[PATCH v5 1/2] lib/mpi: Fix buffer overrun when SG is too long

[Eric Biggers]

On Tue, Dec 27, 2022 at 03:27:39PM +0100, Roberto Sassu wrote:
> From: Herbert Xu <herbert at gondor.apana.org.au>
> 
> The helper mpi_read_raw_from_sgl sets the number of entries in
> the SG list according to nbytes.  However, if the last entry
> in the SG list contains more data than nbytes, then it may overrun
> the buffer because it only allocates enough memory for nbytes.
> 
> Fixes: 2d4d1eea540b ("lib/mpi: Add mpi sgl helpers")
> Reported-by: Roberto Sassu <roberto.sassu at huaweicloud.com>
> Signed-off-by: Herbert Xu <herbert at gondor.apana.org.au>
> ---
>  lib/mpi/mpicoder.c | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)

Reviewed-by: Eric Biggers <ebiggers at google.com>

- Eric