UBI: don't use array index before testing if it is negative

I can't find anything guaranteeing that 'ubi_num' cannot be <0 in
drivers/mtd/ubi/kapi.c::ubi_open_volume(), and in fact the code
even tests for that and errors out if so. Unfortunately the test
for "ubi_num < 0" happens after we've already used 'ubi_num' as
an array index - bad thing to do if it is negative.
This patch moves the test earlier in the function and then moves
the indexing using that variable after the check. A bit safer :-)

Signed-off-by: Jesper Juhl <jesper.juhl@gmail.com>
Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>

1 files changed, 7 insertions, 2 deletions

diff --git a/drivers/mtd/ubi/kapi.c b/drivers/mtd/ubi/kapi.c
index 4a458e83e4e9..03c774f41549 100644
--- a/drivers/mtd/ubi/kapi.c
+++ b/drivers/mtd/ubi/kapi.c
@@ -99,16 +99,21 @@ struct ubi_volume_desc *ubi_open_volume(int ubi_num, int vol_id, int mode)
 {
         int err;
         struct ubi_volume_desc *desc;
-        struct ubi_device *ubi = ubi_devices[ubi_num];
+        struct ubi_device *ubi;
         struct ubi_volume *vol;
 
         dbg_msg("open device %d volume %d, mode %d", ubi_num, vol_id, mode);
 
         err = -ENODEV;
+        if (ubi_num < 0)
+                return ERR_PTR(err);
+
+        ubi = ubi_devices[ubi_num];
+
         if (!try_module_get(THIS_MODULE))
                 return ERR_PTR(err);
 
-        if (ubi_num < 0 || ubi_num >= UBI_MAX_DEVICES || !ubi)
+        if (ubi_num >= UBI_MAX_DEVICES || !ubi)
                 goto out_put;
 
         err = -EINVAL;