Sean reported that VS2019 build produce the following build error:
INFO - PvScsi.c
INFO - Generating code
INFO - d:\a\1\s\OvmfPkg\PvScsiDxe\PvScsi.c(459): error C2220: the
following warning is treated as an error
INFO - d:\a\1\s\OvmfPkg\PvScsiDxe\PvScsi.c(459): warning C4244: '=':
conversion from 'const UINT16' to 'UINT8', possible loss of data
This result from an implicit cast from PVSCSI Response->ScsiStatus
(Which is UINT16) to Packet->TargetResponse (Which is UINT8).
Fix this issue by adding an appropriate explicit cast and verify with
assert that this truncation do not result in loss of data.
Ref: https://bugzilla.tianocore.org/show_bug.cgi?id=2651
Reported-by: Sean Brogan <sean.brogan@microsoft.com>
Signed-off-by: Liran Alon <liran.alon@oracle.com>
Message-Id: <
20200331110452.51992-1-liran.alon@oracle.com>
Reviewed-by: Laszlo Ersek <lersek@redhat.com>
[lersek@redhat.com: rewrap VS2019 diags in commit msg for PatchCheck.py]
\r
//\r
// Report target status\r
+ // (Strangely, PVSCSI interface defines Response->ScsiStatus as UINT16.\r
+ // But it should de-facto always have a value that fits UINT8. To avoid\r
+ // unexpected behavior, verify value is in UINT8 bounds before casting)\r
//\r
- Packet->TargetStatus = Response->ScsiStatus;\r
+ ASSERT (Response->ScsiStatus <= MAX_UINT8);\r
+ Packet->TargetStatus = (UINT8)Response->ScsiStatus;\r
\r
//\r
// Host adapter status and function return value depend on\r