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drm/amdgpu/discovery: Replace fake flex-arrays with flexible-array members

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Zero-length and one-element arrays are deprecated, and we are moving
towards adopting C99 flexible-array members, instead.

Use the DECLARE_FLEX_ARRAY() helper macro to transform zero-length
arrays in a union into flexible-array members. And replace a one-element
array with a C99 flexible-array member.

Address the following warnings found with GCC-13 and
-fstrict-flex-arrays=3 enabled:
drivers/gpu/drm/amd/amdgpu/amdgpu_discovery.c:1009:89: warning: array subscript kk is outside array bounds of ‘uint32_t[0]’ {aka ‘unsigned int[]’} [-Warray-bounds=]
drivers/gpu/drm/amd/amdgpu/amdgpu_discovery.c:1007:94: warning: array subscript kk is outside array bounds of ‘uint64_t[0]’ {aka ‘long long unsigned int[]’} [-Warray-bounds=]
drivers/gpu/drm/amd/amdgpu/amdgpu_discovery.c:1310:94: warning: array subscript k is outside array bounds of ‘uint64_t[0]’ {aka ‘long long unsigned int[]’} [-Warray-bounds=]
drivers/gpu/drm/amd/amdgpu/amdgpu_discovery.c:1309:57: warning: array subscript k is outside array bounds of ‘uint32_t[0]’ {aka ‘unsigned int[]’} [-Warray-bounds=]

This helps with the ongoing efforts to tighten the FORTIFY_SOURCE
routines on memcpy() and help us make progress towards globally
enabling -fstrict-flex-arrays=3 [1].

This results in no differences in binary output.

Link: https://github.com/KSPP/linux/issues/21
Link: https://github.com/KSPP/linux/issues/193
Link: https://github.com/KSPP/linux/issues/300
Link: https://gcc.gnu.org/pipermail/gcc-patches/2022-October/602902.html [1]
Reviewed-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Gustavo A. R. Silva <gustavoars@kernel.org>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Gustavo A. R. Silva 2023-05-28 14:26:37 -06:00 • committed by Alex Deucher
parent 9f0bcf49e9
commit 5be7d4e3cf
1 changed files with 3 additions and 3 deletions
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6
drivers/gpu/drm/amd/include/discovery.h
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@ -122,7 +122,7 @@ typedef struct ip_v3
uint8_t sub_revision : 4; /* HCID Sub-Revision */
uint8_t variant : 4; /* HW variant */
#endif
uint32_t base_address[1]; /* Base Address list. Corresponds to the num_base_address field*/
uint32_t base_address[]; /* Base Address list. Corresponds to the num_base_address field*/
} ip_v3;
typedef struct ip_v4 {
@ -140,8 +140,8 @@ typedef struct ip_v4 {
uint8_t sub_revision : 4; /* HCID Sub-Revision */
#endif
union {
uint32_t base_address[0]; /* 32-bit Base Address list. Corresponds to the num_base_address field*/
uint64_t base_address_64[0]; /* 64-bit Base Address list. Corresponds to the num_base_address field*/
DECLARE_FLEX_ARRAY(uint32_t, base_address); /* 32-bit Base Address list. Corresponds to the num_base_address field*/
DECLARE_FLEX_ARRAY(uint64_t, base_address_64); /* 64-bit Base Address list. Corresponds to the num_base_address field*/
} __packed;
} ip_v4;