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Wed, 15 Jul 2026 04:52:36 -0700 (PDT) From: HyeongJun An To: Russell King Cc: Hyungjung Joo , linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, stable@vger.kernel.org, HyeongJun An Subject: [PATCH] fs/adfs: bound directory entry name length in adfs_fplus_getnext() Date: Wed, 15 Jul 2026 20:52:31 +0900 Message-ID: <20260715115231.1585166-1-sammiee5311@gmail.com> X-Mailer: git-send-email 2.43.0 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" adfs_fplus_getnext() reads the per-entry name length bigdirobnamelen straight from the on-disk big directory and passes it to adfs_dir_copyfrom() as the copy length into obj->name[], a fixed ADFS_MAX_NAME_LEN (260) byte buffer. adfs_dir_copyfrom() only bounds the copy against the number of directory buffers, not the size of the destination, so a crafted image with bigdirobnamelen larger than the buffer overflows the stack-allocated object_info::name that adfs_fplus_iterate() passes in. adfs_object_fixup() may additionally append a four byte ",xyz" filetype suffix, so the accepted length must also leave room for that. The old-style directory parser (dir_f.c) already clamps names to ADFS_F_NAME_LEN, and adfs_fplus_validate_header() validates the header name fields, but the per-entry name length in the big directory format was never checked. Reject over-long entries, using -EIO as elsewhere in this file for a corrupt big directory. Reported-by: Hyungjung Joo Closes: https://lore.kernel.org/all/CAP_j_b9BqyQrk3D5nj6RSa=3DeGcs2HkRYsWc3= WdXeXp9O3=3Dz4nQ@mail.gmail.com/ Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2") Cc: stable@vger.kernel.org Signed-off-by: HyeongJun An Assisted-by: Claude:claude-opus-4-8 --- fs/adfs/dir_fplus.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/fs/adfs/dir_fplus.c b/fs/adfs/dir_fplus.c index 4a15924014da..c68c301d8903 100644 --- a/fs/adfs/dir_fplus.c +++ b/fs/adfs/dir_fplus.c @@ -192,6 +192,8 @@ adfs_fplus_getnext(struct adfs_dir *dir, struct object_= info *obj) obj->indaddr =3D le32_to_cpu(bde.bigdirindaddr); obj->attr =3D le32_to_cpu(bde.bigdirattr); obj->name_len =3D le32_to_cpu(bde.bigdirobnamelen); + if (obj->name_len > ADFS_MAX_NAME_LEN - 4) /* leave room for ,xyz suffix = */ + return -EIO; =20 offset =3D adfs_fplus_offset(h, le32_to_cpu(h->bigdirentries)); offset +=3D le32_to_cpu(bde.bigdirobnameptr); --=20 2.43.0