31 lines
1.1 KiB
Diff
31 lines
1.1 KiB
Diff
From: Paolo Bonzini <pbonzini@redhat.com>
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Date: Thu, 1 Jun 2017 17:18:39 +0200
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Subject: [PATCH] megasas: do not read sense length more than once from frame
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Avoid TOC-TOU bugs depending on how the compiler behaves.
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Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
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(cherry picked from commit 134550bf81a026e18cf58b81e2c2cceaf516f92e)
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---
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hw/scsi/megasas.c | 6 ++++--
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1 file changed, 4 insertions(+), 2 deletions(-)
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diff --git a/hw/scsi/megasas.c b/hw/scsi/megasas.c
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index 804122ab05..1888118e5f 100644
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--- a/hw/scsi/megasas.c
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+++ b/hw/scsi/megasas.c
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@@ -309,9 +309,11 @@ static int megasas_build_sense(MegasasCmd *cmd, uint8_t *sense_ptr,
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PCIDevice *pcid = PCI_DEVICE(cmd->state);
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uint32_t pa_hi = 0, pa_lo;
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hwaddr pa;
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+ int frame_sense_len;
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- if (sense_len > cmd->frame->header.sense_len) {
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- sense_len = cmd->frame->header.sense_len;
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+ frame_sense_len = cmd->frame->header.sense_len;
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+ if (sense_len > frame_sense_len) {
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+ sense_len = frame_sense_len;
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}
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if (sense_len) {
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pa_lo = le32_to_cpu(cmd->frame->pass.sense_addr_lo);
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