Messages in this thread Patch in this message | | | From | Greg Kroah-Hartman <> | Subject | [PATCH 5.10 653/717] spi: rpc-if: Fix use-after-free on unbind | Date | Mon, 28 Dec 2020 13:50:51 +0100 |
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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; }
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