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Fri, 24 Jul 2026 14:45:56 -0700 (PDT) From: Fredric Cover To: sfrench@samba.org Cc: pc@manguebit.org, ronniesahlberg@gmail.com, sprasad@microsoft.com, tom@talpey.com, bharathsm@microsoft.com, linux-cifs@vger.kernel.org, linux-kernel@vger.kernel.org, Fredric Cover Subject: [PATCH v2 0/2] smb: client: fix dangling pointer in DFS target hints Date: Fri, 24 Jul 2026 14:44:33 -0700 Message-ID: <20260724214435.1850384-1-fredric.cover.lkernel@gmail.com> X-Mailer: git-send-email 2.53.0 In-Reply-To: <20260724023539.1596955-1-fredric.cover.lkernel@gmail.com> References: <20260724023539.1596955-1-fredric.cover.lkernel@gmail.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit This series addresses a Use-After-Free bug where ce->tgthint was left pointing to freed memory after free_tgts() was called. To fix this, Patch 1 hardens the DFS cache readers against ce->tgthint being NULL. Also, Patch 1 hardens callers of get_tgt_name(), which returns an error pointer when ce->tgthint is NULL. Patch 2 clears ce->tgthint in free_tgts(), eliminating the dangling pointer. v1 -> v2: - Addressed automated review by Sashiko: https://sashiko.dev/#/patchset/20260724023539.1596955-1-fredric.cover.lkernel%40gmail.com Split into a 2-patch series to harden readers against NULL and ERR_PTR target hints so that clearing ce->tgthint does not cause NULL pointer dereferences. Fredric Cover (2): smb: client: harden DFS cache against invalid target hints smb: client: clear ce->tgthint in free_tgts() fs/smb/client/dfs_cache.c | 33 ++++++++++++++++++++++++++------- 1 file changed, 26 insertions(+), 7 deletions(-) -- 2.53.0