[PATCH 5.10 653/717] spi: rpc-if: Fix use-after-free on unbind

Greg Kroah-Hartman
2020-12-28T14:39:16Z

From: Lukas Wunner <lukas@wunner.de>

commit 393f981ca5f797b58b882d42b7621fb6e43c7f5b upstream.

rpcif_spi_remove() accesses the driver's private data after calling
spi_unregister_controller() even though that function releases the last
reference on the spi_controller and thereby frees the private data.

Fix by switching over to the new devm_spi_alloc_master() helper which
keeps the private data accessible until the driver has unbound.

Fixes: eb8d6d464a27 ("spi: add Renesas RPC-IF driver")
Signed-off-by: Lukas Wunner <lukas@wunner.de>
Cc: <stable@vger.kernel.org> # v5.9+: 5e844cc37a5c: spi: Introduce device-managed SPI controller allocation
Cc: <stable@vger.kernel.org> # v5.9+
Cc: Sergei Shtylyov <s.shtylyov@omprussia.ru>
Link: https://lore.kernel.org/r/c5da472c28021da2f6517441685cef033d40b140.1607286887.git.lukas@wunner.de
Signed-off-by: Mark Brown <broonie@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
drivers/spi/spi-rpc-if.c | 9 ++-------
1 file changed, 2 insertions(+), 7 deletions(-)

--- a/drivers/spi/spi-rpc-if.c
+++ b/drivers/spi/spi-rpc-if.c
@@ -134,7 +134,7 @@ static int rpcif_spi_probe(struct platfo
struct rpcif *rpc;
int error;

- ctlr = spi_alloc_master(&pdev->dev, sizeof(*rpc));
+ ctlr = devm_spi_alloc_master(&pdev->dev, sizeof(*rpc));
if (!ctlr)
return -ENOMEM;

@@ -159,13 +159,8 @@ static int rpcif_spi_probe(struct platfo
error = spi_register_controller(ctlr);
if (error) {
dev_err(&pdev->dev, "spi_register_controller failed\n");
- goto err_put_ctlr;
+ rpcif_disable_rpm(rpc);
}
- return 0;
-
-err_put_ctlr:
- rpcif_disable_rpm(rpc);
- spi_controller_put(ctlr);

return error;
}