lkml.org 
[lkml]   [2019]   [Jun]   [9]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
    Patch in this message
    /
    From
    Subject[PATCH 4.4 124/241] media: pvrusb2: Prevent a buffer overflow
    Date
    [ Upstream commit c1ced46c7b49ad7bc064e68d966e0ad303f917fb ]

    The ctrl_check_input() function is called from pvr2_ctrl_range_check().
    It's supposed to validate user supplied input and return true or false
    depending on whether the input is valid or not. The problem is that
    negative shifts or shifts greater than 31 are undefined in C. In
    practice with GCC they result in shift wrapping so this function returns
    true for some inputs which are not valid and this could result in a
    buffer overflow:

    drivers/media/usb/pvrusb2/pvrusb2-ctrl.c:205 pvr2_ctrl_get_valname()
    warn: uncapped user index 'names[val]'

    The cptr->hdw->input_allowed_mask mask is configured in pvr2_hdw_create()
    and the highest valid bit is BIT(4).

    Fixes: 7fb20fa38caa ("V4L/DVB (7299): pvrusb2: Improve logic which handles input choice availability")

    Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
    Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
    Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>
    Signed-off-by: Sasha Levin <sashal@kernel.org>
    ---
    drivers/media/usb/pvrusb2/pvrusb2-hdw.c | 2 ++
    drivers/media/usb/pvrusb2/pvrusb2-hdw.h | 1 +
    2 files changed, 3 insertions(+)

    diff --git a/drivers/media/usb/pvrusb2/pvrusb2-hdw.c b/drivers/media/usb/pvrusb2/pvrusb2-hdw.c
    index 0533ef20decfe..232b0fd3e4784 100644
    --- a/drivers/media/usb/pvrusb2/pvrusb2-hdw.c
    +++ b/drivers/media/usb/pvrusb2/pvrusb2-hdw.c
    @@ -670,6 +670,8 @@ static int ctrl_get_input(struct pvr2_ctrl *cptr,int *vp)

    static int ctrl_check_input(struct pvr2_ctrl *cptr,int v)
    {
    + if (v < 0 || v > PVR2_CVAL_INPUT_MAX)
    + return 0;
    return ((1 << v) & cptr->hdw->input_allowed_mask) != 0;
    }

    diff --git a/drivers/media/usb/pvrusb2/pvrusb2-hdw.h b/drivers/media/usb/pvrusb2/pvrusb2-hdw.h
    index a82a00dd73293..80869990ffbbb 100644
    --- a/drivers/media/usb/pvrusb2/pvrusb2-hdw.h
    +++ b/drivers/media/usb/pvrusb2/pvrusb2-hdw.h
    @@ -54,6 +54,7 @@
    #define PVR2_CVAL_INPUT_COMPOSITE 2
    #define PVR2_CVAL_INPUT_SVIDEO 3
    #define PVR2_CVAL_INPUT_RADIO 4
    +#define PVR2_CVAL_INPUT_MAX PVR2_CVAL_INPUT_RADIO

    enum pvr2_config {
    pvr2_config_empty, /* No configuration */
    --
    2.20.1


    \
     
     \ /
      Last update: 2019-06-09 19:12    [W:4.073 / U:0.248 seconds]
    ©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site