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USB: yurex: Check for truncation in yurex_read()

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[ Upstream commit 14427b86837a4baf1c121934c6599bdb67dfa9fc ]

snprintf() always returns the full length of the string it could have
printed, even if it was truncated because the buffer was too small.
So in case the counter value is truncated, we will over-read from
in_buffer and over-write to the caller's buffer.

I don't think it's actually possible for this to happen, but in case
truncation occurs, WARN and return -EIO.

Signed-off-by: Ben Hutchings <ben.hutchings@codethink.co.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Ben Hutchings 2018-08-15 21:45:37 +01:00 • committed by Greg Kroah-Hartman
parent 378ee25468
commit 6b63d77fbe
1 changed files with 3 additions and 0 deletions
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3
drivers/usb/misc/yurex.c
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@ -431,6 +431,9 @@ static ssize_t yurex_read(struct file *file, char __user *buffer, size_t count,
spin_unlock_irqrestore(&dev->lock, flags);
mutex_unlock(&dev->io_mutex);
if (WARN_ON_ONCE(len >= sizeof(in_buffer)))
return -EIO;
return simple_read_from_buffer(buffer, count, ppos, in_buffer, len);
}