[PATCH v2 4/5] gpu: nova-core: use checked arithmetic in BinFirmware::data

[Joel Fernandes]

Use checked_add() when computing the firmware data end offset in the
BinFirmware::data() method. The data_offset and data_size fields come
from the BinHdr structure parsed from the firmware file header.

Reviewed-by: Zhi Wang <zhiw at nvidia.com>
Signed-off-by: Joel Fernandes <joelagnelf at nvidia.com>
---
 drivers/gpu/nova-core/firmware.rs | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/nova-core/firmware.rs b/drivers/gpu/nova-core/firmware.rs
index 68779540aa28..4f57a270e142 100644
--- a/drivers/gpu/nova-core/firmware.rs
+++ b/drivers/gpu/nova-core/firmware.rs
@@ -394,8 +394,9 @@ fn new(fw: &'a firmware::Firmware) -> Result<Self> {
     fn data(&self) -> Option<&[u8]> {
         let fw_start = usize::from_safe_cast(self.hdr.data_offset);
         let fw_size = usize::from_safe_cast(self.hdr.data_size);
+        let fw_end = fw_start.checked_add(fw_size)?;
 
-        self.fw.get(fw_start..fw_start + fw_size)
+        self.fw.get(fw_start..fw_end)
     }
 }
 
-- 
2.34.1