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| author | Wei Chen <harperchen1110@gmail.com> | 2023-03-15 08:33:47 +0000 |
|---|---|---|
| committer | Helge Deller <deller@gmx.de> | 2023-03-16 16:18:16 +0100 |
| commit | d823685486a3446d061fed7c7d2f80af984f119a (patch) | |
| tree | 8cb44ddb2b1532c2a9c40d4b32929a83b383a26e /drivers/video | |
| parent | 92e2a00f2987483e1f9253625828622edd442e61 (diff) | |
| download | linux-stable-d823685486a3446d061fed7c7d2f80af984f119a.tar.gz linux-stable-d823685486a3446d061fed7c7d2f80af984f119a.tar.bz2 linux-stable-d823685486a3446d061fed7c7d2f80af984f119a.zip | |
fbdev: intelfb: Fix potential divide by zero
Variable var->pixclock is controlled by user and can be assigned
to zero. Without proper check, divide by zero would occur in
intelfbhw_validate_mode and intelfbhw_mode_to_hw.
Error out if var->pixclock is zero.
Signed-off-by: Wei Chen <harperchen1110@gmail.com>
Signed-off-by: Helge Deller <deller@gmx.de>
Diffstat (limited to 'drivers/video')
| -rw-r--r-- | drivers/video/fbdev/intelfb/intelfbdrv.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/drivers/video/fbdev/intelfb/intelfbdrv.c b/drivers/video/fbdev/intelfb/intelfbdrv.c index 0a9e5067b201..a81095b2b1ea 100644 --- a/drivers/video/fbdev/intelfb/intelfbdrv.c +++ b/drivers/video/fbdev/intelfb/intelfbdrv.c @@ -1222,6 +1222,9 @@ static int intelfb_check_var(struct fb_var_screeninfo *var, dinfo = GET_DINFO(info); + if (!var->pixclock) + return -EINVAL; + /* update the pitch */ if (intelfbhw_validate_mode(dinfo, var) != 0) return -EINVAL; |