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authortsepez <tsepez@chromium.org>2017-01-17 11:05:57 -0800
committerCommit bot <commit-bot@chromium.org>2017-01-17 11:05:57 -0800
commit783a7e048c677d26aaf3884304627bbe27cff546 (patch)
treeb03feaa32114472f54855c1b702e5bfda28d2be1 /xfa/fde/cfde_txtedtengine.cpp
parentb9fbe6e9af590a91ab030d2523a147e972816b32 (diff)
downloadpdfium-783a7e048c677d26aaf3884304627bbe27cff546.tar.xz
Avoid endless loop deleting CFGAS_GEFont.
It's a ref-counted class, so if we're in the destructor, the ref count has hit zero. We can't make a new ref pointer to itself here, as it will re-invoke the destructor when it goes out of scope. This should have been an obvious anti-pattern in hindsight. The object in question can't be in the m_pFontManager, since the font manager retains a reference, and we wouldn't get to this destructor while that is present. So the cleanup isn't required. Fixing this revealed a free-delete mismatch in cxfa_textlayout.cpp. I also converted to use unique_ptrs in a few places near this issue. Fixing this revealed a UAF in CFGAS_GEFont, memcpy'ing a RetainPtr is not a good idea as it doesn't bump the ref count. Also protect and friend the CFGAS_GEFont destructor, to make sure random deletes don't happen. Also kill off a const cast, and remove unnecessary conversion to retain_ptr when we already have one. TEST=look for absence of -11 in XFA corpus test logs, bots not currently noticing the segv. Argh. Review-Url: https://codereview.chromium.org/2631703003
Diffstat (limited to 'xfa/fde/cfde_txtedtengine.cpp')
-rw-r--r--xfa/fde/cfde_txtedtengine.cpp2
1 files changed, 1 insertions, 1 deletions
diff --git a/xfa/fde/cfde_txtedtengine.cpp b/xfa/fde/cfde_txtedtengine.cpp
index 8bb944712a..7ef6b3ff06 100644
--- a/xfa/fde/cfde_txtedtengine.cpp
+++ b/xfa/fde/cfde_txtedtengine.cpp
@@ -84,7 +84,7 @@ void CFDE_TxtEdtEngine::SetEditParams(const FDE_TXTEDTPARAMS& params) {
if (!m_pTextBreak)
m_pTextBreak = pdfium::MakeUnique<CFX_TxtBreak>(FX_TXTBREAKPOLICY_None);
- FXSYS_memcpy(&m_Param, &params, sizeof(FDE_TXTEDTPARAMS));
+ m_Param = params;
m_wLineEnd = params.wLineBreakChar;
m_bAutoLineEnd = (m_Param.nLineEnd == FDE_TXTEDIT_LINEEND_Auto);
UpdateTxtBreak();