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| author | Zheyu Ma <zheyuma97@gmail.com> | 2022-07-29 19:02:16 +0800 |
|---|---|---|
| committer | Wolfram Sang <wsa@kernel.org> | 2022-12-07 21:27:08 +0100 |
| commit | 39244cc754829bf707dccd12e2ce37510f5b1f8d (patch) | |
| tree | df3caca1db0125ccbe45713ddfca3cf8abdfe455 /drivers/i2c/i2c-core-base.c | |
| parent | 2d47b79d2bd39cc6369eccf94a06568d84c906ae (diff) | |
i2c: ismt: Fix an out-of-bounds bug in ismt_access()
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: 13f35ac14cd0 ("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>
Diffstat (limited to 'drivers/i2c/i2c-core-base.c')
0 files changed, 0 insertions, 0 deletions