floppy: fix calling platform_device_unregister() on invalid drives

[ Upstream commit 662167e59d2f3c15a44a88088fc6c1a67c8a3650 ]

platform_device_unregister() should only be called when
a respective platform_device_register() is called. However
the floppy driver currently allows failures when registring
a drive and a bail out could easily cause an invalid call
to platform_device_unregister() where it was not intended.

Fix this by adding a bool to keep track of when the platform
device was registered for a drive.

This does not fix any known panic / bug. This issue was found
through code inspection while preparing the driver to use the
up and coming support for device_add_disk() error handling.
From what I can tell from code inspection, chances of this
ever happening should be insanely small, perhaps OOM.

Signed-off-by: Luis Chamberlain <mcgrof@kernel.org>
Link: https://lore.kernel.org/r/20210927220302.1073499-5-mcgrof@kernel.org
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/drivers/block/floppy.c b/drivers/block/floppy.c
index fef79ea..fb2aafa 100644 (file)
--- a/drivers/block/floppy.c
+++ b/drivers/block/floppy.c
@@ -4478,6 +4478,7 @@ static const struct blk_mq_ops floppy_mq_ops = {
 };
 
 static struct platform_device floppy_device[N_DRIVE];
+static bool registered[N_DRIVE];
 
 static bool floppy_available(int drive)
 {
@@ -4693,6 +4694,8 @@ static int __init do_floppy_init(void)
                if (err)
                        goto out_remove_drives;
 
+               registered[drive] = true;
+
                device_add_disk(&floppy_device[drive].dev, disks[drive][0],
                                NULL);
        }
@@ -4703,7 +4706,8 @@ out_remove_drives:
        while (drive--) {
                if (floppy_available(drive)) {
                        del_gendisk(disks[drive][0]);
-                       platform_device_unregister(&floppy_device[drive]);
+                       if (registered[drive])
+                               platform_device_unregister(&floppy_device[drive]);
                }
        }
 out_release_dma:
@@ -4946,7 +4950,8 @@ static void __exit floppy_module_exit(void)
                                if (disks[drive][i])
                                        del_gendisk(disks[drive][i]);
                        }
-                       platform_device_unregister(&floppy_device[drive]);
+                       if (registered[drive])
+                               platform_device_unregister(&floppy_device[drive]);
                }
                for (i = 0; i < ARRAY_SIZE(floppy_type); i++) {
                        if (disks[drive][i])