From: Sasha Levin <sashal@kernel.org>
To: linux-kernel@vger.kernel.org, stable@vger.kernel.org
Cc: Zheyu Ma <zheyuma97@gmail.com>, Helge Deller <deller@gmx.de>,
Sasha Levin <sashal@kernel.org>,
linux@zary.sk, linux-fbdev@vger.kernel.org,
dri-devel@lists.freedesktop.org
Subject: [PATCH AUTOSEL 4.9 7/8] video: fbdev: i740fb: Check the argument of i740_calc_vclk()
Date: Sun, 14 Aug 2022 12:30:40 -0400 [thread overview]
Message-ID: <20220814163041.2399552-7-sashal@kernel.org> (raw)
In-Reply-To: <20220814163041.2399552-1-sashal@kernel.org>
From: Zheyu Ma <zheyuma97@gmail.com>
[ 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>
---
drivers/video/fbdev/i740fb.c | 9 +++++++--
1 file changed, 7 insertions(+), 2 deletions(-)
diff --git a/drivers/video/fbdev/i740fb.c b/drivers/video/fbdev/i740fb.c
index 7bc5f6056c77..4147a9534179 100644
--- a/drivers/video/fbdev/i740fb.c
+++ b/drivers/video/fbdev/i740fb.c
@@ -399,7 +399,7 @@ 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;
@@ -641,7 +641,12 @@ 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;
--
2.35.1
next prev parent reply other threads:[~2022-08-14 16:43 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-08-14 16:30 [PATCH AUTOSEL 4.9 1/8] tty: serial: Fix refcount leak bug in ucc_uart.c Sasha Levin
2022-08-14 16:30 ` [PATCH AUTOSEL 4.9 2/8] vfio: Clear the caps->buf to NULL after free Sasha Levin
2022-08-14 16:30 ` [PATCH AUTOSEL 4.9 3/8] mips: cavium-octeon: Fix missing of_node_put() in octeon2_usb_clocks_start Sasha Levin
2022-08-14 16:30 ` [PATCH AUTOSEL 4.9 4/8] ALSA: core: Add async signal helpers Sasha Levin
2022-08-14 16:30 ` [PATCH AUTOSEL 4.9 5/8] ALSA: timer: Use deferred fasync helper Sasha Levin
2022-08-14 16:30 ` [PATCH AUTOSEL 4.9 6/8] powerpc/64: Init jump labels before parse_early_param() Sasha Levin
2022-08-14 16:30 ` Sasha Levin [this message]
2022-08-14 16:30 ` [PATCH AUTOSEL 4.9 8/8] MIPS: tlbex: Explicitly compare _PAGE_NO_EXEC against 0 Sasha Levin
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