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authorGustavo A. R. Silva <gustavoars@kernel.org>2022-01-20 02:38:03 +0300
committerJarkko Sakkinen <jarkko@kernel.org>2022-03-08 11:33:18 +0300
commit2dd634664d4128668c44bc9e497af24157f1eef4 (patch)
tree9945378cda1bf9fc68321d664f461d93b9b95068 /drivers/char
parent8bdc3e05cc78513b7495366ef9b962a3ea568e8e (diff)
downloadlinux-2dd634664d4128668c44bc9e497af24157f1eef4.tar.xz
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> Reviewed-by: Jarkko Sakkinen <jarkko@kernel.org> Signed-off-by: Jarkko Sakkinen <jarkko@kernel.org>
Diffstat (limited to 'drivers/char')
-rw-r--r--drivers/char/tpm/xen-tpmfront.c8
1 files 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)