tpm_i2c_infineon: fix potential buffer overruns caused by bit glitches on the bus
authorJeremy Boone <>
Thu, 8 Feb 2018 20:30:01 +0000 (12:30 -0800)
committerJames Morris <>
Mon, 26 Feb 2018 23:43:44 +0000 (15:43 -0800)
Discrete TPMs are often connected over slow serial buses which, on
some platforms, can have glitches causing bit flips.  In all the
driver _recv() functions, we need to use a u32 to unmarshal the
response size, otherwise a bit flip of the 31st bit would cause the
expected variable to go negative, which would then try to read a huge
amount of data.  Also sanity check that the expected amount of data is
large enough for the TPM header.

Signed-off-by: Jeremy Boone <>
Signed-off-by: James Bottomley <>
Reviewed-by: Jarkko Sakkinen <>
Signed-off-by: Jarkko Sakkinen <>
Signed-off-by: James Morris <>

No differences found