Crash [@ nsInlineFrame::ReflowFrames] with ::first-letter float, binding, pre and //

VERIFIED FIXED

Status

()

Core
Layout
P3
critical
VERIFIED FIXED
10 years ago
2 years ago

People

(Reporter: Martijn Wargers (dead), Assigned: Mats Palmgren (vacation - back in August))

Tracking

(5 keywords)

unspecified
x86
All
crash, fixed1.8.1.21, testcase, verified1.9.0.6, verified1.9.1
Points:
---
Bug Flags:
blocking1.9.1 +
blocking1.9 -
blocking1.9.0.6 +
wanted1.9.0.x +
blocking1.8.1.next +
wanted1.8.1.x +
blocking1.8.0.next +
wanted1.8.0.x +
in-testsuite +

Firefox Tracking Flags

(Not tracked)

Details

(Whiteboard: [sg:critical?] using freed frame, crash signature)

Attachments

(5 attachments, 2 obsolete attachments)

(Reporter)

Description

10 years ago
Created attachment 286096 [details]
testcase

See testcase which crashes current trunk and branch builds on load.
Since this also crashes on branch, I'm marking it security sensitive for now.

http://crash-stats.mozilla.com/report/index/4bf28766-828f-11dc-af09-001a4bd43ed6
0  	nsInlineFrame::ReflowFrames(nsPresContext*, nsHTMLReflowState const&, nsInlineFrame::InlineReflowState&, nsHTMLReflowMetrics&, unsigned int&)  	 mozilla/layout/generic/nsInlineFrame.cpp:460
1 	nsInlineFrame::Reflow(nsPresContext*, nsHTMLReflowMetrics&, nsHTMLReflowState const&, unsigned int&) 	mozilla/layout/generic/nsInlineFrame.cpp:394
2 	nsLineLayout::ReflowFrame(nsIFrame*, unsigned int&, nsHTMLReflowMetrics*, int&) 	mozilla/layout/generic/nsLineLayout.cpp:883
3 	nsBlockFrame::ReflowInlineFrame(nsBlockReflowState&, nsLineLayout&, nsLineList_iterator, nsIFrame*, LineReflowStatus*) 	mozilla/layout/generic/nsBlockFrame.cpp:3573
4 	nsBlockFrame::DoReflowInlineFrames(nsBlockReflowState&, nsLineLayout&, nsLineList_iterator, int*, LineReflowStatus*, int) 	mozilla/layout/generic/nsBlockFrame.cpp:3393
5 	nsBlockFrame::ReflowInlineFrames(nsBlockReflowState&, nsLineList_iterator, int*) 	mozilla/layout/generic/nsBlockFrame.cpp:3237
6 	nsBlockFrame::ReflowLine(nsBlockReflowState&, nsLineList_iterator, int*) 	mozilla/layout/generic/nsBlockFrame.cpp:2269
7 	nsBlockFrame::ReflowDirtyLines(nsBlockReflowState&) 	mozilla/layout/generic/nsBlockFrame.cpp:1854
8 	nsBlockFrame::Reflow(nsPresContext*, nsHTMLReflowMetrics&, nsHTMLReflowState const&, unsigned int&) 	mozilla/layout/generic/nsBlockFrame.cpp:940
9 	nsBlockReflowContext::ReflowBlock(nsRect const&, int, nsCollapsingMargin&, int, int, nsMargin&, nsLineBox*, nsHTMLReflowState&, unsigned int&, nsBlockReflowState&) 	mozilla/layout/generic/nsBlockReflowContext.cpp:339
10 	nsBlockFrame::ReflowBlockFrame(nsBlockReflowState&, nsLineList_iterator, int*) 	mozilla/layout/generic/nsBlockFrame.cpp:2973
etc..
Flags: blocking1.9?
I get "StealFrame failure!"
Flags: wanted1.9+
Flags: blocking1.9?
Flags: blocking1.9-

Comment 2

10 years ago
I get  "ASSERTION: bad parent frame pointer: 'kid->GetParent() == (nsIFrame*)this', file /home/fantasai/moz/mozilla/layout/generic/nsContainerFrame.cpp, line 1497" when I try to print a frametree right before StealFrame. So I don't think the failure is StealFrame's fault: somebody's screwed up the frame tree.
Also crashes Firefox 2.0.0.11 on Linux
Flags: in-testsuite?
OS: Windows XP → All
Whiteboard: [sg:critical?] using freed frame
Version: Trunk → unspecified
Created attachment 291133 [details]
Frame dump

We are reflowing a frame tree that looks like this.
Note that the parent pointers for the float child next-in-flows
haven't been setup yet due the "lazy parent pointer" optimization.

