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Niklas Schnelle 9660dcbe0d RDMA/mlx5: Fix number of allocated XLT entries 
In commit 8010d74b99 ("RDMA/mlx5: Split the WR setup out of
mlx5_ib_update_xlt()") the allocation logic was split out of
mlx5_ib_update_xlt() and the logic was changed to enable better OOM
handling. Sadly this change introduced a miscalculation of the number of
entries that were actually allocated when under memory pressure where it
can actually become 0 which on s390 lets dma_map_single() fail.

It can also lead to corruption of the free pages list when the wrong
number of entries is used in the calculation of sg->length which is used
as argument for free_pages().

Fix this by using the allocation size instead of misusing get_order(size).

Cc: stable@vger.kernel.org
Fixes: 8010d74b99 ("RDMA/mlx5: Split the WR setup out of mlx5_ib_update_xlt()")
Link: https://lore.kernel.org/r/20210908081849.7948-1-schnelle@linux.ibm.com
Signed-off-by: Niklas Schnelle <schnelle@linux.ibm.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
2021-09-08 08:31:10 -03:00
arch powerpc fixes for 5.14 #5 2021-08-15 06:57:43 -10:00
block block-5.14-2021-08-13 2021-08-13 13:36:42 -10:00
certs
crypto
Documentation Merge branch 'sg_nents' into rdma.git for-next 2021-08-30 09:49:59 -03:00
drivers RDMA/mlx5: Fix number of allocated XLT entries 2021-09-08 08:31:10 -03:00
fs libnvdimm fixes for v5.14-rc6 2021-08-14 19:46:39 -10:00
include Merge branch 'sg_nents' into rdma.git for-next 2021-08-30 09:49:59 -03:00
init
ipc
kernel A set of fixes for PCI/MSI and x86 interrupt startup: 2021-08-15 06:49:40 -10:00
lib lib/scatterlist: Fix wrong update of orig_nents 2021-08-24 19:52:40 -03:00
LICENSES
mm mm/memcg: fix incorrect flushing of lruvec data in obj_stock 2021-08-13 14:09:32 -10:00
net Merge tag 'ieee802154-for-davem-2021-08-12' of git://git.kernel.org/pub/scm/linux/kernel/git/sschmidt/wpan 2021-08-12 11:50:17 -07:00
samples
scripts Kbuild fixes for v5.14 (2nd) 2021-08-07 10:03:02 -07:00
security bpf: Add lockdown check for probe_write_user helper 2021-08-10 10:10:10 +02:00
sound sound fixes for 5.14-rc6 2021-08-12 07:06:40 -10:00
tools lib/scatterlist: Fix wrong update of orig_nents 2021-08-24 19:52:40 -03:00
usr
virt KVM: Do not leak memory for duplicate debugfs directories 2021-08-04 06:02:03 -04:00
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MAINTAINERS Merge branch 'sg_nents' into rdma.git for-next 2021-08-30 09:49:59 -03:00
Makefile Linux 5.14-rc6 2021-08-15 13:40:53 -10:00
README

README 

Linux kernel
============

There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.

In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``.  The formatted documentation can also be read online at:

    https://www.kernel.org/doc/html/latest/

There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.

Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.