From: Daniel Okazaki dtokazaki@google.com

stable inclusion from stable-v6.6.31 commit 2af84c46b9b8f2d6c0f88d09ee5c849ae1734676 category: bugfix bugzilla: https://gitee.com/src-openeuler/kernel/issues/I9Q9F4 CVE: CVE-2024-35848

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=...

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[ Upstream commit f42c97027fb75776e2e9358d16bf4a99aeb04cf2 ]

If the eeprom is not accessible, an nvmem device will be registered, the read will fail, and the device will be torn down. If another driver accesses the nvmem device after the teardown, it will reference invalid memory.

Move the failure point before registering the nvmem device.

Signed-off-by: Daniel Okazaki dtokazaki@google.com Fixes: b20eb4c1f026 ("eeprom: at24: drop unnecessary label") Cc: stable@vger.kernel.org Link: https://lore.kernel.org/r/20240422174337.2487142-1-dtokazaki@google.com Signed-off-by: Bartosz Golaszewski bartosz.golaszewski@linaro.org Signed-off-by: Sasha Levin sashal@kernel.org Signed-off-by: Wenyu Huang huangwenyu5@huawei.com --- drivers/misc/eeprom/at24.c | 18 +++++++++--------- 1 file changed, 9 insertions(+), 9 deletions(-)

diff --git a/drivers/misc/eeprom/at24.c b/drivers/misc/eeprom/at24.c index dbbf7db4ff2f..1dd556496f27 100644 --- a/drivers/misc/eeprom/at24.c +++ b/drivers/misc/eeprom/at24.c @@ -756,15 +756,6 @@ static int at24_probe(struct i2c_client *client) } pm_runtime_enable(dev);

- at24->nvmem = devm_nvmem_register(dev, &nvmem_config); - if (IS_ERR(at24->nvmem)) { - pm_runtime_disable(dev); - if (!pm_runtime_status_suspended(dev)) - regulator_disable(at24->vcc_reg); - return dev_err_probe(dev, PTR_ERR(at24->nvmem), - "failed to register nvmem\n"); - } - /* * Perform a one-byte test read to verify that the chip is functional, * unless powering on the device is to be avoided during probe (i.e. @@ -780,6 +771,15 @@ static int at24_probe(struct i2c_client *client) } }

+ at24->nvmem = devm_nvmem_register(dev, &nvmem_config); + if (IS_ERR(at24->nvmem)) { + pm_runtime_disable(dev); + if (!pm_runtime_status_suspended(dev)) + regulator_disable(at24->vcc_reg); + return dev_err_probe(dev, PTR_ERR(at24->nvmem), + "failed to register nvmem\n"); + } + pm_runtime_idle(dev);

if (writable)