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Subject[PATCH][next] tpm: xen-tpmfront: Use struct_size() helper
Make use of the struct_size() helper instead of an open-coded version,
in order to avoid any potential type mistakes or integer overflows that,
in the worse scenario, could lead to heap overflows.

Also, address the following sparse warning:
drivers/char/tpm/xen-tpmfront.c:131:16: warning: using sizeof on a flexible structure

Link: https://github.com/KSPP/linux/issues/160
Link: https://github.com/KSPP/linux/issues/174
Signed-off-by: Gustavo A. R. Silva <gustavoars@kernel.org>
---
drivers/char/tpm/xen-tpmfront.c | 8 ++++----
1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/drivers/char/tpm/xen-tpmfront.c b/drivers/char/tpm/xen-tpmfront.c
index da5b30771418..f53e0cf1ec7e 100644
--- a/drivers/char/tpm/xen-tpmfront.c
+++ b/drivers/char/tpm/xen-tpmfront.c
@@ -126,16 +126,16 @@ static void vtpm_cancel(struct tpm_chip *chip)
notify_remote_via_evtchn(priv->evtchn);
}

-static unsigned int shr_data_offset(struct vtpm_shared_page *shr)
+static size_t shr_data_offset(struct vtpm_shared_page *shr)
{
- return sizeof(*shr) + sizeof(u32) * shr->nr_extra_pages;
+ return struct_size(shr, extra_pages, shr->nr_extra_pages);
}

static int vtpm_send(struct tpm_chip *chip, u8 *buf, size_t count)
{
struct tpm_private *priv = dev_get_drvdata(&chip->dev);
struct vtpm_shared_page *shr = priv->shr;
- unsigned int offset = shr_data_offset(shr);
+ size_t offset = shr_data_offset(shr);

u32 ordinal;
unsigned long duration;
@@ -177,7 +177,7 @@ static int vtpm_recv(struct tpm_chip *chip, u8 *buf, size_t count)
{
struct tpm_private *priv = dev_get_drvdata(&chip->dev);
struct vtpm_shared_page *shr = priv->shr;
- unsigned int offset = shr_data_offset(shr);
+ size_t offset = shr_data_offset(shr);
size_t length = shr->length;

if (shr->state == VTPM_STATE_IDLE)
--
2.27.0
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