video: fbdev: i740fb: Check the argument of i740_calc_vclk()

[ Upstream commit 40bf722f8064f50200b8c4f8946cd625b441dda9 ]

Since the user can control the arguments of the ioctl() from the user
space, under special arguments that may result in a divide-by-zero bug.

If the user provides an improper 'pixclock' value that makes the argumet
of i740_calc_vclk() less than 'I740_RFREQ_FIX', it will cause a
divide-by-zero bug in:
    drivers/video/fbdev/i740fb.c:353 p_best = min(15, ilog2(I740_MAX_VCO_FREQ / (freq / I740_RFREQ_FIX)));

The following log can reveal it:

divide error: 0000 [#1] PREEMPT SMP KASAN PTI
RIP: 0010:i740_calc_vclk drivers/video/fbdev/i740fb.c:353 [inline]
RIP: 0010:i740fb_decode_var drivers/video/fbdev/i740fb.c:646 [inline]
RIP: 0010:i740fb_set_par+0x163f/0x3b70 drivers/video/fbdev/i740fb.c:742
Call Trace:
 fb_set_var+0x604/0xeb0 drivers/video/fbdev/core/fbmem.c:1034
 do_fb_ioctl+0x234/0x670 drivers/video/fbdev/core/fbmem.c:1110
 fb_ioctl+0xdd/0x130 drivers/video/fbdev/core/fbmem.c:1189

Fix this by checking the argument of i740_calc_vclk() first.

Signed-off-by: Zheyu Ma <zheyuma97@gmail.com>
Signed-off-by: Helge Deller <deller@gmx.de>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/drivers/video/fbdev/i740fb.c b/drivers/video/fbdev/i740fb.c
index 52cce0d..ad5ced4 100644 (file)
--- a/drivers/video/fbdev/i740fb.c
+++ b/drivers/video/fbdev/i740fb.c
@@ -400,7 +400,7 @@ static int i740fb_decode_var(const struct fb_var_screeninfo *var,
        u32 xres, right, hslen, left, xtotal;
        u32 yres, lower, vslen, upper, ytotal;
        u32 vxres, xoffset, vyres, yoffset;
-       u32 bpp, base, dacspeed24, mem;
+       u32 bpp, base, dacspeed24, mem, freq;
        u8 r7;
        int i;
 
@@ -643,7 +643,12 @@ static int i740fb_decode_var(const struct fb_var_screeninfo *var,
        par->atc[VGA_ATC_OVERSCAN] = 0;
 
        /* Calculate VCLK that most closely matches the requested dot clock */
-       i740_calc_vclk((((u32)1e9) / var->pixclock) * (u32)(1e3), par);
+       freq = (((u32)1e9) / var->pixclock) * (u32)(1e3);
+       if (freq < I740_RFREQ_FIX) {
+               fb_dbg(info, "invalid pixclock\n");
+               freq = I740_RFREQ_FIX;
+       }
+       i740_calc_vclk(freq, par);
 
        /* Since we program the clocks ourselves, always use VCLK2. */
        par->misc |= 0x0C;