| Message ID | 20230829094541.234751-1-dmantipov@yandex.ru |
|---|---|
| State | New |
| Headers | show |
| Series | wifi: plfxlc: fix clang-specific fortify warning | expand |
Dmitry Antipov <dmantipov@yandex.ru> wrote: > 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/purelifi/plfxlc/mac.c:6: > In file included from ./include/linux/netdevice.h:24: > In file included from ./include/linux/timer.h:6: > In file included from ./include/linux/ktime.h:24: > 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); > > The compiler actually complains on 'plfxlc_get_et_strings()' where > fortification logic inteprets call to 'memcpy()' as an attempt to copy > the whole 'et_strings' array from its first member and so issues an > overread warning. This warning 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> Patch applied to wireless-next.git, thanks. a763e92c7861 wifi: plfxlc: fix clang-specific fortify warning
diff --git a/drivers/net/wireless/purelifi/plfxlc/mac.c b/drivers/net/wireless/purelifi/plfxlc/mac.c index 94ee831b5de3..506d2f31efb5 100644 --- a/drivers/net/wireless/purelifi/plfxlc/mac.c +++ b/drivers/net/wireless/purelifi/plfxlc/mac.c @@ -666,7 +666,7 @@ static void plfxlc_get_et_strings(struct ieee80211_hw *hw, u32 sset, u8 *data) { if (sset == ETH_SS_STATS) - memcpy(data, *et_strings, sizeof(et_strings)); + memcpy(data, et_strings, sizeof(et_strings)); } static void plfxlc_get_et_stats(struct ieee80211_hw *hw,
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/purelifi/plfxlc/mac.c:6: In file included from ./include/linux/netdevice.h:24: In file included from ./include/linux/timer.h:6: In file included from ./include/linux/ktime.h:24: 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); The compiler actually complains on 'plfxlc_get_et_strings()' where fortification logic inteprets call to 'memcpy()' as an attempt to copy the whole 'et_strings' array from its first member and so issues an overread warning. This warning 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> --- drivers/net/wireless/purelifi/plfxlc/mac.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)