lkml.org 
[lkml]   [2016]   [May]   [16]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
    Patch in this message
    /
    From
    Subject[PATCH 4.4 67/73] Input: max8997-haptic - fix NULL pointer dereference
    Date
    4.4-stable review patch.  If anyone has any objections, please let me know.

    ------------------

    From: Marek Szyprowski <m.szyprowski@samsung.com>

    commit 6ae645d5fa385f3787bf1723639cd907fe5865e7 upstream.

    NULL pointer derefence happens when booting with DTB because the
    platform data for haptic device is not set in supplied data from parent
    MFD device.

    The MFD device creates only platform data (from Device Tree) for itself,
    not for haptic child.

    Unable to handle kernel NULL pointer dereference at virtual address 0000009c
    pgd = c0004000
    [0000009c] *pgd=00000000
    Internal error: Oops: 5 [#1] PREEMPT SMP ARM
    (max8997_haptic_probe) from [<c03f9cec>] (platform_drv_probe+0x4c/0xb0)
    (platform_drv_probe) from [<c03f8440>] (driver_probe_device+0x214/0x2c0)
    (driver_probe_device) from [<c03f8598>] (__driver_attach+0xac/0xb0)
    (__driver_attach) from [<c03f67ac>] (bus_for_each_dev+0x68/0x9c)
    (bus_for_each_dev) from [<c03f7a38>] (bus_add_driver+0x1a0/0x218)
    (bus_add_driver) from [<c03f8db0>] (driver_register+0x78/0xf8)
    (driver_register) from [<c0101774>] (do_one_initcall+0x90/0x1d8)
    (do_one_initcall) from [<c0a00dbc>] (kernel_init_freeable+0x15c/0x1fc)
    (kernel_init_freeable) from [<c06bb5b4>] (kernel_init+0x8/0x114)
    (kernel_init) from [<c0107938>] (ret_from_fork+0x14/0x3c)

    Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>
    Fixes: 104594b01ce7 ("Input: add driver support for MAX8997-haptic")
    [k.kozlowski: Write commit message, add CC-stable]
    Signed-off-by: Krzysztof Kozlowski <k.kozlowski@samsung.com>
    Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
    Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

    ---
    drivers/input/misc/max8997_haptic.c | 6 ++++--
    1 file changed, 4 insertions(+), 2 deletions(-)

    --- a/drivers/input/misc/max8997_haptic.c
    +++ b/drivers/input/misc/max8997_haptic.c
    @@ -255,12 +255,14 @@ static int max8997_haptic_probe(struct p
    struct max8997_dev *iodev = dev_get_drvdata(pdev->dev.parent);
    const struct max8997_platform_data *pdata =
    dev_get_platdata(iodev->dev);
    - const struct max8997_haptic_platform_data *haptic_pdata =
    - pdata->haptic_pdata;
    + const struct max8997_haptic_platform_data *haptic_pdata = NULL;
    struct max8997_haptic *chip;
    struct input_dev *input_dev;
    int error;

    + if (pdata)
    + haptic_pdata = pdata->haptic_pdata;
    +
    if (!haptic_pdata) {
    dev_err(&pdev->dev, "no haptic platform data\n");
    return -EINVAL;

    \
     
     \ /
      Last update: 2016-05-17 03:41    [W:4.037 / U:0.032 seconds]
    ©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site