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Filipe Manana de3ea5be51 btrfs: fix extent buffer leak on failure to copy root 
commit 72c9925f87c8b74f36f8e75a4cd93d964538d3ca upstream.

At btrfs_copy_root(), if the call to btrfs_inc_ref() fails we end up
returning without unlocking and releasing our reference on the extent
buffer named "cow" we previously allocated with btrfs_alloc_tree_block().

So fix that by unlocking the extent buffer and dropping our reference on
it before returning.

Fixes: be20aa9dba ("Btrfs: Add mount option to turn off data cow")
CC: stable@vger.kernel.org # 4.4+
Signed-off-by: Filipe Manana <fdmanana@suse.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2021-03-04 11:38:30 +01:00
arch Revert "MIPS: Octeon: Remove special handling of CONFIG_MIPS_ELF_APPENDED_DTB=y" 2021-03-04 11:38:26 +01:00
block blk-settings: align max_sectors on "logical_block_size" boundary 2021-03-04 11:38:22 +01:00
certs certs: Fix blacklist flag type confusion 2021-03-04 11:37:59 +01:00
crypto crypto: ecdh_helper - Ensure 'len >= secret.len' in decode_key() 2021-03-04 11:37:49 +01:00
Documentation watch_queue: Drop references to /dev/watch_queue 2021-03-04 11:37:59 +01:00
drivers KEYS: trusted: Reserve TPM for seal and unseal operations 2021-03-04 11:38:29 +01:00
fs btrfs: fix extent buffer leak on failure to copy root 2021-03-04 11:38:30 +01:00
include KEYS: trusted: Reserve TPM for seal and unseal operations 2021-03-04 11:38:29 +01:00
init fgraph: Initialize tracing_graph_pause at task creation 2021-02-10 09:29:16 +01:00
ipc
kernel printk: avoid prb_first_valid_seq() where possible 2021-03-04 11:38:07 +01:00
lib udp: fix skb_copy_and_csum_datagram with odd segment sizes 2021-02-17 11:02:28 +01:00
LICENSES
mm mm: fix memory_failure() handling of dax-namespace metadata 2021-03-04 11:38:21 +01:00
net svcrdma: Hold private mutex while invoking rdma_accept() 2021-03-04 11:38:08 +01:00
samples watch_queue: Drop references to /dev/watch_queue 2021-03-04 11:37:59 +01:00
scripts scripts/recordmcount.pl: support big endian for ARCH sh 2021-02-26 10:13:02 +01:00
security KEYS: trusted: Reserve TPM for seal and unseal operations 2021-03-04 11:38:29 +01:00
sound ASoC: siu: Fix build error by a wrong const prefix 2021-03-04 11:38:28 +01:00
tools perf test: Fix unaligned access in sample parsing test 2021-03-04 11:38:10 +01:00
usr
virt KVM: Use kvm_pfn_t for local PFN variable in hva_to_pfn_remapped() 2021-02-26 10:13:01 +01:00
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Makefile Linux 5.10.19 2021-02-26 10:14:35 +01:00
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.