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Cengiz Can 6d1444dbf9 blktrace: fix dereference after null check commit `153031a301` upstream. There was a recent change in blktrace.c that added a RCU protection to `q->blk_trace` in order to fix a use-after-free issue during access. However the change missed an edge case that can lead to dereferencing of `bt` pointer even when it's NULL: Coverity static analyzer marked this as a FORWARD_NULL issue with CID 1460458. ``` /kernel/trace/blktrace.c: 1904 in sysfs_blk_trace_attr_store() 1898 ret = 0; 1899 if (bt == NULL) 1900 ret = blk_trace_setup_queue(q, bdev); 1901 1902 if (ret == 0) { 1903 if (attr == &dev_attr_act_mask) >>> CID 1460458: Null pointer dereferences (FORWARD_NULL) >>> Dereferencing null pointer "bt". 1904 bt->act_mask = value; 1905 else if (attr == &dev_attr_pid) 1906 bt->pid = value; 1907 else if (attr == &dev_attr_start_lba) 1908 bt->start_lba = value; 1909 else if (attr == &dev_attr_end_lba) ``` Added a reassignment with RCU annotation to fix the issue. Fixes: `c780e86dd4` ("blktrace: Protect q->blk_trace with RCU") Reviewed-by: Ming Lei <ming.lei@redhat.com> Reviewed-by: Bob Liu <bob.liu@oracle.com> Reviewed-by: Steven Rostedt (VMware) <rostedt@goodmis.org> Signed-off-by: Cengiz Can <cengiz@kernel.wtf> Signed-off-by: Jens Axboe <axboe@kernel.dk> Signed-off-by: Ben Hutchings <ben.hutchings@codethink.co.uk> Signed-off-by: Sasha Levin <sashal@kernel.org>		2020-04-29 16:31:17 +02:00
arch	Revert "powerpc/64: irq_work avoid interrupt when called with hardware irqs enabled"	2020-04-29 16:31:14 +02:00
block	block, bfq: fix use-after-free in bfq_idle_slice_timer_body	2020-04-17 10:48:42 +02:00
certs
crypto
Documentation	arm64: errata: Hide CTR_EL0.DIC on systems affected by Neoverse-N1 #1542419	2020-04-29 16:31:08 +02:00
drivers	net: ipv6_stub: use ip6_dst_lookup_flow instead of ip6_dst_lookup	2020-04-29 16:31:17 +02:00
firmware
fs	ceph: don't skip updating wanted caps when cap is stale	2020-04-29 16:31:11 +02:00
include	blktrace: Protect q->blk_trace with RCU	2020-04-29 16:31:17 +02:00
init
ipc	ipc/util.c: sysvipc_find_ipc() should increase position index	2020-04-29 16:31:13 +02:00
kernel	blktrace: fix dereference after null check	2020-04-29 16:31:17 +02:00
lib	lib/raid6: use vdupq_n_u8 to avoid endianness warnings	2020-04-23 10:30:15 +02:00
LICENSES
mm	mm/vmalloc.c: move 'area->pages' after if statement	2020-04-21 09:03:13 +02:00
net	net: ipv6_stub: use ip6_dst_lookup_flow instead of ip6_dst_lookup	2020-04-29 16:31:17 +02:00
samples
scripts	kconfig: qconf: Fix a few alignment issues	2020-04-29 16:31:13 +02:00
security	KEYS: Don't write out to userspace while holding key semaphore	2020-04-23 10:30:24 +02:00
sound	ASoC: Intel: bytcr_rt5640: Add quirk for MPMAN MPWIN895CL tablet	2020-04-29 16:31:15 +02:00
tools	tracing/selftests: Turn off timeout setting	2020-04-29 16:31:15 +02:00
usr	initramfs: restore default compression behavior	2020-04-13 10:44:59 +02:00
virt
.clang-format
.cocciconfig
.get_maintainer.ignore
.gitattributes
.gitignore
.mailmap
COPYING
CREDITS
Kbuild
Kconfig
MAINTAINERS
Makefile	Linux 4.19.118	2020-04-23 10:30:24 +02:00
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.
See Documentation/00-INDEX for a list of what is contained in each file.

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.