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[34.82.187.25]) by smtp.gmail.com with ESMTPSA id 41be03b00d2f7-cc7da126a49sm453319a12.7.2026.09.30.01.19.51 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 30 Sep 2026 01:19:51 -0700 (PDT) From: Hui Peng To: Anders Larsen , Matthias Goergens Cc: linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, stable@vger.kernel.org, Hui Peng Subject: [PATCH v5 3/6] qnx6: release bh on error path in qnx6_fill_super() Date: Wed, 30 Sep 2026 08:19:44 +0000 Message-ID: <20260930081947.511613-4-benquike@gmail.com> X-Mailer: git-send-email 2.56.0.rc1.315.gc6ed9934b7-goog In-Reply-To: <20260930081947.511613-1-benquike@gmail.com> References: <20260930081947.511613-1-benquike@gmail.com> Precedence: bulk X-Mailing-List: stable@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit In qnx6_fill_super(), when indirect block tree level validation fails at mmi_success, the code jumps to label out: before sbi is assigned. Reading sbi->sb_buf at label out: reads an uninitialized stack pointer sbi, causing a general protection fault under CONFIG_INIT_STACK_ALL_PATTERN and leaking qs->sb_buf. Use qs->sb_buf instead of sbi->sb_buf at label out: to safely release qs->sb_buf when mounting mmi_fs images. Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2") Cc: stable@vger.kernel.org Assisted-by: LLM Signed-off-by: Hui Peng --- Changes in v5: - Use qs->sb_buf instead of sbi->sb_buf at label out: to prevent reading uninitialized sbi when mounting mmi_fs images, as pointed out by Matthias Goergens. fs/qnx6/inode.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/fs/qnx6/inode.c b/fs/qnx6/inode.c index 3c880854c867..0a68d0eb4b71 100644 --- a/fs/qnx6/inode.c +++ b/fs/qnx6/inode.c @@ -465,6 +465,10 @@ static int qnx6_fill_super(struct super_block *s, struct fs_context *fc) out1: iput(sbi->inodes); out: + if (qs->sb_buf && !bh1 && !bh2) { + brelse(qs->sb_buf); + qs->sb_buf = NULL; + } brelse(bh1); brelse(bh2); outnobh: -- 2.47.3