Re: [PATCH v3/resubmit 1/3] staging: gs_fpgaboot: add buffer overflow checks

[Greg Kroah-Hartman]

On Wed, Jul 26, 2017 at 09:13:57PM -0400, Jacob von Chorus wrote:
> Four fields in struct fpgaimage are char arrays of length MAX_STR (256).
> The amount of data read into these buffers is controlled by a length
> field in the bitstream file read from userspace. If a corrupt or
> malicious firmware file was supplied, kernel data beyond these buffers
> can be overwritten arbitrarily.
> 
> This patch adds a check of the bitstream's length value to ensure it
> fits within the bounds of the allocated buffers. An error condition is
> returned from gs_read_bitstream if any of the reads fail.
> 
> Signed-off-by: Jacob von Chorus <jacobvonchorus@xxxxxxxxxx>
> 
> v3:
> - use >= to prevent an integer overflow in the comparison
> - use get_unaligned_be functions to interpret length fields
> - fix remainder of file to use valid error codes
> 
> v2:
> - char arrays converted to u8 arrays
> - replace error return value with proper error code in
> 	gs_read_bitstream
> ---

All of the v2: and such needs to go below the --- line, as
Documentation/SubmittingPatches says to do.

Please fix that up and resend the series.

thanks,

greg k-h