xfree86: Strip dangling pointers from desiredMode
Based on the original patch by Chris Wilson, which was a better fix than mine. We stash a copy of the desiredMode on the crtc so that we can restore it after a vt switch. This copy is a simple memcpy and so also stashes a references to the pointers contained within the desiredMode. Those pointers are freed the next time the outputs are probed and mode list rebuilt, resulting in us chasing those dangling pointers on the next mode switch. ==22787== Invalid read of size 1 ==22787== at 0x40293C2: __GI_strlen (in /usr/lib/valgrind/vgpreload_memcheck-amd64-linux.so) ==22787== by 0x668F875: strdup (strdup.c:42) ==22787== by 0x5DBA00: XNFstrdup (utils.c:1124) ==22787== by 0x4D72ED: xf86DuplicateMode (xf86Modes.c:209) ==22787== by 0x4CA848: xf86CrtcSetModeTransform (xf86Crtc.c:276) ==22787== by 0x4D05B4: xf86SetDesiredModes (xf86Crtc.c:2677) ==22787== by 0xA7479D0: sna_create_screen_resources (sna_driver.c:220) ==22787== by 0x4CB914: xf86CrtcCreateScreenResources (xf86Crtc.c:725) ==22787== by 0x425498: main (main.c:216) ==22787== Address 0x72c60e0 is 0 bytes inside a block of size 9 free'd ==22787== at 0x4027AAE: free (in /usr/lib/valgrind/vgpreload_memcheck-amd64-linux.so) ==22787== by 0x4A547E: xf86DeleteMode (xf86Mode.c:1984) ==22787== by 0x4CD84F: xf86ProbeOutputModes (xf86Crtc.c:1578) ==22787== by 0x4DC405: xf86RandR12GetInfo12 (xf86RandR12.c:1537) ==22787== by 0x518119: RRGetInfo (rrinfo.c:202) ==22787== by 0x51D997: rrGetScreenResources (rrscreen.c:335) ==22787== by 0x51E0D0: ProcRRGetScreenResources (rrscreen.c:475) ==22787== by 0x513852: ProcRRDispatch (randr.c:493) ==22787== by 0x4346DB: Dispatch (dispatch.c:439) ==22787== by 0x4256E4: main (main.c:287) Signed-off-by: Maarten Lankhorst <maarten.lankhorst@canonical.com> Reported-by: Zdenek Kabelac <zdenek.kabelac@gmail.com> Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=36108 Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk> Signed-off-by: Keith Packard <keithp@keithp.com>
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@ -422,6 +422,8 @@ extern _X_EXPORT void
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xf86SetModeCrtc(DisplayModePtr p, int adjustFlags);
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extern _X_EXPORT DisplayModePtr
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xf86DuplicateMode(const DisplayModeRec * pMode);
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extern _X_EXPORT void
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xf86SaveModeContents(DisplayModePtr intern, const DisplayModeRec * pMode);
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extern _X_EXPORT DisplayModePtr
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xf86DuplicateModes(ScrnInfoPtr pScrn, DisplayModePtr modeList);
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extern _X_EXPORT Bool
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@ -2453,7 +2453,7 @@ xf86InitialConfiguration(ScrnInfoPtr scrn, Bool canGrow)
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xf86CrtcPtr crtc = crtcs[o];
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if (mode && crtc) {
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crtc->desiredMode = *mode;
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xf86SaveModeContents(&crtc->desiredMode, mode);
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crtc->desiredRotation = output->initial_rotation;
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crtc->desiredX = output->initial_x;
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crtc->desiredY = output->initial_y;
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@ -2637,7 +2637,7 @@ xf86SetDesiredModes(ScrnInfoPtr scrn)
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if (!mode)
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return FALSE;
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crtc->desiredMode = *mode;
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xf86SaveModeContents(&crtc->desiredMode, mode);
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crtc->desiredRotation = RR_Rotate_0;
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crtc->desiredTransformPresent = FALSE;
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crtc->desiredX = 0;
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@ -2776,7 +2776,7 @@ xf86SetSingleMode(ScrnInfoPtr pScrn, DisplayModePtr desired, Rotation rotation)
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if (!xf86CrtcSetModeTransform(crtc, crtc_mode, rotation, NULL, 0, 0))
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ok = FALSE;
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else {
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crtc->desiredMode = *crtc_mode;
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xf86SaveModeContents(&crtc->desiredMode, crtc_mode);
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crtc->desiredRotation = rotation;
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crtc->desiredTransformPresent = FALSE;
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crtc->desiredX = 0;
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@ -190,6 +190,21 @@ xf86SetModeCrtc(DisplayModePtr p, int adjustFlags)
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p->CrtcVAdjusted = FALSE;
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}
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/**
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* Fills in a copy of mode, removing all stale pointer references.
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* xf86ModesEqual will return true when comparing with original mode.
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*/
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void
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xf86SaveModeContents(DisplayModePtr intern, const DisplayModeRec *mode)
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{
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*intern = *mode;
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intern->prev = intern->next = NULL;
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intern->name = NULL;
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intern->PrivSize = 0;
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intern->PrivFlags = 0;
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intern->Private = NULL;
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}
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/**
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* Allocates and returns a copy of pMode, including pointers within pMode.
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*/
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@ -1219,7 +1219,7 @@ xf86RandR12CrtcSet(ScreenPtr pScreen,
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/*
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* Save the last successful setting for EnterVT
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*/
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crtc->desiredMode = mode;
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xf86SaveModeContents(&crtc->desiredMode, &mode);
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crtc->desiredRotation = rotation;
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crtc->current_scanout = randr_crtc->scanout_pixmap;
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if (transform) {
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