tree 45f0b776d4f9497e793cbfa1f0afe59e85606004
parent 965ab29ba09d75056a6c9b0f707cd1c2cc91188f
author Ian Abbott <abbotti@mev.co.uk> 1415291019 +0000
committer Greg Kroah-Hartman <gregkh@linuxfoundation.org> 1415384806 -0800

misc: genwqe: check for error from get_user_pages_fast()

`genwqe_user_vmap()` calls `get_user_pages_fast()` and if the return
value is less than the number of pages requested, it frees the pages and
returns an error (`-EFAULT`).  However, it fails to consider a negative
error return value from `get_user_pages_fast()`.  In that case, the test
`if (rc < m->nr_pages)` will be false (due to promotion of `rc` to a
large `unsigned int`) and the code will continue on to call
`genwqe_map_pages()` with an invalid list of page pointers.  Fix it by
bailing out if `get_user_pages_fast()` returns a negative error value.

Signed-off-by: Ian Abbott <abbotti@mev.co.uk>
Cc: <stable@vger.kernel.org> # 3.14.x # 3.15.x # 3.16.x # 3.17.x
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>