On Fri, 14 Aug 2020 21:30:33 -0700 Guenter Roeck <[email protected]> wrote:
> On Fri, Aug 14, 2020 at 8:57 PM Phillip Lougher <[email protected]> > wrote: > > > > This is a regression introduced by the "migrate from ll_rw_block usage > > to BIO" patch. > > > > Bio_alloc() is limited to 256 pages (1 Mbyte). This can cause a > > failure when reading 1 Mbyte block filesystems. The problem is > > a datablock can be fully (or almost uncompressed), requiring 256 > > pages, but, because blocks are not aligned to page boundaries, it > > may require 257 pages to read. > > > > Bio_kmalloc() can handle 1024 pages, and so use this for the > > edge condition. > > > > Reported-by: Nicolas Prochazka <[email protected]> > > Reported-by: Tomoatsu Shimada <[email protected]> > > Signed-off-by: Phillip Lougher <[email protected]> > > Fixes: 93e72b3c612a ("squashfs: migrate from ll_rw_block usage to BIO") > Reviewed-by: Guenter Roeck <[email protected]> Thanks. I added cc:stable also.
