Commit 2d6d260e authored by Oliver Neukum's avatar Oliver Neukum Committed by Greg Kroah-Hartman
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usb: mdc800: handle signal and read racing 



If a signal arrives after a read has partially completed,
we need to return the number of bytes read. -EINTR is correct
only if that number is zero.

Signed-off-by: default avatarOliver Neukum <oneukum@suse.com>
Cc: stable <stable@kernel.org>
Link: https://patch.msgid.link/20260209142048.1503791-1-oneukum@suse.com


Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 7a875c09

drivers/usb/image/mdc800.c

+1 −1
Original line number Diff line number Diff line
@@ -707,7 +707,7 @@ static ssize_t mdc800_device_read (struct file *file, char __user *buf, size_t l 
		if (signal_pending (current)) 

		{

			mutex_unlock(&mdc800->io_lock);

			return -EINTR;

			return len == left ? -EINTR : len-left;

		}



		sts=left > (mdc800->out_count-mdc800->out_ptr)?mdc800->out_count-mdc800->out_ptr:left;