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| author | Anton Vasilyev <vasilyev@ispras.ru> | 2018-07-23 19:53:30 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2018-09-26 08:33:54 +0200 |
| commit | d8596403ebd873c7c47229939a423f8d431a96be (patch) | |
| tree | 8cd5eee8091d87cd8648088277a0defe51f3d8c2 /drivers/gpio | |
| parent | 04924815bdc2a86e2a94b254397744712187352e (diff) | |
| download | linux-stable-d8596403ebd873c7c47229939a423f8d431a96be.tar.gz linux-stable-d8596403ebd873c7c47229939a423f8d431a96be.tar.bz2 linux-stable-d8596403ebd873c7c47229939a423f8d431a96be.zip | |
gpio: ml-ioh: Fix buffer underwrite on probe error path
[ Upstream commit 4bf4eed44bfe288f459496eaf38089502ef91a79 ]
If ioh_gpio_probe() fails on devm_irq_alloc_descs() then chip may point
to any element of chip_save array, so reverse iteration from pointer chip
may become chip_save[-1] and gpiochip_remove() will operate with wrong
memory.
The patch fix the error path of ioh_gpio_probe() to correctly bypass
chip_save array.
Found by Linux Driver Verification project (linuxtesting.org).
Signed-off-by: Anton Vasilyev <vasilyev@ispras.ru>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/gpio')
| -rw-r--r-- | drivers/gpio/gpio-ml-ioh.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/drivers/gpio/gpio-ml-ioh.c b/drivers/gpio/gpio-ml-ioh.c index 5536108aa9db..fe21734bbe5c 100644 --- a/drivers/gpio/gpio-ml-ioh.c +++ b/drivers/gpio/gpio-ml-ioh.c @@ -495,9 +495,10 @@ err_irq_alloc_descs: chip = chip_save; err_gpiochip_add: + chip = chip_save; while (--i >= 0) { - chip--; gpiochip_remove(&chip->gpio); + chip++; } kfree(chip_save); |