Zheyu Ma 4a7bb1d93a i2c: ismt: Fix an out-of-bounds bug in ismt_access() ... [ Upstream commit 39244cc754 ] 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>		2023-01-07 12:07:26 +01:00
..
algos	i2c: algo: pca: Reapply i2c bus settings after reset	2020-09-23 08:46:15 +02:00
busses	i2c: ismt: Fix an out-of-bounds bug in ismt_access()	2023-01-07 12:07:26 +01:00
muxes	i2c: mux: demux-pinctrl: do not deactivate a master that is not active	2022-04-20 09:06:36 +02:00
Kconfig	…
Makefile	…
i2c-boardinfo.c	…
i2c-core.c	i2c: core: Disable client irq on reboot/shutdown	2021-07-20 16:21:12 +02:00
i2c-core.h	…
i2c-dev.c	i2c: dev: zero out array used for i2c reads from userspace	2021-08-26 08:37:22 -04:00
i2c-mux.c	…
i2c-slave-eeprom.c	…
i2c-smbus.c	…
i2c-stub.c	…