diff options
author | Gustavo A. R. Silva <gustavoars@kernel.org> | 2023-02-02 19:34:05 -0600 |
---|---|---|
committer | Kalle Valo <kvalo@kernel.org> | 2023-02-13 18:53:24 +0200 |
commit | 235fd607c6cbd0f3922298200573b2b5f86295df (patch) | |
tree | e7ba92aba298e8d3552bc0cf478357bb5a2735f2 /drivers/net/wireless/marvell/mwifiex/fw.h | |
parent | 7fcae8f7f8158d22e667ed55a40e6a1829cc55b0 (diff) |
wifi: mwifiex: Replace one-element array with flexible-array member
One-element arrays are deprecated, and we are replacing them with flexible
array members instead. So, replace one-element array with flexible-array
member in struct mwifiex_ie_types_rates_param_set.
These are the only binary differences I see after the change:
mwifiex.o
_@@ -50154,7 +50154,7 @@
23514: R_X86_64_32S kmalloc_caches+0x50
23518: call 2351d <mwifiex_scan_networks+0x11d>
23519: R_X86_64_PLT32 __tsan_read8-0x4
- 2351d: mov $0x225,%edx
+ 2351d: mov $0x224,%edx
23522: mov $0xdc0,%esi
23527: mov 0x0(%rip),%rdi # 2352e <mwifiex_scan_networks+0x12e>
2352a: R_X86_64_PC32 kmalloc_caches+0x4c
scan.o
_@@ -5582,7 +5582,7 @@
4394: R_X86_64_32S kmalloc_caches+0x50
4398: call 439d <mwifiex_scan_networks+0x11d>
4399: R_X86_64_PLT32 __tsan_read8-0x4
- 439d: mov $0x225,%edx
+ 439d: mov $0x224,%edx
43a2: mov $0xdc0,%esi
43a7: mov 0x0(%rip),%rdi # 43ae <mwifiex_scan_networks+0x12e>
43aa: R_X86_64_PC32 kmalloc_caches+0x4c
and the reason for that is the following line:
drivers/net/wireless/marvell/mwifiex/scan.c:
1517 scan_cfg_out = kzalloc(sizeof(union mwifiex_scan_cmd_config_tlv),
1518 GFP_KERNEL);
sizeof(union mwifiex_scan_cmd_config_tlv) is now one-byte smaller due to the
flex-array transformation:
46 union mwifiex_scan_cmd_config_tlv {
47 /* Scan configuration (variable length) */
48 struct mwifiex_scan_cmd_config config;
49 /* Max allocated block */
50 u8 config_alloc_buf[MAX_SCAN_CFG_ALLOC];
51 };
Notice that MAX_SCAN_CFG_ALLOC is defined in terms of
sizeof(struct mwifiex_ie_types_rates_param_set), see:
26 /* Memory needed to store supported rate */
27 #define RATE_TLV_MAX_SIZE (sizeof(struct mwifiex_ie_types_rates_param_set) \
28 + HOSTCMD_SUPPORTED_RATES)
37 /* Maximum memory needed for a mwifiex_scan_cmd_config with all TLVs at max */
38 #define MAX_SCAN_CFG_ALLOC (sizeof(struct mwifiex_scan_cmd_config) \
39 + sizeof(struct mwifiex_ie_types_num_probes) \
40 + sizeof(struct mwifiex_ie_types_htcap) \
41 + CHAN_TLV_MAX_SIZE \
42 + RATE_TLV_MAX_SIZE \
43 + WILDCARD_SSID_TLV_MAX_SIZE)
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].
Link: https://github.com/KSPP/linux/issues/79
Link: https://github.com/KSPP/linux/issues/252
Link: https://gcc.gnu.org/pipermail/gcc-patches/2022-October/602902.html [1]
Signed-off-by: Gustavo A. R. Silva <gustavoars@kernel.org>
Reviewed-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Kalle Valo <kvalo@kernel.org>
Link: https://lore.kernel.org/r/Y9xkjXeElSEQ0FPY@work
Diffstat (limited to 'drivers/net/wireless/marvell/mwifiex/fw.h')
-rw-r--r-- | drivers/net/wireless/marvell/mwifiex/fw.h | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/net/wireless/marvell/mwifiex/fw.h b/drivers/net/wireless/marvell/mwifiex/fw.h index 0c167a1d9b0b..f2168fac95ed 100644 --- a/drivers/net/wireless/marvell/mwifiex/fw.h +++ b/drivers/net/wireless/marvell/mwifiex/fw.h @@ -794,7 +794,7 @@ struct mwifiex_ie_types_chan_band_list_param_set { struct mwifiex_ie_types_rates_param_set { struct mwifiex_ie_types_header header; - u8 rates[1]; + u8 rates[]; } __packed; struct mwifiex_ie_types_ssid_param_set { |