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[83.162.234.235]) by smtp.gmail.com with ESMTPSA id d133sm8887008wmc.27.2020.04.29.07.03.45 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 29 Apr 2020 07:03:45 -0700 (PDT) From: Martijn Coenen To: axboe@kernel.dk, hch@lst.de, ming.lei@redhat.com Cc: narayan@google.com, zezeozue@google.com, kernel-team@android.com, maco@google.com, bvanassche@acm.org, Chaitanya.Kulkarni@wdc.com, jaegeuk@kernel.org, linux-block@vger.kernel.org, linux-kernel@vger.kernel.org, Martijn Coenen Subject: [PATCH v4 01/10] loop: Factor out loop size validation Date: Wed, 29 Apr 2020 16:03:32 +0200 Message-Id: <20200429140341.13294-2-maco@android.com> X-Mailer: git-send-email 2.26.2.303.gf8c07b1a785-goog In-Reply-To: <20200429140341.13294-1-maco@android.com> References: <20200429140341.13294-1-maco@android.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Sender: linux-block-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-block@vger.kernel.org Ensuring we don't truncate loff_t when casting to sector_t is done in multiple places; factor it out. Signed-off-by: Martijn Coenen --- drivers/block/loop.c | 25 ++++++++++++++++++++----- 1 file changed, 20 insertions(+), 5 deletions(-) diff --git a/drivers/block/loop.c b/drivers/block/loop.c index f1754262fc94..396b8bd4d75c 100644 --- a/drivers/block/loop.c +++ b/drivers/block/loop.c @@ -228,15 +228,30 @@ static void __loop_update_dio(struct loop_device *lo, bool dio) blk_mq_unfreeze_queue(lo->lo_queue); } +/** + * loop_validate_size() - validates that the passed in size fits in a sector_t + * @size: size to validate + */ +static int +loop_validate_size(loff_t size) +{ + if ((loff_t)(sector_t)size != size) + return -EFBIG; + + return 0; +} + static int figure_loop_size(struct loop_device *lo, loff_t offset, loff_t sizelimit) { + int err; loff_t size = get_size(offset, sizelimit, lo->lo_backing_file); - sector_t x = (sector_t)size; struct block_device *bdev = lo->lo_device; - if (unlikely((loff_t)x != size)) - return -EFBIG; + err = loop_validate_size(size); + if (err) + return err; + if (lo->lo_offset != offset) lo->lo_offset = offset; if (lo->lo_sizelimit != sizelimit) @@ -1003,9 +1018,9 @@ static int loop_set_fd(struct loop_device *lo, fmode_t mode, !file->f_op->write_iter) lo_flags |= LO_FLAGS_READ_ONLY; - error = -EFBIG; size = get_loop_size(lo, file); - if ((loff_t)(sector_t)size != size) + error = loop_validate_size(size); + if (error) goto out_unlock; error = loop_prepare_queue(lo); if (error) -- 2.26.2.303.gf8c07b1a785-goog