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fbdev: nvidia: Fix potential divide by zero
variable var->pixclock can be set by user. In case it equals to zero, divide by zero would occur in nvidiafb_set_par. Similar crashes have happened in other fbdev drivers. There is no check and modification on var->pixclock along the call chain to nvidia_check_var and nvidiafb_set_par. We believe it could also be triggered in driver nvidia from user site. Signed-off-by: Wei Chen <harperchen1110@gmail.com> Signed-off-by: Helge Deller <deller@gmx.de>
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@ -764,6 +764,8 @@ static int nvidiafb_check_var(struct fb_var_screeninfo *var,
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int pitch, err = 0;
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NVTRACE_ENTER();
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if (!var->pixclock)
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return -EINVAL;
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var->transp.offset = 0;
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var->transp.length = 0;
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