Attachment 80090 Details for Bug 65210 – return NULL for xf86CompatOutput if config->compat_output < 0

return NULL for xf86CompatOutput if config->compat_output < 0

0000-xf86CompatOutput.patch (text/plain), 1.91 KB, created by vdb128 on 2013-05-31 12:45:21 UTC

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Creator: vdb128

Created: 2013-05-31 12:45:21 UTC

Size: 1.91 KB

patch

obsolete

>xserver/hw/xfree86/modes compat_output == -1 bad dereference
>
>http://lists.x.org/archives/xorg-devel/2013-March/035751.html
>http://lists.x.org/archives/xorg-devel/2013-April/035933.html
>
>[PATCH] xf86: return NULL for xf86CompatOutput if config->compat_output is -1
>
>If there is no compat output, config->compat_output is -1 and xf86CompatOutput
>reads before the beginning of the outputs array.
>
> Invalid read of size 8
>    at 0x4DB892: xf86CompatOutput (xf86Crtc.h:734)
>    by 0x4E285D: xf86OutputSetEDID (xf86Crtc.c:2986)
>    by 0x862200F: intel_output_attach_edid (intel_display.c:895)
>    by 0x86222A5: intel_output_get_modes (intel_display.c:955)
>    by 0x4DF296: xf86ProbeOutputModes (xf86Crtc.c:1586)
>    by 0x4E1349: xf86InitialConfiguration (xf86Crtc.c:2380)
>    by 0x8623F72: intel_mode_pre_init (intel_display.c:1788)
>    by 0x8626088: I830PreInit (intel_driver.c:625)
>    by 0x49873B: InitOutput (xf86Init.c:606)
>    by 0x4257B8: main (main.c:204)
>  Address 0x7955d88 is 8 bytes before a block of size 16 alloc'd
>    at 0x4C2C25E: realloc (in /usr/lib/valgrind/vgpreload_memcheck-amd64-linux.so)
>    by 0x4DCD54: xf86OutputCreate (xf86Crtc.c:621)
>    by 0x862322F: intel_output_init (intel_display.c:1416)
>    by 0x8623F22: intel_mode_pre_init (intel_display.c:1780)
>    by 0x8626088: I830PreInit (intel_driver.c:625)
>    by 0x49873B: InitOutput (xf86Init.c:606)
>    by 0x4257B8: main (main.c:204)
>
>Signed-off-by: Aaron Plattner <aplattner@nvidia.com>
>---
> hw/xfree86/modes/xf86Crtc.h | 2 ++
> 1 file changed, 2 insertions(+)
>
>diff --git a/hw/xfree86/modes/xf86Crtc.h b/hw/xfree86/modes/xf86Crtc.h
>index 802303f..1ac8485 100644
>--- a/hw/xfree86/modes/xf86Crtc.h
>+++ b/hw/xfree86/modes/xf86Crtc.h
>@@ -731,6 +731,8 @@ xf86CompatOutput(ScrnInfoPtr pScrn)
> {
>     xf86CrtcConfigPtr config = XF86_CRTC_CONFIG_PTR(pScrn);
> 
>+    if (config->compat_output < 0)
>+        return NULL;
>     return config->output[config->compat_output];
> }
> 
>-- 
>1.8.2

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