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Helge Deller cb8aa5b92a scsi: mpt3sas: Fix out-of-bounds compiler warning 
[ Upstream commit 120f1d95ef ]

I'm facing this warning when building for the parisc64 architecture:

drivers/scsi/mpt3sas/mpt3sas_base.c: In function ‘_base_make_ioc_operational’:
drivers/scsi/mpt3sas/mpt3sas_base.c:5396:40: warning: array subscript ‘Mpi2SasIOUnitPage1_t {aka struct _MPI2_CONFIG_PAGE_SASIOUNIT_1}[0]’ is partly outside array bounds of ‘unsigned char[20]’ [-Warray-bounds]
 5396 |             (le16_to_cpu(sas_iounit_pg1->SASWideMaxQueueDepth)) ?
drivers/scsi/mpt3sas/mpt3sas_base.c:5382:26: note: referencing an object of size 20 allocated by ‘kzalloc’
 5382 |         sas_iounit_pg1 = kzalloc(sz, GFP_KERNEL);
      |                          ^~~~~~~~~~~~~~~~~~~~~~~

The problem is, that only 20 bytes are allocated with kmalloc(), which is
sufficient to hold the bytes which are needed.  Nevertheless, gcc complains
because the whole Mpi2SasIOUnitPage1_t struct is 32 bytes in size and thus
doesn't fit into those 20 bytes.

This patch simply allocates all 32 bytes (instead of 20) and thus avoids
the warning. There is no functional change introduced by this patch.

While touching the code I cleaned up to calculation of max_wideport_qd,
max_narrowport_qd and max_sata_qd to make it easier readable.

Test successfully tested on a HP C8000 PA-RISC workstation with 64-bit
kernel.

Link: https://lore.kernel.org/r/YpZ197iZdDZSCzrT@p100
Signed-off-by: Helge Deller <deller@gmx.de>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
2022-06-22 14:21:57 +02:00
arch powerpc/kasan: Silence KASAN warnings in __get_wchan() 2022-06-22 14:21:55 +02:00
block block: make bioset_exit() fully resilient against being called twice 2022-06-14 18:36:11 +02:00
certs certs: Add support for using elliptic curve keys for signing modules 2021-08-23 19:55:42 +03:00
crypto crypto: cryptd - Protect per-CPU resource by disabling BH. 2022-06-09 10:23:11 +02:00
Documentation x86/speculation/mmio: Add sysfs reporting for Processor MMIO Stale Data 2022-06-16 13:30:33 +02:00
drivers scsi: mpt3sas: Fix out-of-bounds compiler warning 2022-06-22 14:21:57 +02:00
fs quota: Prevent memory allocation recursion while holding dq_lock 2022-06-22 14:21:56 +02:00
include x86/speculation/mmio: Add sysfs reporting for Processor MMIO Stale Data 2022-06-16 13:30:33 +02:00
init Kconfig: Add option for asm goto w/ tied outputs to workaround clang-13 bug 2022-06-09 10:23:26 +02:00
ipc ipc/mqueue: use get_tree_nodev() in mqueue_get_tree() 2022-06-09 10:23:10 +02:00
kernel dma-debug: make things less spammy under memory pressure 2022-06-22 14:21:55 +02:00
lib iov_iter: fix build issue due to possible type mis-match 2022-06-14 18:36:28 +02:00
LICENSES LICENSES/dual/CC-BY-4.0: Git rid of "smart quotes" 2021-07-15 06:31:24 -06:00
mm mm/memremap: fix missing call to untrack_pfn() in pagemap_range() 2022-06-09 10:23:28 +02:00
net xsk: Fix possible crash when multiple sockets are created 2022-06-14 18:36:28 +02:00
samples samples/landlock: Format with clang-format 2022-06-09 10:23:23 +02:00
scripts scripts/gdb: change kernel config dumping method 2022-06-14 18:36:24 +02:00
security KEYS: trusted: tpm2: Fix migratable logic 2022-06-14 18:36:25 +02:00
sound ASoC: wm_adsp: Fix event generation for wm_adsp_fw_put() 2022-06-22 14:21:56 +02:00
tools KVM: x86/speculation: Disable Fill buffer clear within guests 2022-06-16 13:30:34 +02:00
usr usr/include/Makefile: add linux/nfc.h to the compile-test coverage 2022-02-01 17:27:15 +01:00
virt KVM: avoid NULL pointer dereference in kvm_dirty_ring_push 2022-04-13 20:59:26 +02:00
.clang-format clang-format: Update with the latest for_each macro list 2021-05-12 23:32:39 +02:00
.cocciconfig
.get_maintainer.ignore Opt out of scripts/get_maintainer.pl 2019-05-16 10:53:40 -07:00
.gitattributes .gitattributes: use 'dts' diff driver for dts files 2019-12-04 19:44:11 -08:00
.gitignore .gitignore: ignore only top-level modules.builtin 2021-05-02 00:43:35 +09:00
.mailmap mailmap: add Andrej Shadura 2021-10-18 20:22:03 -10:00
COPYING COPYING: state that all contributions really are covered by this file 2020-02-10 13:32:20 -08:00
CREDITS MAINTAINERS: Move Daniel Drake to credits 2021-09-21 08:34:58 +03:00
Kbuild kbuild: rename hostprogs-y/always to hostprogs/always-y 2020-02-04 01:53:07 +09:00
Kconfig kbuild: ensure full rebuild when the compiler is updated 2020-05-12 13:28:33 +09:00
MAINTAINERS MAINTAINERS: add git tree for random.c 2022-05-30 09:28:59 +02:00
Makefile Linux 5.15.48 2022-06-16 13:30:35 +02:00
README Drop all 00-INDEX files from Documentation/ 2018-09-09 15:08:58 -06:00

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.