5.4-stable review patch. If anyone has any objections, please let me know.
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From: Dave Penkler dpenkler@gmail.com
commit cac01bd178d6a2a23727f138d647ce1a0e8a73a1 upstream.
wait_event_interruptible_timeout returns a long The return was being assigned to an int causing an integer overflow when the remaining jiffies > INT_MAX resulting in random error returns.
Use a long return value and convert to int ioctl return only on error.
When the return value of wait_event_interruptible_timeout was <= INT_MAX the number of remaining jiffies was returned which has no meaning for the user. Return 0 on success.
Reported-by: Michael Katzmann vk2bea@gmail.com Fixes: dbf3e7f654c0 ("Implement an ioctl to support the USMTMC-USB488 READ_STATUS_BYTE operation.") Cc: stable@vger.kernel.org Signed-off-by: Dave Penkler dpenkler@gmail.com Link: https://lore.kernel.org/r/20250502070941.31819-2-dpenkler@gmail.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/usb/class/usbtmc.c | 12 ++++++++---- 1 file changed, 8 insertions(+), 4 deletions(-)
--- a/drivers/usb/class/usbtmc.c +++ b/drivers/usb/class/usbtmc.c @@ -485,6 +485,7 @@ static int usbtmc488_ioctl_read_stb(stru u8 tag; __u8 stb; int rv; + long wait_rv;
dev_dbg(dev, "Enter ioctl_read_stb iin_ep_present: %d\n", data->iin_ep_present); @@ -527,16 +528,17 @@ static int usbtmc488_ioctl_read_stb(stru }
if (data->iin_ep_present) { - rv = wait_event_interruptible_timeout( + wait_rv = wait_event_interruptible_timeout( data->waitq, atomic_read(&data->iin_data_valid) != 0, file_data->timeout); - if (rv < 0) { - dev_dbg(dev, "wait interrupted %d\n", rv); + if (wait_rv < 0) { + dev_dbg(dev, "wait interrupted %ld\n", wait_rv); + rv = wait_rv; goto exit; }
- if (rv == 0) { + if (wait_rv == 0) { dev_dbg(dev, "wait timed out\n"); rv = -ETIMEDOUT; goto exit; @@ -556,6 +558,8 @@ static int usbtmc488_ioctl_read_stb(stru rv = put_user(stb, (__u8 __user *)arg); dev_dbg(dev, "stb:0x%02x received %d\n", (unsigned int)stb, rv);
+ rv = 0; + exit: /* bump interrupt bTag */ data->iin_bTag += 1;