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The at25 driver regressed in v5.17-rc1 due to a broken conflict
resolution: the allocation of the object was accidentally removed. Restore
it.
This was found when building under CONFIG_FORTIFY_SOURCE=y and
-Warray-bounds, which complained about strncpy() being used against an
empty object:
In function 'strncpy',
inlined from 'at25_fw_to_chip.constprop' at drivers/misc/eeprom/at25.c:312:2:
./include/linux/fortify-string.h:48:33: warning: '__builtin_strncpy' offset [0, 9] is out of the bounds [0, 0] [-Warray-bounds]
48 | #define __underlying_strncpy __builtin_strncpy
| ^
./include/linux/fortify-string.h:59:16: note: in expansion of macro '__underlying_strncpy'
59 | return __underlying_strncpy(p, q, size);
| ^~~~~~~~~~~~~~~~~~~~
In function 'strncpy',
inlined from 'at25_fram_to_chip' at drivers/misc/eeprom/at25.c:373:2,
inlined from 'at25_probe' at drivers/misc/eeprom/at25.c:453:10:
./include/linux/fortify-string.h:48:33: warning: '__builtin_strncpy' offset [0, 9] is out of the bounds [0, 0] [-Warray-bounds]
48 | #define __underlying_strncpy __builtin_strncpy
| ^
./include/linux/fortify-string.h:59:16: note: in expansion of macro '__underlying_strncpy'
59 | return __underlying_strncpy(p, q, size);
| ^~~~~~~~~~~~~~~~~~~~
Link: https://lore.kernel.org/lkml/CAHp75VdqK7h63fz-cPaQ2MGaVdaR2f1Fb5kKCZidUG3RwLsAVA@mail.gmail.com/
Fixes: af40d16042 ("Merge v5.15-rc5 into char-misc-next")
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Jiri Prchal <jiri.prchal@aksignal.cz>
Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>
Signed-off-by: Kees Cook <keescook@chromium.org>
Link: https://lore.kernel.org/r/20220118182003.3385019-1-keescook@chromium.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
a6501e4b38