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@xxxxxxxxxx>
---
drivers/block/floppy.c | 9 +++++++--
1 file changed, 7 insertions(+), 2 deletions(-)
diff --git a/drivers/block/floppy.c b/drivers/block/floppy.c
index 9538146e520e..3592a6277d0b 100644
--- 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 @@ static int __init do_floppy_init(void)
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])
--
2.30.2
