wifi: mt76: fix clang-specific fortify warnings

[ Upstream commit 03f0e11da7fb26db4f27e6b83a223512db9f7ca5 ]

When compiling with clang 16.0.6 and CONFIG_FORTIFY_SOURCE=y, I've
noticed the following (somewhat confusing due to absence of an actual
source code location):

In file included from drivers/net/wireless/mediatek/mt76/mt792x_core.c:4:
In file included from ./include/linux/module.h:13:
In file included from ./include/linux/stat.h:19:
In file included from ./include/linux/time.h:60:
In file included from ./include/linux/time32.h:13:
In file included from ./include/linux/timex.h:67:
In file included from ./arch/x86/include/asm/timex.h:5:
In file included from ./arch/x86/include/asm/processor.h:23:
In file included from ./arch/x86/include/asm/msr.h:11:
In file included from ./arch/x86/include/asm/cpumask.h:5:
In file included from ./include/linux/cpumask.h:12:
In file included from ./include/linux/bitmap.h:11:
In file included from ./include/linux/string.h:254:
./include/linux/fortify-string.h:592:4: warning: call to '__read_overflow2_field'
declared with 'warning' attribute: detected read beyond size of field (2nd
parameter); maybe use struct_group()? [-Wattribute-warning]
                        __read_overflow2_field(q_size_field, size);

In file included from drivers/net/wireless/mediatek/mt76/mt7915/main.c:4:
In file included from ./include/linux/etherdevice.h:20:
In file included from ./include/linux/if_ether.h:19:
In file included from ./include/linux/skbuff.h:15:
In file included from ./include/linux/time.h:60:
In file included from ./include/linux/time32.h:13:
In file included from ./include/linux/timex.h:67:
In file included from ./arch/x86/include/asm/timex.h:5:
In file included from ./arch/x86/include/asm/processor.h:23:
In file included from ./arch/x86/include/asm/msr.h:11:
In file included from ./arch/x86/include/asm/cpumask.h:5:
In file included from ./include/linux/cpumask.h:12:
In file included from ./include/linux/bitmap.h:11:
In file included from ./include/linux/string.h:254:
./include/linux/fortify-string.h:592:4: warning: call to '__read_overflow2_field'
declared with 'warning' attribute: detected read beyond size of field (2nd
parameter); maybe use struct_group()? [-Wattribute-warning]
                        __read_overflow2_field(q_size_field, size);

In file included from drivers/net/wireless/mediatek/mt76/mt7996/main.c:6:
In file included from drivers/net/wireless/mediatek/mt76/mt7996/mt7996.h:9:
In file included from ./include/linux/interrupt.h:8:
In file included from ./include/linux/cpumask.h:12:
In file included from ./include/linux/bitmap.h:11:
In file included from ./include/linux/string.h:254:
./include/linux/fortify-string.h:592:4: warning: call to '__read_overflow2_field'
declared with 'warning' attribute: detected read beyond size of field (2nd
parameter); maybe use struct_group()? [-Wattribute-warning]
                        __read_overflow2_field(q_size_field, size);

The compiler actually complains on 'mt7915_get_et_strings()',
'mt792x_get_et_strings()' and 'mt7996_get_et_strings()' due to the same
reason: fortification logic inteprets call to 'memcpy()' as an attempt
to copy the whole array from its first member and so issues an overread
warning. These warnings may be silenced by passing an address of the whole
array and not the first member to 'memcpy()'.

Signed-off-by: Dmitry Antipov <dmantipov@yandex.ru>
Signed-off-by: Felix Fietkau <nbd@nbd.name>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/drivers/net/wireless/mediatek/mt76/mt7915/main.c b/drivers/net/wireless/mediatek/mt76/mt7915/main.c
index d06c25dda325e65ba696b460d51a1bd5b7368240..d85105a43d704b5c0e6ae9551fa1b89ed3c54f44 100644 (file)
--- a/drivers/net/wireless/mediatek/mt76/mt7915/main.c
+++ b/drivers/net/wireless/mediatek/mt76/mt7915/main.c
@@ -1388,7 +1388,7 @@ void mt7915_get_et_strings(struct ieee80211_hw *hw,
        if (sset != ETH_SS_STATS)
                return;
 
-       memcpy(data, *mt7915_gstrings_stats, sizeof(mt7915_gstrings_stats));
+       memcpy(data, mt7915_gstrings_stats, sizeof(mt7915_gstrings_stats));
        data += sizeof(mt7915_gstrings_stats);
        page_pool_ethtool_stats_get_strings(data);
 }

diff --git a/drivers/net/wireless/mediatek/mt76/mt792x_core.c b/drivers/net/wireless/mediatek/mt76/mt792x_core.c
index ec98450a938ffc1072e66304e606658a0d7ab755..f111c47fdca56571875cbaddd28c1d3d93408d59 100644 (file)
--- a/drivers/net/wireless/mediatek/mt76/mt792x_core.c
+++ b/drivers/net/wireless/mediatek/mt76/mt792x_core.c
@@ -358,7 +358,7 @@ void mt792x_get_et_strings(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
        if (sset != ETH_SS_STATS)
                return;
 
-       memcpy(data, *mt792x_gstrings_stats, sizeof(mt792x_gstrings_stats));
+       memcpy(data, mt792x_gstrings_stats, sizeof(mt792x_gstrings_stats));
 
        data += sizeof(mt792x_gstrings_stats);
        page_pool_ethtool_stats_get_strings(data);

diff --git a/drivers/net/wireless/mediatek/mt76/mt7996/main.c b/drivers/net/wireless/mediatek/mt76/mt7996/main.c
index 6e0f0c100db840c7b9c3b9ecd6c1d1bc4f35662f..620880e560e00c724ea10c85ee9c5428d28df651 100644 (file)
--- a/drivers/net/wireless/mediatek/mt76/mt7996/main.c
+++ b/drivers/net/wireless/mediatek/mt76/mt7996/main.c
@@ -1198,7 +1198,7 @@ void mt7996_get_et_strings(struct ieee80211_hw *hw,
                           u32 sset, u8 *data)
 {
        if (sset == ETH_SS_STATS)
-               memcpy(data, *mt7996_gstrings_stats,
+               memcpy(data, mt7996_gstrings_stats,
                       sizeof(mt7996_gstrings_stats));
 }