What happens is this (roughly):
reflow the second line (0x1467b18)
  which reflows the placeholder
  and then reflows the float, which decides it's complete and calls
    DeleteNextInFlowChild() on the kid's next-in-flow (0x1459bb0).

But DeleteNextInFlowChild() requires correct parent pointers!
Created attachment 291135 [details] [diff] [review]
WIP

This fixes the crash, but also kills this optimization I guess.
Is there a way to avoid that, at least in most cases?
(I'll dig some more tomorrow)
Assignee: nobody → mats.palmgren
Status: NEW → ASSIGNED
Killing that optimization would be very unfortunate...
Why wouldn't an sg:critical bug block the release? If it's not actually a security bug please let us know, otherwise please block on this one.
Flags: blocking1.9- → blocking1.9?
Priority: -- → P2

Comment 8

10 years ago
Roc - why did you minus this?
Because I minused it in October and Mats identified it as sg:critical? in December. It should block now.

Updated

10 years ago
Flags: blocking1.9? → blocking1.9+
Flags: wanted1.9.0.x+
Flags: wanted1.9+
Flags: blocking1.9-

Updated

10 years ago
Flags: tracking1.9+
Do we need to make this blocking or not?  The comments seem to suggest this should block.

Comment 11

9 years ago
Still crashes [@ nsInlineFrame::ReflowFrames] on trunk.

Mats, are you still working on this?
Flags: blocking1.9.1?
Flags: blocking1.9.1? → blocking1.9.1+
Priority: P2 → P3
I am adding this to our "Top Security Bugs" list.  Please treat this as a top priority.
Created attachment 347427 [details] [diff] [review]
crashtest.diff
Created attachment 347433 [details] [diff] [review]
Patch rev. 2

The crash only occurs when we delete a next-in-flow that is a child of
a ns(Positioned)InlineFrame in reflow with "lazilySetParentPointer" set.
I think such next-in-flow frames can only occur for ::first-letter
(or possibly ::first-line ?) child frames.  I don't think ::first-line
is a problem since it seems to do all re-parenting up front and it
leaves InlineReflowState::mSetParentPointer false:
http://mxr.mozilla.org/mozilla-central/source/layout/generic/nsInlineFrame.cpp?mark=876-890#865

At one point I also did ReparentFloatsForInlineChild() for the
next-in-flow but it seems overkill since they are always text frames
(we may want to revisit this in the future when we allow first-letter
to dig into child blocks -- which I think would lead to nested
first-letter frames).
Attachment #291135 - Attachment is obsolete: true
Attachment #347433 - Flags: superreview?(roc)
Attachment #347433 - Flags: review?(roc)
This looks good but I think it would be best to move this "fix lazy parent pointer" code out to nsLayoutUtils and give it a real spec and documentation.
Created attachment 347804 [details] [diff] [review]
Patch rev. 3

This is a different approach;  fix the parent for letter frame child
next-in-flows before reflowing the letter frame.  I think I prefer this
patch - it brings a little bit of first-letter knowledge into nsInlineFrame
rather than bringing nsInlineFrame internals into nsFirstLetterFrame.
(and it would be easier to add ReparentFloatsForInlineChild here too
if we need it in the future)

What do you think?
Attachment #347433 - Attachment is obsolete: true
Attachment #347804 - Flags: superreview?(roc)
Attachment #347804 - Flags: review?(roc)
Attachment #347433 - Flags: superreview?(roc)
Attachment #347433 - Flags: review?(roc)
Comment on attachment 347804 [details] [diff] [review]
Patch rev. 3

I like it. Probably should add an assertion that 'child' and its next-in-flows are text frames.
Attachment #347804 - Flags: superreview?(roc)
Attachment #347804 - Flags: superreview+
Attachment #347804 - Flags: review?(roc)
Attachment #347804 - Flags: review+
Whiteboard: [sg:critical?] using freed frame → [sg:critical?] using freed frame [needs addressing review comments and landing]
This has a reviewed patch, though I'm not sure roc's review comment was addressed.  Can we get this landed please, as it is one of our "Top Security Bugs"?
Added the suggested assertions:
http://hg.mozilla.org/mozilla-central/rev/18ae5e6af525

I'm holding the crashtest until Firefox 3.0.x is fixed.

