[PATCH 2/6] stm32mp: bsec: add check on null size in misc ops

[Patrick Delaunay]

Add a protection in misc bsec ops for request with null size.

For example OP-TEE error occurs when get_eth_nb() return 0 in
setup_mac_address() for unknown part number because U-Boot read 0 OTPs.

Signed-off-by: Patrick Delaunay <patrick.delaunay at foss.st.com>
---

 arch/arm/mach-stm32mp/bsec.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/arch/arm/mach-stm32mp/bsec.c b/arch/arm/mach-stm32mp/bsec.c
index f5f4b20d4776..0dc1e5c3fdc4 100644
--- a/arch/arm/mach-stm32mp/bsec.c
+++ b/arch/arm/mach-stm32mp/bsec.c
@@ -622,7 +622,7 @@ static int stm32mp_bsec_read(struct udevice *dev, int offset,
 		shadow = false;
 	}
 
-	if ((offs % 4) || (size % 4))
+	if ((offs % 4) || (size % 4) || !size)
 		return -EINVAL;
 
 	if (IS_ENABLED(CONFIG_OPTEE) && priv->tee) {
@@ -678,7 +678,7 @@ static int stm32mp_bsec_write(struct udevice *dev, int offset,
 		shadow = false;
 	}
 
-	if ((offs % 4) || (size % 4))
+	if ((offs % 4) || (size % 4) || !size)
 		return -EINVAL;
 
 	if (IS_ENABLED(CONFIG_OPTEE) && priv->tee) {
-- 
2.25.1