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5d388fa01f
If a cell has 'nbits' equal to a multiple of BITS_PER_BYTE the logic
*p &= GENMASK((cell->nbits%BITS_PER_BYTE) - 1, 0);
will become undefined behavior because nbits modulo BITS_PER_BYTE is 0, and we
subtract one from that making a large number that is then shifted more than the
number of bits that fit into an unsigned long.
UBSAN reports this problem:
UBSAN: shift-out-of-bounds in drivers/nvmem/core.c:1386:8
shift exponent 64 is too large for 64-bit type 'unsigned long'
CPU: 6 PID: 7 Comm: kworker/u16:0 Not tainted 5.15.0-rc3+ #9
Hardware name: Google Lazor (rev3+) with KB Backlight (DT)
Workqueue: events_unbound deferred_probe_work_func
Call trace:
dump_backtrace+0x0/0x170
show_stack+0x24/0x30
dump_stack_lvl+0x64/0x7c
dump_stack+0x18/0x38
ubsan_epilogue+0x10/0x54
__ubsan_handle_shift_out_of_bounds+0x180/0x194
__nvmem_cell_read+0x1ec/0x21c
nvmem_cell_read+0x58/0x94
nvmem_cell_read_variable_common+0x4c/0xb0
nvmem_cell_read_variable_le_u32+0x40/0x100
a6xx_gpu_init+0x170/0x2f4
adreno_bind+0x174/0x284
component_bind_all+0xf0/0x264
msm_drm_bind+0x1d8/0x7a0
try_to_bring_up_master+0x164/0x1ac
__component_add+0xbc/0x13c
component_add+0x20/0x2c
dp_display_probe+0x340/0x384
platform_probe+0xc0/0x100
really_probe+0x110/0x304
__driver_probe_device+0xb8/0x120
driver_probe_device+0x4c/0xfc
__device_attach_driver+0xb0/0x128
bus_for_each_drv+0x90/0xdc
__device_attach+0xc8/0x174
device_initial_probe+0x20/0x2c
bus_probe_device+0x40/0xa4
deferred_probe_work_func+0x7c/0xb8
process_one_work+0x128/0x21c
process_scheduled_works+0x40/0x54
worker_thread+0x1ec/0x2a8
kthread+0x138/0x158
ret_from_fork+0x10/0x20
Fix it by making sure there are any bits to mask out.
Fixes:
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||
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.. | ||
bcm-ocotp.c | ||
brcm_nvram.c | ||
core.c | ||
imx-iim.c | ||
imx-ocotp-scu.c | ||
imx-ocotp.c | ||
jz4780-efuse.c | ||
Kconfig | ||
lpc18xx_eeprom.c | ||
lpc18xx_otp.c | ||
Makefile | ||
meson-efuse.c | ||
meson-mx-efuse.c | ||
mtk-efuse.c | ||
mxs-ocotp.c | ||
nintendo-otp.c | ||
qcom-spmi-sdam.c | ||
qfprom.c | ||
rave-sp-eeprom.c | ||
rmem.c | ||
rockchip-efuse.c | ||
rockchip-otp.c | ||
sc27xx-efuse.c | ||
snvs_lpgpr.c | ||
sprd-efuse.c | ||
stm32-romem.c | ||
sunxi_sid.c | ||
uniphier-efuse.c | ||
vf610-ocotp.c | ||
zynqmp_nvmem.c |