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([221.156.231.192]) by smtp.gmail.com with ESMTPSA id d2e1a72fcca58-839659487afsm13380429b3a.18.2026.05.08.23.12.50 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 08 May 2026 23:12:51 -0700 (PDT) From: DaeMyung Kang To: Namjae Jeon , Hyunchul Lee Cc: linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, DaeMyung Kang Subject: [PATCH v2 2/3] ntfs: fix MFT bitmap scan 2^32 boundary check Date: Sat, 9 May 2026 15:12:36 +0900 Message-ID: <20260509061237.3233714-3-charsyam@gmail.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20260508153410.2624801-1-charsyam@gmail.com> References: <20260508153410.2624801-1-charsyam@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 NTFS MFT record numbers are limited to the 32-bit range, and ntfs_mft_record_layout() rejects mft_no >= 2^32. The free-MFT-record bitmap scan in ntfs_mft_bitmap_find_and_alloc_free_rec_nolock() also guards against this overflow but uses a strict greater than comparison, allowing record number 2^32 itself through this earlier check. Every other 2^32 boundary check in fs/ntfs/mft.c uses '>=', so the strict greater than here is both a real off-by-one and an internal inconsistency. A model with ll == 2^32 confirms the current check accepts the value while the corrected check rejects it. Use '>=' so the boundary matches the layout-time rejection and the surrounding bitmap-scan checks. Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2") Signed-off-by: DaeMyung Kang --- fs/ntfs/mft.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/fs/ntfs/mft.c b/fs/ntfs/mft.c index 827b99f4597a..b056c9bbdf5f 100644 --- a/fs/ntfs/mft.c +++ b/fs/ntfs/mft.c @@ -1045,7 +1045,7 @@ static s64 ntfs_mft_bitmap_find_and_alloc_free_rec_nolock(struct ntfs_volume *vo b = ffz((unsigned long)*byte); if (b < 8 && b >= (bit & 7)) { ll = data_pos + (bit & ~7ull) + b; - if (unlikely(ll > (1ll << 32))) { + if (unlikely(ll >= (1ll << 32))) { folio_unlock(folio); kunmap_local(buf); folio_put(folio); -- 2.43.0