From: Johan Hovold <johan+linaro@xxxxxxxxxx>
commit 9baa1415d9abdd1e08362ea2dcfadfacee8690b5 upstream.
Add the missing sanity check on the probed-session count to avoid
corrupting memory beyond the fixed-size slab-allocated session array
when there are more than FASTRPC_MAX_SESSIONS sessions defined in the
devicetree.
Fixes: f6f9279f2bf0 ("misc: fastrpc: Add Qualcomm fastrpc basic driver model")
Cc: stable@xxxxxxxxxxxxxxx # 5.1
Signed-off-by: Johan Hovold <johan+linaro@xxxxxxxxxx>
Link: https://lore.kernel.org/r/20220829080531.29681-2-johan+linaro@xxxxxxxxxx
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/misc/fastrpc.c | 5 +++++
1 file changed, 5 insertions(+)
--- a/drivers/misc/fastrpc.c
+++ b/drivers/misc/fastrpc.c
@@ -1943,6 +1943,11 @@ static int fastrpc_cb_probe(struct platf
of_property_read_u32(dev->of_node, "qcom,nsessions", &sessions);
spin_lock_irqsave(&cctx->lock, flags);
+ if (cctx->sesscount >= FASTRPC_MAX_SESSIONS) {
+ dev_err(&pdev->dev, "too many sessions\n");
+ spin_unlock_irqrestore(&cctx->lock, flags);
+ return -ENOSPC;
+ }
sess = &cctx->session[cctx->sesscount];
sess->used = false;
sess->valid = true;
