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| author | Alan Stern <stern@rowland.harvard.edu> | 2021-05-26 11:32:44 -0400 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2021-05-27 13:46:21 +0200 |
| commit | 7652dd2c5cb7b656471cc801d619fe24120643a3 (patch) | |
| tree | 1df0b0a80088856a1f208a792c41558d7c4e611d /net/ncsi | |
| parent | 61a140f08ebb2e9f06b7889463f7ee9c162d98c2 (diff) | |
USB: core: Check buffer length matches wLength for control transfers
A type of inconsistency that can show up in control URBs is when the
setup packet's wLength value does not match the URB's
transfer_buffer_length field. The two should always be equal;
differences could lead to information leaks or undefined behavior for
OUT transfers or overruns for IN transfers.
This patch adds a test for such mismatches during URB submission. If
the test fails, the submission is rejected with a -EBADR error code
(which is not used elsewhere in the USB core), and a debugging message
is logged for people interested in tracking down these errors.
Reviewed-by: Johan Hovold <johan@kernel.org>
Signed-off-by: Alan Stern <stern@rowland.harvard.edu>
Link: https://lore.kernel.org/r/20210526153244.GA1400430@rowland.harvard.edu
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'net/ncsi')
0 files changed, 0 insertions, 0 deletions