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>

0 files changed, 0 insertions, 0 deletions