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Date: Tue, 27 Oct 2020 20:57:20 +0300
From: Dan Carpenter <dan.carpenter@...cle.com>
To: kbuild@...ts.01.org, Kent Russell <kent.russell@....com>
Cc: lkp@...el.com, kbuild-all@...ts.01.org,
linux-kernel@...r.kernel.org,
Alex Deucher <alexander.deucher@....com>
Subject: [kbuild] drivers/gpu/drm/amd/amdkfd/kfd_crat.c:801:9: warning:
Either the condition '!pcrat_image' is redundant or there is possible null
pointer dereference: pcrat_image.
tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head: 4525c8781ec0701ce824e8bd379ae1b129e26568
commit: d0e63b343e575e8b74c185565b0d79a93494bcaa drm/amdkfd: Use kvmalloc instead of kmalloc for VCRAT
compiler: powerpc64le-linux-gcc (GCC) 9.3.0
If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@...el.com>
cppcheck possible warnings: (new ones prefixed by >>, may not real problems)
In file included from drivers/gpu/drm/amd/amdgpu/../amdkfd/kfd_crat.c:
>> drivers/gpu/drm/amd/amdkfd/kfd_crat.c:801:9: warning: Either the condition '!pcrat_image' is redundant or there is possible null pointer dereference: pcrat_image. [nullPointerRedundantCheck]
memcpy(pcrat_image, crat_table, crat_table->length);
^
drivers/gpu/drm/amd/amdkfd/kfd_crat.c:802:6: note: Assuming that condition '!pcrat_image' is not redundant
if (!pcrat_image)
^
drivers/gpu/drm/amd/amdkfd/kfd_crat.c:801:9: note: Null pointer dereference
memcpy(pcrat_image, crat_table, crat_table->length);
^
drivers/gpu/drm/amd/amdkfd/kfd_crat.c:405:32: warning: Shifting signed 32-bit value by 31 bits is undefined behaviour [shiftTooManyBitsSigned]
if (props && (iolink->flags & CRAT_IOLINK_FLAGS_BI_DIRECTIONAL)) {
^
drivers/gpu/drm/amd/amdkfd/kfd_crat.c:1112:26: warning: Shifting signed 32-bit value by 31 bits is undefined behaviour [shiftTooManyBitsSigned]
sub_type_hdr->flags |= CRAT_IOLINK_FLAGS_BI_DIRECTIONAL;
^
drivers/gpu/drm/amd/amdkfd/kfd_crat.c:1146:11: warning: Shifting signed 32-bit value by 31 bits is undefined behaviour [shiftTooManyBitsSigned]
CRAT_IOLINK_FLAGS_BI_DIRECTIONAL;
^
drivers/gpu/drm/amd/amdkfd/kfd_crat.c:941:3: warning: Assignment of function parameter has no effect outside the function. Did you forget dereferencing it? [uselessAssignmentPtrArg]
sub_type_hdr++;
^
vim +801 drivers/gpu/drm/amd/amdkfd/kfd_crat.c
8e05247d4c23ff1 Harish Kasiviswanathan 2017-12-08 772 int kfd_create_crat_image_acpi(void **crat_image, size_t *size)
174de876d6d02f7 Felix Kuehling 2017-12-08 773 {
174de876d6d02f7 Felix Kuehling 2017-12-08 774 struct acpi_table_header *crat_table;
174de876d6d02f7 Felix Kuehling 2017-12-08 775 acpi_status status;
8e05247d4c23ff1 Harish Kasiviswanathan 2017-12-08 776 void *pcrat_image;
174de876d6d02f7 Felix Kuehling 2017-12-08 777
8e05247d4c23ff1 Harish Kasiviswanathan 2017-12-08 778 if (!crat_image)
174de876d6d02f7 Felix Kuehling 2017-12-08 779 return -EINVAL;
174de876d6d02f7 Felix Kuehling 2017-12-08 780
8e05247d4c23ff1 Harish Kasiviswanathan 2017-12-08 781 *crat_image = NULL;
8e05247d4c23ff1 Harish Kasiviswanathan 2017-12-08 782
8e05247d4c23ff1 Harish Kasiviswanathan 2017-12-08 783 /* Fetch the CRAT table from ACPI */
174de876d6d02f7 Felix Kuehling 2017-12-08 784 status = acpi_get_table(CRAT_SIGNATURE, 0, &crat_table);
174de876d6d02f7 Felix Kuehling 2017-12-08 785 if (status == AE_NOT_FOUND) {
174de876d6d02f7 Felix Kuehling 2017-12-08 786 pr_warn("CRAT table not found\n");
174de876d6d02f7 Felix Kuehling 2017-12-08 787 return -ENODATA;
174de876d6d02f7 Felix Kuehling 2017-12-08 788 } else if (ACPI_FAILURE(status)) {
174de876d6d02f7 Felix Kuehling 2017-12-08 789 const char *err = acpi_format_exception(status);
174de876d6d02f7 Felix Kuehling 2017-12-08 790
174de876d6d02f7 Felix Kuehling 2017-12-08 791 pr_err("CRAT table error: %s\n", err);
174de876d6d02f7 Felix Kuehling 2017-12-08 792 return -EINVAL;
174de876d6d02f7 Felix Kuehling 2017-12-08 793 }
174de876d6d02f7 Felix Kuehling 2017-12-08 794
6127896f4a27257 Huang Rui 2020-08-18 795 if (kfd_ignore_crat()) {
ebcfd1e276207e4 Felix Kuehling 2017-12-08 796 pr_info("CRAT table disabled by module option\n");
ebcfd1e276207e4 Felix Kuehling 2017-12-08 797 return -ENODATA;
ebcfd1e276207e4 Felix Kuehling 2017-12-08 798 }
ebcfd1e276207e4 Felix Kuehling 2017-12-08 799
d0e63b343e575e8 Kent Russell 2020-09-18 800 pcrat_image = kvmalloc(crat_table->length, GFP_KERNEL);
d0e63b343e575e8 Kent Russell 2020-09-18 @801 memcpy(pcrat_image, crat_table, crat_table->length);
^^^^^^^^^^^
Dereferenced before the check for NULL
8e05247d4c23ff1 Harish Kasiviswanathan 2017-12-08 802 if (!pcrat_image)
^^^^^^^^^^^^
Check.
8e05247d4c23ff1 Harish Kasiviswanathan 2017-12-08 803 return -ENOMEM;
174de876d6d02f7 Felix Kuehling 2017-12-08 804
8e05247d4c23ff1 Harish Kasiviswanathan 2017-12-08 805 *crat_image = pcrat_image;
174de876d6d02f7 Felix Kuehling 2017-12-08 806 *size = crat_table->length;
174de876d6d02f7 Felix Kuehling 2017-12-08 807
174de876d6d02f7 Felix Kuehling 2017-12-08 808 return 0;
174de876d6d02f7 Felix Kuehling 2017-12-08 809 }
---
0-DAY CI Kernel Test Service, Intel Corporation
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