-> FIXED
Status: ASSIGNED → RESOLVED
Last Resolved: 9 years ago
Resolution: --- → FIXED
Whiteboard: [sg:critical?] using freed frame [needs addressing review comments and landing] → [sg:critical?] using freed frame
Target Milestone: --- → mozilla1.9.2a1
Flags: blocking1.9.0.6?
(Reporter)

Comment 20

9 years ago
Verified fixed, using:
Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.9.2a1pre) Gecko/20081208 Minefield/3.2a1pre
Status: RESOLVED → VERIFIED
Target Milestone: mozilla1.9.2a1 → ---
Flags: blocking1.9.0.6? → blocking1.9.0.6+
Fixed for 1.9.1:
http://hg.mozilla.org/releases/mozilla-1.9.1/rev/35ba7840d002
Keywords: fixed1.9.1
Comment on attachment 347804 [details] [diff] [review]
Patch rev. 3

Medium risk. No performance impact.
Attachment #347804 - Flags: approval1.9.0.6?
Comment on attachment 347804 [details] [diff] [review]
Patch rev. 3

Approved for 1.9.0.6, a=dveditz for release-drivers.
Attachment #347804 - Flags: approval1.9.0.6? → approval1.9.0.6+
Checked in on CVS trunk for 1.9.0.6:
mozilla/layout/generic/nsInlineFrame.cpp 	3.303
Keywords: fixed1.9.0.6

Comment 25

9 years ago
1.8 and 1.8.0 branches crash on this.
Flags: wanted1.8.1.x+
Flags: wanted1.8.0.x+
Flags: blocking1.8.1.next?
Flags: blocking1.8.0.next+

Comment 26

9 years ago
Created attachment 355345 [details] [diff] [review]
for 1.8

backport of attachment 347804 [details] [diff] [review] (Patch rev. 3) with just s/nsGkAtoms::/nsLayoutAtoms::/

Updated

9 years ago
Attachment #355345 - Flags: approval1.8.1.next?
Attachment #355345 - Flags: approval1.8.0.next?

Comment 27

9 years ago
Comment on attachment 355345 [details] [diff] [review]
for 1.8

verified that it fixes crash on 1.8.0 and 1.8 branches
Verified for 1.9.0.6 with Mozilla/5.0 (Macintosh; U; Intel Mac OS X 10.5; en-US; rv:1.9.0.6pre) Gecko/2009010504 GranParadiso/3.0.6pre.
Keywords: fixed1.9.0.6 → verified1.9.0.6
Flags: blocking1.8.1.next? → blocking1.8.1.next+
Comment on attachment 355345 [details] [diff] [review]
for 1.8

Approved for 1.8.1.21, a=dveditz for release-drivers.
Attachment #355345 - Flags: approval1.8.1.next? → approval1.8.1.next+

Comment 30

9 years ago
Checked in on CVS 1.8 branch for 1.8.1.21 ...

/cvsroot/mozilla/layout/generic/nsInlineFrame.cpp,v  <--  nsInlineFrame.cpp
new revision: 3.241.4.7; previous revision: 3.241.4.6
done
Keywords: fixed1.8.1.21

Updated

9 years ago
Attachment #355345 - Flags: approval1.8.0.next? → approval1.8.0.next+

Comment 31

9 years ago
Comment on attachment 355345 [details] [diff] [review]
for 1.8

a=asac for 1.8.0 branch
Verified fix on Mozilla/5.0 (Macintosh; U; Intel Mac OS X 10.5; en-US; rv:1.9.1b3pre) Gecko/20090122 Shiretoko/3.1b3pre
Keywords: fixed1.9.1 → verified1.9.1
Group: core-security

Updated

9 years ago
Flags: in-testsuite? → in-testsuite+
Crash Signature: [@ nsInlineFrame::ReflowFrames]
Blocks: 5588
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