
if (!attr)
if (!attr) {
nvgpu_mutex_release(&ecc->stats_lock);
return -ENOMEM;
}
nvgpu_list_for_each_entry(stat,
&ecc->stats_list, nvgpu_ecc_stat, node) {
@@ -54,6 +58,8 @@ int nvgpu_ecc_sysfs_init(struct gk20a *g)
i++;
}
nvgpu_mutex_release(&ecc->stats_lock);
if (err) {
while (i-- > 0)
device_remove_file(dev, &attr[i].attr);
@@ -73,8 +79,13 @@ void nvgpu_ecc_sysfs_remove(struct gk20a *g)
struct nvgpu_ecc *ecc = &g->ecc;
int i;
nvgpu_mutex_acquire(&ecc->stats_lock);
for (i = 0; i < ecc->stats_count; i++)
device_remove_file(dev, &l->ecc_attrs[i].attr);
nvgpu_mutex_release(&ecc->stats_lock);
nvgpu_kfree(g, l->ecc_attrs);
l->ecc_attrs = NULL;
}