From: Dan Carpenter <dan.carpenter@oracle.com> stable inclusion from stable-5.10.80 commit dd189feebaf83849d220fefa39a1c2bfdbcd4406 bugzilla: 185821 https://gitee.com/openeuler/kernel/issues/I4L7CG Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=... -------------------------------- commit a0bcce2b2a169e10eb265c8f0ebdd5ae4c875670 upstream. 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> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Signed-off-by: Chen Jun <chenjun102@huawei.com> Reviewed-by: Weilong Chen <chenweilong@huawei.com> Acked-by: Weilong Chen <chenweilong@huawei.com> Signed-off-by: Chen Jun <chenjun102@huawei.com> Signed-off-by: Zheng Zengkai <zhengzengkai@huawei.com> --- drivers/char/tpm/tpm2-space.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/drivers/char/tpm/tpm2-space.c b/drivers/char/tpm/tpm2-space.c index 784b8b3cb903..97e916856cf3 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; -- 2.20.1