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[03/48] mtd: mtd_blkdevs: dont increase open count on error path

Greg KH Jan 16, 2012 10:44 AM
Posted in group: LKML Archive
3.1-stable review patch.  If anyone has any objections, please let me know.


From: Brian Norris <>

commit 342ff28f5a2e5aa3236617bd2bddf6c749677ef2 upstream.

Some error paths in mtd_blkdevs were fixed in the following commit:

    commit 94735ec4044a6d318b83ad3c5794e931ed168d10
    mtd: mtd_blkdevs: fix error path in blktrans_open

But on these error paths, the block device's `dev->open' count is
already incremented before we check for errors. This meant that, while
the error path was handled correctly on the first time through
blktrans_open(), the device is erroneously considered already open on
the second time through.

This problem can be seen, for instance, when a UBI volume is
simultaneously mounted as a UBIFS partition and read through its
corresponding gluebi mtdblockX device. This results in blktrans_open()
passing its error checks (with `dev->open > 0') without actually having
a handle on the device. Here's a summarized log of the actions and
results with nandsim:

    # modprobe nandsim
    # modprobe mtdblock
    # modprobe gluebi
    # modprobe ubifs
    # ubiattach /dev/ubi_ctrl -m 0
    # ubimkvol /dev/ubi0 -N test -s 16MiB
    # mount -t ubifs ubi0:test /mnt
    # ls /dev/mtdblock*
    /dev/mtdblock0  /dev/mtdblock1
    # cat /dev/mtdblock1 > /dev/null
    cat: can't open '/dev/mtdblock4': Device or resource busy
    # cat /dev/mtdblock1 > /dev/null

    CPU 0 Unable to handle kernel paging request at virtual address
    fffffff0, epc == 8031536c, ra == 8031f280
    Call Trace:
    [<8031536c>] ubi_leb_read+0x14/0x164
    [<8031f280>] gluebi_read+0xf0/0x148
    [<802edba8>] mtdblock_readsect+0x64/0x198
    [<802ecfe4>] mtd_blktrans_thread+0x330/0x3f4
    [<8005be98>] kthread+0x88/0x90
    [<8000bc04>] kernel_thread_helper+0x10/0x18

Signed-off-by: Brian Norris <>
Signed-off-by: Artem Bityutskiy <>
Signed-off-by: David Woodhouse <>
Signed-off-by: Greg Kroah-Hartman <>

 drivers/mtd/mtd_blkdevs.c |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

--- a/drivers/mtd/mtd_blkdevs.c
+++ b/drivers/mtd/mtd_blkdevs.c
@@ -215,7 +215,7 @@ static int blktrans_open(struct block_de
-        if (dev->open++)
+        if (dev->open)
                 goto unlock;
@@ -235,6 +235,7 @@ static int blktrans_open(struct block_de
                 goto error_release;
+        dev->open++;
         return ret;

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