From: Daniel Okazaki dtokazaki@google.com

stable inclusion from stable-v5.10.159 commit c850f71fca09ea41800ed55905980063d17e01da 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/?h=l...

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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 | 16 ++++++++-------- 1 file changed, 8 insertions(+), 8 deletions(-)

diff --git a/drivers/misc/eeprom/at24.c b/drivers/misc/eeprom/at24.c index 305ffad131a2..c43072b2e9b6 100644 --- a/drivers/misc/eeprom/at24.c +++ b/drivers/misc/eeprom/at24.c @@ -757,14 +757,6 @@ static int at24_probe(struct i2c_client *client) pm_runtime_set_active(dev); 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 PTR_ERR(at24->nvmem); - } - /* * Perform a one-byte test read to verify that the * chip is functional. @@ -777,6 +769,14 @@ static int at24_probe(struct i2c_client *client) return -ENODEV; }

+ 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 PTR_ERR(at24->nvmem); + } + pm_runtime_idle(dev);

if (writable)