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gpu: nvgpu: address NULL access during boot.

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The function nvgpu_pci_probe invokes nvgpu_kzalloc(g) with a pointer
to struct gk20a before setting the device pointer in struct
nvgpu_os_linux. This may result in NULL Pointer access in the function
nvgpu_log_name when some logs are enabled during boot.

As a solution, the implementation of nvgpu_log_name is updated to first
check for a valid pointer to a struct device before calling dev_name

Jira NVGPU-6770

Change-Id: I98a9746550e43f3b7a143f5b7c7141ff6c67f758
Signed-off-by: Debarshi Dutta <ddutta@nvidia.com>
Reviewed-on: https://git-master.nvidia.com/r/c/linux-nvgpu/+/2520355
Reviewed-by: svcacv <svcacv@nvidia.com>
Reviewed-by: Lakshmanan M <lm@nvidia.com>
Reviewed-by: Seshendra Gadagottu <sgadagottu@nvidia.com>
Reviewed-by: Vaibhav Kachore <vkachore@nvidia.com>
Reviewed-by: mobile promotions <svcmobile_promotions@nvidia.com>
Tested-by: mobile promotions <svcmobile_promotions@nvidia.com>
This commit is contained in:
Debarshi Dutta
2021-04-26 06:53:38 +00:00
committed by mobile promotions
parent 9019661e2f
commit 6222ebeaea
1 changed files with 3 additions and 3 deletions
Download Patch File Download Diff File Expand all files Collapse all files

6
drivers/gpu/nvgpu/os/linux/log.c
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@@ -1,5 +1,5 @@
/*
* Copyright (c) 2017-2019, NVIDIA CORPORATION. All rights reserved.
* Copyright (c) 2017-2021, 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,
@@ -47,7 +47,7 @@ static const char *log_types[] = {
static inline const char *nvgpu_log_name(struct gk20a *g)
{
return dev_name(dev_from_gk20a(g));
return dev_from_gk20a(g) == NULL ? "" : dev_name(dev_from_gk20a(g));
}
#ifdef CONFIG_GK20A_TRACE_PRINTK
@@ -124,7 +124,7 @@ void nvgpu_log_dbg_impl(struct gk20a *g, u64 log_mask,
(void) vsnprintf(log, LOG_BUFFER_LENGTH, fmt, args);
va_end(args);
__nvgpu_really_print_log(g->log_trace, nvgpu_log_name(g),
__nvgpu_really_print_log(g->log_trace, g ? nvgpu_log_name(g) : "",
func_name, line, NVGPU_DEBUG, log);
}