This is a note to let you know that I've just added the patch titled tpm_crb: check for bad response size to the 4.9-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary The filename of the patch is: tpm_crb-check-for-bad-response-size.patch and it can be found in the queue-4.9 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable@xxxxxxxxxxxxxxx> know about it. >From 8569defde8057258835c51ce01a33de82e14b148 Mon Sep 17 00:00:00 2001 From: Jerry Snitselaar <jsnitsel@xxxxxxxxxx> Date: Fri, 10 Mar 2017 17:46:04 -0700 Subject: tpm_crb: check for bad response size From: Jerry Snitselaar <jsnitsel@xxxxxxxxxx> commit 8569defde8057258835c51ce01a33de82e14b148 upstream. Make sure size of response buffer is at least 6 bytes, or we will underflow and pass large size_t to memcpy_fromio(). This was encountered while testing earlier version of locality patchset. Fixes: 30fc8d138e912 ("tpm: TPM 2.0 CRB Interface") Signed-off-by: Jerry Snitselaar <jsnitsel@xxxxxxxxxx> Reviewed-by: Jarkko Sakkinen <jarkko.sakkinen@xxxxxxxxxxxxxxx> Signed-off-by: Jarkko Sakkinen <jarkko.sakkinen@xxxxxxxxxxxxxxx> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- drivers/char/tpm/tpm_crb.c | 3 +-- 1 file changed, 1 insertion(+), 2 deletions(-) --- a/drivers/char/tpm/tpm_crb.c +++ b/drivers/char/tpm/tpm_crb.c @@ -111,8 +111,7 @@ static int crb_recv(struct tpm_chip *chi memcpy_fromio(buf, priv->rsp, 6); expected = be32_to_cpup((__be32 *) &buf[2]); - - if (expected > count) + if (expected > count || expected < 6) return -EIO; memcpy_fromio(&buf[6], &priv->rsp[6], expected - 6); Patches currently in stable-queue which might be from jsnitsel@xxxxxxxxxx are queue-4.9/tpm_crb-check-for-bad-response-size.patch