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| author | Dan Carpenter <dan.carpenter@oracle.com> | 2021-09-08 08:33:57 +0300 |
|---|---|---|
| committer | Jarkko Sakkinen <jarkko@kernel.org> | 2021-10-26 05:03:33 +0300 |
| commit | a0bcce2b2a169e10eb265c8f0ebdd5ae4c875670 (patch) | |
| tree | c569785c1419f682322e7633bbf929054d90f3f4 /drivers/char/tpm | |
| parent | 4091c004283bc65d2478fbfc9f2521fcb5af1f96 (diff) | |
| download | linux-a0bcce2b2a169e10eb265c8f0ebdd5ae4c875670.tar.gz | |
tpm: Check for integer overflow in tpm2_map_response_body()
The "4 * be32_to_cpu(data->count)" multiplication can potentially
overflow which would lead to memory corruption. Add a check for that.
Cc: stable@vger.kernel.org
Fixes: 745b361e989a ("tpm: infrastructure for TPM spaces")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Reviewed-by: Jarkko Sakkinen <jarkko@kernel.org>
Signed-off-by: Jarkko Sakkinen <jarkko@kernel.org>
Diffstat (limited to 'drivers/char/tpm')
| -rw-r--r-- | drivers/char/tpm/tpm2-space.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/drivers/char/tpm/tpm2-space.c b/drivers/char/tpm/tpm2-space.c index 784b8b3cb903f..97e916856cf3e 100644 --- a/drivers/char/tpm/tpm2-space.c +++ b/drivers/char/tpm/tpm2-space.c @@ -455,6 +455,9 @@ static int tpm2_map_response_body(struct tpm_chip *chip, u32 cc, u8 *rsp, if (be32_to_cpu(data->capability) != TPM2_CAP_HANDLES) return 0; + if (be32_to_cpu(data->count) > (UINT_MAX - TPM_HEADER_SIZE - 9) / 4) + return -EFAULT; + if (len != TPM_HEADER_SIZE + 9 + 4 * be32_to_cpu(data->count)) return -EFAULT; |