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The MemPage.aDataEnd field should point to the end of the data buffer for

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the page, not just the end of the usable portion of that buffer.  The purpose
aDataEnd is to detect cells that overflow the page, and that won't work on a
page with reserved bytes and a cell that starts in the reserved region, unless
the boundary is at the very end of the page. Chromium issue 1276294.

FossilOrigin-Name: f839c0bc8388a31f6db5081906b66b9e129855ba27a13cf13bd995b083f7386e
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drh
2022-03-01 20:15:04 +00:00
parent 3b4cb719c0
commit a055abb8c4
4 changed files with 13 additions and 11 deletions
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4
src/btreeInt.h
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@@ -293,7 +293,9 @@ struct MemPage {
u8 *apOvfl[4]; /* Pointers to the body of overflow cells */
BtShared *pBt; /* Pointer to BtShared that this page is part of */
u8 *aData; /* Pointer to disk image of the page data */
u8 *aDataEnd; /* One byte past the end of usable data */
u8 *aDataEnd; /* One byte past the end of the entire page - not just
** the usable space, the entire page. Used to prevent
** corruption-induced of buffer overflow. */
u8 *aCellIdx; /* The cell index area */
u8 *aDataOfst; /* Same as aData for leaves. aData+4 for interior */
DbPage *pDbPage; /* Pager page handle */