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    Subject[PATCH 5.18 034/112] fbmem: Check virtual screen sizes in fb_set_var()
    Date
    From: Helge Deller <deller@gmx.de>

    commit 6c11df58fd1ac0aefcb3b227f72769272b939e56 upstream.

    Verify that the fbdev or drm driver correctly adjusted the virtual
    screen sizes. On failure report the failing driver and reject the screen
    size change.

    Signed-off-by: Helge Deller <deller@gmx.de>
    Reviewed-by: Geert Uytterhoeven <geert@linux-m68k.org>
    Cc: stable@vger.kernel.org # v5.4+
    Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
    ---
    drivers/video/fbdev/core/fbmem.c | 10 ++++++++++
    1 file changed, 10 insertions(+)

    --- a/drivers/video/fbdev/core/fbmem.c
    +++ b/drivers/video/fbdev/core/fbmem.c
    @@ -1016,6 +1016,16 @@ fb_set_var(struct fb_info *info, struct
    if (ret)
    return ret;

    + /* verify that virtual resolution >= physical resolution */
    + if (var->xres_virtual < var->xres ||
    + var->yres_virtual < var->yres) {
    + pr_warn("WARNING: fbcon: Driver '%s' missed to adjust virtual screen size (%ux%u vs. %ux%u)\n",
    + info->fix.id,
    + var->xres_virtual, var->yres_virtual,
    + var->xres, var->yres);
    + return -EINVAL;
    + }
    +
    if ((var->activate & FB_ACTIVATE_MASK) != FB_ACTIVATE_NOW)
    return 0;


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