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

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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>
This commit is contained in:
Zheyu Ma 2022-08-03 17:24:19 +08:00 committed by Helge Deller
parent 2f1c4523f7
commit 40bf722f80
1 changed files with 7 additions and 2 deletions
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9
drivers/video/fbdev/i740fb.c
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@ -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;