Zheyu Ma 03b7ef7a6c i2c: ismt: Fix an out-of-bounds bug in ismt_access() ... [ Upstream commit 39244cc754829bf707dccd12e2ce37510f5b1f8d ] When the driver does not check the data from the user, the variable 'data->block[0]' may be very large to cause an out-of-bounds bug. The following log can reveal it: [ 33.995542] i2c i2c-1: ioctl, cmd=0x720, arg=0x7ffcb3dc3a20 [ 33.995978] ismt_smbus 0000:00:05.0: I2C_SMBUS_BLOCK_DATA: WRITE [ 33.996475] ================================================================== [ 33.996995] BUG: KASAN: out-of-bounds in ismt_access.cold+0x374/0x214b [ 33.997473] Read of size 18446744073709551615 at addr ffff88810efcfdb1 by task ismt_poc/485 [ 33.999450] Call Trace: [ 34.001849] memcpy+0x20/0x60 [ 34.002077] ismt_access.cold+0x374/0x214b [ 34.003382] __i2c_smbus_xfer+0x44f/0xfb0 [ 34.004007] i2c_smbus_xfer+0x10a/0x390 [ 34.004291] i2cdev_ioctl_smbus+0x2c8/0x710 [ 34.005196] i2cdev_ioctl+0x5ec/0x74c Fix this bug by checking the size of 'data->block[0]' first. Fixes: 13f35ac14c ("i2c: Adding support for Intel iSMT SMBus 2.0 host controller") Signed-off-by: Zheyu Ma <zheyuma97@gmail.com> Signed-off-by: Wolfram Sang <wsa@kernel.org> Signed-off-by: Sasha Levin <sashal@kernel.org>		2023-01-18 09:26:25 +01:00
..
algos	i2c: algo: pca: Reapply i2c bus settings after reset	2020-09-23 10:46:34 +02:00
busses	i2c: ismt: Fix an out-of-bounds bug in ismt_access()	2023-01-18 09:26:25 +01:00
muxes	i2c: mux-gpmux: Add of_node_put() when breaking out of loop	2022-08-25 11:11:20 +02:00
i2c-boardinfo.c
i2c-core-acpi.c	i2c: acpi: fix resource leak in reconfiguration device addition	2021-10-17 10:08:33 +02:00
i2c-core-base.c	i2c: Fix a potential use after free	2022-08-25 11:11:16 +02:00
i2c-core-of.c	i2c: core: fix use after free in of_i2c_notify	2019-12-17 20:37:32 +01:00
i2c-core-slave.c	i2c: slave: add sanity check when unregistering	2020-08-21 09:47:59 +02:00
i2c-core-smbus.c
i2c-core.h
i2c-dev.c	i2c: dev: prevent ZERO_SIZE_PTR deref in i2cdev_ioctl_rdwr()	2022-10-26 13:16:51 +02:00
i2c-mux.c
i2c-slave-eeprom.c
i2c-smbus.c
i2c-stub.c
Kconfig
Makefile