Commit Message
Greg KH
Oct. 24, 2022, 11:30 a.m. UTC
From: Rustam Subkhankulov <subkhankulov@ispras.ru> [ Upstream commit 6ad4194d6a1e1d11b285989cd648ef695b4a93c0 ] If chromeos_laptop_prepare_i2c_peripherals() fails after allocating memory for 'cros_laptop->i2c_peripherals', this memory is freed at 'err_out' label and nonzero value is returned. Then chromeos_laptop_destroy() is called, resulting in double-free error. Found by Linux Verification Center (linuxtesting.org) with SVACE. Signed-off-by: Rustam Subkhankulov <subkhankulov@ispras.ru> Fixes: 5020cd29d8bf ("platform/chrome: chromeos_laptop - supply properties for ACPI devices") Reviewed-by: Dmitry Torokhov <dmitry.torokhov@gmail.com> Signed-off-by: Tzung-Bi Shih <tzungbi@kernel.org> Link: https://lore.kernel.org/r/20220813220843.2373004-1-subkhankulov@ispras.ru Signed-off-by: Sasha Levin <sashal@kernel.org> --- drivers/platform/chrome/chromeos_laptop.c | 24 ++++++++++++----------- 1 file changed, 13 insertions(+), 11 deletions(-)
diff --git a/drivers/platform/chrome/chromeos_laptop.c b/drivers/platform/chrome/chromeos_laptop.c index 24326eecd787..096e8e5b2cde 100644 --- a/drivers/platform/chrome/chromeos_laptop.c +++ b/drivers/platform/chrome/chromeos_laptop.c @@ -716,6 +716,7 @@ static int __init chromeos_laptop_prepare_i2c_peripherals(struct chromeos_laptop *cros_laptop, const struct chromeos_laptop *src) { + struct i2c_peripheral *i2c_peripherals; struct i2c_peripheral *i2c_dev; struct i2c_board_info *info; int i; @@ -724,17 +725,15 @@ chromeos_laptop_prepare_i2c_peripherals(struct chromeos_laptop *cros_laptop, if (!src->num_i2c_peripherals) return 0; - cros_laptop->i2c_peripherals = kmemdup(src->i2c_peripherals, - src->num_i2c_peripherals * - sizeof(*src->i2c_peripherals), - GFP_KERNEL); - if (!cros_laptop->i2c_peripherals) + i2c_peripherals = kmemdup(src->i2c_peripherals, + src->num_i2c_peripherals * + sizeof(*src->i2c_peripherals), + GFP_KERNEL); + if (!i2c_peripherals) return -ENOMEM; - cros_laptop->num_i2c_peripherals = src->num_i2c_peripherals; - - for (i = 0; i < cros_laptop->num_i2c_peripherals; i++) { - i2c_dev = &cros_laptop->i2c_peripherals[i]; + for (i = 0; i < src->num_i2c_peripherals; i++) { + i2c_dev = &i2c_peripherals[i]; info = &i2c_dev->board_info; error = chromeos_laptop_setup_irq(i2c_dev); @@ -752,16 +751,19 @@ chromeos_laptop_prepare_i2c_peripherals(struct chromeos_laptop *cros_laptop, } } + cros_laptop->i2c_peripherals = i2c_peripherals; + cros_laptop->num_i2c_peripherals = src->num_i2c_peripherals; + return 0; err_out: while (--i >= 0) { - i2c_dev = &cros_laptop->i2c_peripherals[i]; + i2c_dev = &i2c_peripherals[i]; info = &i2c_dev->board_info; if (info->properties) property_entries_free(info->properties); } - kfree(cros_laptop->i2c_peripherals); + kfree(i2c_peripherals); return error; }