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gpu: nvgpu: fix race for channel sync read/write

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CTS test dEQP-VK.api.object_management.max_concurrent.device_group
crashes with invalid userspace memory access.
Currently, nvgpu_submit_prepare_syncs() races with
nvgpu_channel_clean_up_jobs() and this race condition is exposed when
aggressive_sync_destroy_thresh is set to non-zero value.
nvgpu_submit_prepare_syncs() gets ref for c->sync to submit job and
releases channel sync_lock. Meanwhile, nvgpu_worker_poll_work()
triggers nvgpu_channel_clean_up_jobs(), which destroys ref'd c->sync
pointer.
This patch protects channel's sync pointer by holding channel sync_lock
during complete execution of nvgpu_submit_prepare_syncs().

Bug 2613870

Change-Id: I6f3d48aff361d1cb38c30d2ce5de276d0c55fb6f
Signed-off-by: Seema Khowala <seemaj@nvidia.com>
Reviewed-on: https://git-master.nvidia.com/r/2176929
Reviewed-by: Vedashree Vidwans <vvidwans@nvidia.com>
Reviewed-by: Debarshi Dutta <ddutta@nvidia.com>
GVS: Gerrit_Virtual_Submit
Tested-by: Vedashree Vidwans <vvidwans@nvidia.com>
Reviewed-by: Alex Waterman <alexw@nvidia.com>
Reviewed-by: mobile promotions <svcmobile_promotions@nvidia.com>
Tested-by: mobile promotions <svcmobile_promotions@nvidia.com>
This commit is contained in:
Seema Khowala
2019-08-16 10:39:18 -07:00
committed by mobile promotions
parent 26d955be23
commit e22d743a20
2 changed files with 6 additions and 5 deletions
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5
drivers/gpu/nvgpu/common/fifo/channel.c
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@@ -1357,6 +1357,8 @@ void nvgpu_channel_clean_up_jobs(struct nvgpu_channel *c,
break;
}
nvgpu_mutex_acquire(&c->sync_lock);
WARN_ON(c->sync == NULL);
if (c->sync != NULL) {
@@ -1366,16 +1368,15 @@ void nvgpu_channel_clean_up_jobs(struct nvgpu_channel *c,
}
if (g->aggressive_sync_destroy_thresh != 0U) {
nvgpu_mutex_acquire(&c->sync_lock);
if (nvgpu_channel_sync_put_ref_and_check(c->sync)
&& g->aggressive_sync_destroy) {
nvgpu_channel_sync_destroy(c->sync,
false);
c->sync = NULL;
}
nvgpu_mutex_release(&c->sync_lock);
}
}
nvgpu_mutex_release(&c->sync_lock);
if (job->num_mapped_buffers != 0U) {
nvgpu_vm_put_buffers(vm, job->mapped_buffers,