From: Lukas Wunner <lukas@xxxxxxxxx>
commit 7174dc655ef0578877b0b4598e69619d2be28b4d upstream.
If the call to devm_spi_register_master() fails on probe of the GPIO SPI
driver, the spi_master struct is erroneously not freed:
After allocating the spi_master, its reference count is 1. The driver
unconditionally decrements the reference count on unbind using a devm
action. Before calling devm_spi_register_master(), the driver
unconditionally increments the reference count because on success,
that function will decrement the reference count on unbind. However on
failure, devm_spi_register_master() does *not* decrement the reference
count, so the spi_master is leaked.
The issue was introduced by commits 8b797490b4db ("spi: gpio: Make sure
spi_master_put() is called in every error path") and 79567c1a321e ("spi:
gpio: Use devm_spi_register_master()"), which sought to plug leaks
introduced by 9b00bc7b901f ("spi: spi-gpio: Rewrite to use GPIO
descriptors") but missed this remaining leak.
The situation was later aggravated by commit d3b0ffa1d75d ("spi: gpio:
prevent memory leak in spi_gpio_probe"), which introduced a
use-after-free because it releases a reference on the spi_master if
devm_add_action_or_reset() fails even though the function already
does that.
Fix by switching over to the new devm_spi_alloc_master() helper.
Fixes: 9b00bc7b901f ("spi: spi-gpio: Rewrite to use GPIO descriptors")
Signed-off-by: Lukas Wunner <lukas@xxxxxxxxx>
Reviewed-by: Linus Walleij <linus.walleij@xxxxxxxxxx>
Cc: <stable@xxxxxxxxxxxxxxx> # v4.17+: 5e844cc37a5c: spi: Introduce device-managed SPI controller allocation
Cc: <stable@xxxxxxxxxxxxxxx> # v5.1-: 8b797490b4db: spi: gpio: Make sure spi_master_put() is called in every error path
Cc: <stable@xxxxxxxxxxxxxxx> # v5.1-: 45beec351998: spi: bitbang: Introduce spi_bitbang_init()
Cc: <stable@xxxxxxxxxxxxxxx> # v5.1-: 79567c1a321e: spi: gpio: Use devm_spi_register_master()
Cc: <stable@xxxxxxxxxxxxxxx> # v5.4-: d3b0ffa1d75d: spi: gpio: prevent memory leak in spi_gpio_probe
Cc: <stable@xxxxxxxxxxxxxxx> # v4.17+
Cc: Navid Emamdoost <navid.emamdoost@xxxxxxxxx>
Cc: Andrey Smirnov <andrew.smirnov@xxxxxxxxx>
Link: https://lore.kernel.org/r/86eaed27431c3d709e3748eb76ceecbfc790dd37.1607286887.git.lukas@xxxxxxxxx
Signed-off-by: Mark Brown <broonie@xxxxxxxxxx>
[lukas: backport to v4.19.192]
Signed-off-by: Lukas Wunner <lukas@xxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/spi/spi-gpio.c | 8 ++------
1 file changed, 2 insertions(+), 6 deletions(-)
--- a/drivers/spi/spi-gpio.c
+++ b/drivers/spi/spi-gpio.c
@@ -382,7 +382,7 @@ static int spi_gpio_probe(struct platfor
return -ENODEV;
#endif
- master = spi_alloc_master(&pdev->dev, sizeof(*spi_gpio));
+ master = devm_spi_alloc_master(&pdev->dev, sizeof(*spi_gpio));
if (!master)
return -ENOMEM;
@@ -438,11 +438,7 @@ static int spi_gpio_probe(struct platfor
}
spi_gpio->bitbang.setup_transfer = spi_bitbang_setup_transfer;
- status = spi_bitbang_start(&spi_gpio->bitbang);
- if (status)
- spi_master_put(master);
-
- return status;
+ return spi_bitbang_start(&spi_gpio->bitbang);
}
static int spi_gpio_remove(struct platform_device *pdev)
