error: call to ‘__read_overflow2’ declared with attribute error: detected read beyond size of object passed as 2nd parameter

[Bloodlog]

Hi! I am trying to install wifi driver on xiaomi redmi 15 ryzen edition laptop.

$ make
#rm -f .symvers.8852be
make ARCH=x86_64 CROSS_COMPILE= -C /lib/modules/5.15.0-25-generic/build M=/home/bloodlog/rtw8852be  modules
make[1]: вход в каталог «/usr/src/linux-headers-5.15.0-25-generic»
  CC [M]  /home/bloodlog/rtw8852be/phl/hal_g6/btc/hal_btc.o
In file included from ./include/linux/string.h:262,
                 from ./include/linux/bitmap.h:10,
                 from ./include/linux/cpumask.h:12,
                 from ./arch/x86/include/asm/cpumask.h:5,
                 from ./arch/x86/include/asm/msr.h:11,
                 from ./arch/x86/include/asm/processor.h:22,
                 from ./arch/x86/include/asm/timex.h:5,
                 from ./include/linux/timex.h:65,
                 from ./include/linux/time32.h:13,
                 from ./include/linux/time.h:60,
                 from ./include/linux/stat.h:19,
                 from ./include/linux/module.h:13,
                 from /home/bloodlog/rtw8852be/include/basic_types.h:38,
                 from /home/bloodlog/rtw8852be/include/drv_types.h:24,
                 from /home/bloodlog/rtw8852be/phl/hal_g6/btc/../../pltfm_ops_linux.h:17,
                 from /home/bloodlog/rtw8852be/phl/hal_g6/btc/../../pltfm_ops.h:21,
                 from /home/bloodlog/rtw8852be/phl/hal_g6/btc/../hal_headers_le.h:22,
                 from /home/bloodlog/rtw8852be/phl/hal_g6/btc/hal_btc.c:16:
In function ‘memcpy’,
    inlined from ‘hal_btc_init’ at /home/bloodlog/rtw8852be/phl/hal_g6/btc/hal_btc.c:1861:2:
./include/linux/fortify-string.h:187:25: error: call to ‘__read_overflow2’ declared with attribute error: detected read beyond size of object passed as 2nd parameter
  187 |                         __read_overflow2();
      |                         ^~~~~~~~~~~~~~~~~~
make[2]: *** [scripts/Makefile.build:285: /home/bloodlog/rtw8852be/phl/hal_g6/btc/hal_btc.o] Ошибка 1
make[1]: *** [Makefile:1875: /home/bloodlog/rtw8852be] Ошибка 2
make[1]: выход из каталога «/usr/src/linux-headers-5.15.0-25-generic»
make: *** [Makefile:767: modules] Ошибка 2

[lwfinger]

Thanks for this report. The driver was doing
memcpy(btc->dm.run_reason, "None", BTC_RSN_MAXLEN);

instead of
memcpy(btc->dm.run_reason, "None", 5);

Counting the closing NULL, the string is a lot shorter than BTC_RSN_MAXLEN, which is defined as 32.

With this fix, the driver compiles cleanly, AND runs. I am using it now to send this message.

[Bloodlog]

Thanks;)