mirror of https://github.com/torvalds/linux.git
03cd45d2e2
The driver does not populate .reg_read callback for the non-active NVMem
because the file is supposed to be write-only. However, it turns out
NVMem subsystem does not yet support this and expects that the .reg_read
callback is provided. If user reads the binary attribute it triggers
NULL pointer dereference like this one:
BUG: kernel NULL pointer dereference, address: 0000000000000000
...
Call Trace:
bin_attr_nvmem_read+0x64/0x80
kernfs_fop_read+0xa7/0x180
vfs_read+0xbd/0x170
ksys_read+0x5a/0xd0
do_syscall_64+0x43/0x150
entry_SYSCALL_64_after_hwframe+0x44/0xa9
Fix this in the driver by providing .reg_read callback that always
returns an error.
Reported-by: Nicholas Johnson <nicholas.johnson-opensource@outlook.com.au>
Fixes:
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|---|---|---|
| .. | ||
| Kconfig | ||
| Makefile | ||
| cap.c | ||
| ctl.c | ||
| ctl.h | ||
| dma_port.c | ||
| dma_port.h | ||
| domain.c | ||
| eeprom.c | ||
| icm.c | ||
| lc.c | ||
| nhi.c | ||
| nhi.h | ||
| nhi_ops.c | ||
| nhi_regs.h | ||
| path.c | ||
| property.c | ||
| switch.c | ||
| tb.c | ||
| tb.h | ||
| tb_msgs.h | ||
| tb_regs.h | ||
| tmu.c | ||
| tunnel.c | ||
| tunnel.h | ||
| usb4.c | ||
| xdomain.c | ||