floppy: fix div-by-zero in setup_format_params

This fixes a divide by zero error in the setup_format_params function of
the floppy driver.

Two consecutive ioctls can trigger the bug: The first one should set the
drive geometry with such .sect and .rate values for the F_SECT_PER_TRACK
to become zero.  Next, the floppy format operation should be called.

A floppy disk is not required to be inserted.  An unprivileged user
could trigger the bug if the device is accessible.

The patch checks F_SECT_PER_TRACK for a non-zero value in the
set_geometry function.  The proper check should involve a reasonable
upper limit for the .sect and .rate fields, but it could change the
UAPI.

The patch also checks F_SECT_PER_TRACK in the setup_format_params, and
cancels the formatting operation in case of zero.

The bug was found by syzkaller.

Signed-off-by: Denis Efremov <efremov@ispras.ru>
Tested-by: Willy Tarreau <w@1wt.eu>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/drivers/block/floppy.c b/drivers/block/floppy.c
index 9fb9b31..51246bc 100644 (file)
--- a/drivers/block/floppy.c
+++ b/drivers/block/floppy.c
@@ -2120,6 +2120,9 @@ static void setup_format_params(int track)
        raw_cmd->kernel_data = floppy_track_buffer;
        raw_cmd->length = 4 * F_SECT_PER_TRACK;
 
+       if (!F_SECT_PER_TRACK)
+               return;
+
        /* allow for about 30ms for data transport per track */
        head_shift = (F_SECT_PER_TRACK + 5) / 6;
 
@@ -3232,6 +3235,8 @@ static int set_geometry(unsigned int cmd, struct floppy_struct *g,
        /* sanity checking for parameters. */
        if (g->sect <= 0 ||
            g->head <= 0 ||
+           /* check for zero in F_SECT_PER_TRACK */
+           (unsigned char)((g->sect << 2) >> FD_SIZECODE(g)) == 0 ||
            g->track <= 0 || g->track > UDP->tracks >> STRETCH(g) ||
            /* check if reserved bits are set */
            (g->stretch & ~(FD_STRETCH | FD_SWAPSIDES | FD_SECTBASEMASK)) != 0)