Chenxi Hou 2b14660c1c
mtd: jedec_probe: fix shift-out-of-bounds UB in JEDEC ID masking ...
UBSAN reports shift-out-of-bounds in jedec_read_mfr() and jedec_read_id():
UBSAN: shift-out-of-bounds in drivers/mtd/chips/jedec_probe.c:1924:13
shift exponent 32 is too large for 32-bit type 'int'
UBSAN: shift-out-of-bounds in drivers/mtd/chips/jedec_probe.c:1940:12
shift exponent 32 is too large for 32-bit type 'int'
The JEDEC manufacturer/device ID masking uses:
(1 << (cfi->device_type * 8)) - 1
When cfi->device_type is 4, this evaluates to 1 << 32. Since the
literal '1' has type int, this is a 32-bit shift and is undefined behavior.
Fix it by using a 64-bit literal (1ULL) so the shift is performed in a 64-bit type.
Co-developed-by: Hui Peng <benquike@gmail.com >
Signed-off-by: Hui Peng <benquike@gmail.com >
Co-developed-by: Zhihao Yao (Zephyr) <zhihao.yao@njit.edu >
Signed-off-by: Zhihao Yao (Zephyr) <zhihao.yao@njit.edu >
Signed-off-by: Chenxi Hou <ch395@njit.edu >
Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com >
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2b14660c1c