Avoid TOC-TOU bugs depending on how the compiler behaves.
Signed-off-by: Paolo Bonzini <pbonz...@redhat.com>
---
hw/scsi/megasas.c | 6 ++++--
1 file changed, 4 insertions(+), 2 deletions(-)
diff --git a/hw/scsi/megasas.c b/hw/scsi/megasas.c
index 804122a..1888118 100644
--- a/hw/scsi/megasas.c
+++ b/hw/scsi/megasas.c
@@ -309,9 +309,11 @@ static int megasas_build_sense(MegasasCmd *cmd, uint8_t
*sense_ptr,
PCIDevice *pcid = PCI_DEVICE(cmd->state);
uint32_t pa_hi = 0, pa_lo;
hwaddr pa;
+ int frame_sense_len;
- if (sense_len > cmd->frame->header.sense_len) {
- sense_len = cmd->frame->header.sense_len;
+ frame_sense_len = cmd->frame->header.sense_len;
+ if (sense_len > frame_sense_len) {
+ sense_len = frame_sense_len;
}
if (sense_len) {
pa_lo = le32_to_cpu(cmd->frame->pass.sense_addr_lo);
--
1.8.3.1
