4.7-stable review patch. If anyone has any objections, please let me know.
------------------
From: Bjorn Andersson <bjorn.andersson@xxxxxxxxxx>
commit 63af8e44eaa56ffe613628742a2642c4c2f1a029 upstream.
The valid_entries index should not be incremented until after we have
acquired the pointer to the value, or we will read and write data one
item off.
Fixes: 50e99641413e ("soc: qcom: smp2p: Qualcomm Shared Memory Point to Point")
Signed-off-by: Bjorn Andersson <bjorn.andersson@xxxxxxxxxx>
Signed-off-by: Andy Gross <andy.gross@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/soc/qcom/smp2p.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
--- a/drivers/soc/qcom/smp2p.c
+++ b/drivers/soc/qcom/smp2p.c
@@ -344,11 +344,12 @@ static int qcom_smp2p_outbound_entry(str
/* Allocate an entry from the smem item */
strlcpy(buf, entry->name, SMP2P_MAX_ENTRY_NAME);
memcpy_toio(out->entries[out->valid_entries].name, buf, SMP2P_MAX_ENTRY_NAME);
- out->valid_entries++;
/* Make the logical entry reference the physical value */
entry->value = &out->entries[out->valid_entries].value;
+ out->valid_entries++;
+
entry->state = qcom_smem_state_register(node, &smp2p_state_ops, entry);
if (IS_ERR(entry->state)) {
dev_err(smp2p->dev, "failed to register qcom_smem_state\n");
--
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