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Thu, 29 Oct 2026 09:46:37 +0000 From: Qu Wenruo To: linux-btrfs@vger.kernel.org Subject: [PATCH 0/5] btrfs-progs: btrfs path leak fix, part 1 Date: Thu, 29 Oct 2026 20:16:10 +1030 Message-ID: X-Mailer: git-send-email 2.56.0 X-Mailing-List: linux-btrfs@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Spamd-Result: default: False [-12.01 / 50.00]; SUSE_INTERNAL_BYPASS(-9.00)[]; BAYES_HAM(-3.00)[100.00%]; MID_CONTAINS_FROM(1.00)[]; NEURAL_HAM_LONG(-1.00)[-1.000]; R_MISSING_CHARSET(0.50)[]; R_DKIM_ALLOW(-0.20)[suse.com:s=susede1]; NEURAL_HAM_SHORT(-0.20)[-1.000]; MIME_GOOD(-0.10)[text/plain]; MX_GOOD(-0.01)[]; FROM_HAS_DN(0.00)[]; TO_MATCH_ENVRCPT_ALL(0.00)[]; DKIM_SIGNED(0.00)[suse.com:s=susede1]; ARC_NA(0.00)[]; RBL_SPAMHAUS_BLOCKED_OPENRESOLVER(0.00)[2a07:de40:b281:104:10:150:64:97:from]; RCPT_COUNT_ONE(0.00)[1]; PREVIOUSLY_DELIVERED(0.00)[linux-btrfs@vger.kernel.org]; FROM_EQ_ENVFROM(0.00)[]; RCVD_TLS_ALL(0.00)[]; RECEIVED_SPAMHAUS_BLOCKED_OPENRESOLVER(0.00)[2a07:de40:b281:106:10:150:64:167:received]; DWL_DNSWL_BLOCKED(0.00)[suse.com:dkim]; RCVD_COUNT_TWO(0.00)[2]; TO_DN_NONE(0.00)[]; MIME_TRACE(0.00)[0:+]; RCVD_VIA_SMTP_AUTH(0.00)[]; DKIM_TRACE(0.00)[suse.com:+]; DBL_BLOCKED_OPENRESOLVER(0.00)[imap1.dmz-prg2.suse.org:rdns,imap1.dmz-prg2.suse.org:helo,suse.com:dkim] X-Rspamd-Server: rspamd1.dmz-prg2.suse.org X-Rspamd-Action: no action X-Spam-Flag: NO X-Spam-Score: -12.01 X-Spam-Level: X-Rspamd-Queue-Id: 1F19F21F6D To avoid future LLM script kiddos, we need to fix path leaks. This is part 1, focusing on leaks on btrfs_alloc_path(). The most important part is the second patch, which introduces BTRFS_PATH_AUTO_(FREE|RELEASE), so that we can finally get the same capability. Unfortunately this will require the compiler support for the __cleanup__ attribute. If not supported, configure will reject the build. Then several fixes using BTRFS_PATH_AUTO_FREE(). The last one has several other small fixes batched together, as they are all inside the same btrfs-corrupt-block. Part 2 will focus on the on-stack paths, which can still leak the ebs, and are the most common sites in btrfs-progs. Qu Wenruo (5): btrfs-progs: introduce compiler_attributes.h btrfs-progs: utilize __cleanup__ attribute for btrfs_path btrfs-progs: sync btrfs_translate_remap() to fix a path leak btrfs-progs: fix a path leak in alloc_reserved_tree_block() btrfs-progs: fix several memory bugs in btrfs-corrupt-block btrfs-corrupt-block.c | 34 ++++++++----- configure.ac | 15 ++++++ include/compiler_attributes.h | 39 +++++++++++++++ include/kerncompat.h | 7 +-- kernel-lib/overflow.h | 8 +--- kernel-shared/cleanup.h | 89 +++++++++++++++++++++++++++++++++++ kernel-shared/ctree.h | 10 ++++ kernel-shared/extent-tree.c | 4 +- kernel-shared/volumes.c | 55 +++++----------------- 9 files changed, 193 insertions(+), 68 deletions(-) create mode 100644 include/compiler_attributes.h create mode 100644 kernel-shared/cleanup.h -- 2.56.0