From: Nam Cao namcao@linutronix.de

mainline inclusion from mainline-v6.9-rc6 commit 9c0f59e47a90c54d0153f8ddc0f80d7a36207d0e category: bugfix bugzilla: https://gitee.com/src-openeuler/kernel/issues/I9QRN6 CVE: CVE-2024-35997

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?i...

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The flag I2C_HID_READ_PENDING is used to serialize I2C operations. However, this is not necessary, because I2C core already has its own locking for that.

More importantly, this flag can cause a lock-up: if the flag is set in i2c_hid_xfer() and an interrupt happens, the interrupt handler (i2c_hid_irq) will check this flag and return immediately without doing anything, then the interrupt handler will be invoked again in an infinite loop.

Since interrupt handler is an RT task, it takes over the CPU and the flag-clearing task never gets scheduled, thus we have a lock-up.

Delete this unnecessary flag.

Reported-and-tested-by: Eva Kurchatova nyandarknessgirl@gmail.com Closes: https://lore.kernel.org/r/CA+eeCSPUDpUg76ZO8dszSbAGn+UHjcyv8F1J-CUPVARAzEtW9... Fixes: 4a200c3b9a40 ("HID: i2c-hid: introduce HID over i2c specification implementation") Cc: stable@vger.kernel.org Signed-off-by: Nam Cao namcao@linutronix.de Signed-off-by: Jiri Kosina jkosina@suse.com Conflicts: drivers/hid/i2c-hid/i2c-hid-core.c [yyl: adjust context] Signed-off-by: Yang Yingliang yangyingliang@huawei.com --- drivers/hid/i2c-hid/i2c-hid-core.c | 8 -------- 1 file changed, 8 deletions(-)

diff --git a/drivers/hid/i2c-hid/i2c-hid-core.c b/drivers/hid/i2c-hid/i2c-hid-core.c index 14811d42a5a9..4f8e8f392dab 100644 --- a/drivers/hid/i2c-hid/i2c-hid-core.c +++ b/drivers/hid/i2c-hid/i2c-hid-core.c @@ -56,7 +56,6 @@ /* flags */ #define I2C_HID_STARTED 0 #define I2C_HID_RESET_PENDING 1 -#define I2C_HID_READ_PENDING 2

#define I2C_HID_PWR_ON 0x00 #define I2C_HID_PWR_SLEEP 0x01 @@ -256,7 +255,6 @@ static int __i2c_hid_command(struct i2c_client *client, msg[1].len = data_len; msg[1].buf = buf_recv; msg_num = 2; - set_bit(I2C_HID_READ_PENDING, &ihid->flags); }

if (wait) @@ -264,9 +262,6 @@ static int __i2c_hid_command(struct i2c_client *client,

ret = i2c_transfer(client->adapter, msg, msg_num);

- if (data_len > 0) - clear_bit(I2C_HID_READ_PENDING, &ihid->flags); - if (ret != msg_num) return ret < 0 ? ret : -EIO;

@@ -538,9 +533,6 @@ static irqreturn_t i2c_hid_irq(int irq, void *dev_id) { struct i2c_hid *ihid = dev_id;

- if (test_bit(I2C_HID_READ_PENDING, &ihid->flags)) - return IRQ_HANDLED; - i2c_hid_get_input(ihid);

return IRQ_HANDLED;