ide-floppy: Fix unformatted media crash

A ZIP or similar with unformatted media will cause crashes when attempts
are made to read/write it in some cases. This is because bs_factor is
zero and we divide by it causing an oops.

As the size of a non-accessible/non-existant media is really a bit of a
zen question it doesn't matter if non-existant media is 512 bytes per
sector or zero. Setting it to 1 causes us to generate 512 bytes/sector
accesses and error properly.

Based on a fix found lurking in an ancient bugzilla entry since about 2004 (ugghhh)

Signed-off-by: Alan Cox <alan@redhat.com>
Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>

1 files changed, 2 insertions, 1 deletions

diff --git a/drivers/ide/ide-floppy.c b/drivers/ide/ide-floppy.c
index d33717c8afd4..07fa37d84df2 100644
--- a/drivers/ide/ide-floppy.c
+++ b/drivers/ide/ide-floppy.c
@@ -1433,7 +1433,8 @@ static int idefloppy_get_capacity (ide_drive_t *drive)
         
         drive->bios_cyl = 0;
         drive->bios_head = drive->bios_sect = 0;
-        floppy->blocks = floppy->bs_factor = 0;
+        floppy->blocks = 0;
+        floppy->bs_factor = 1;
         set_capacity(floppy->disk, 0);
 
         idefloppy_create_read_capacity_cmd(&pc);