When doing the sqlite3BtreeInsert() overwrite optimization, make sure the

memcpy() does not extend off the end of the page.

FossilOrigin-Name: 684ef4582ed19b2af22dda6fc085c70464f92f1b

manifest

@@ -1,5 +1,5 @@
-C Additional\scomments\sand\san\sassert\son\sthe\ssqlite3BtreeInsert()\soverwrite\noptimization.
-D 2016-12-09T18:09:42.258
+C When\sdoing\sthe\ssqlite3BtreeInsert()\soverwrite\soptimization,\smake\ssure\sthe\nmemcpy()\sdoes\snot\sextend\soff\sthe\send\sof\sthe\spage.
+D 2016-12-09T19:42:18.129
 F Makefile.in 7639c6a09da11a9c7c6f2630fc981ee588d1072d
 F Makefile.linux-gcc 7bc79876b875010e8c8f9502eb935ca92aa3c434
 F Makefile.msc b8ca53350ae545e3562403d5da2a69cec79308da
@@ -331,7 +331,7 @@ F src/auth.c 930b376a9c56998557367e6f7f8aaeac82a2a792
 F src/backup.c faf17e60b43233c214aae6a8179d24503a61e83b
 F src/bitvec.c 17ea48eff8ba979f1f5b04cc484c7bb2be632f33
 F src/btmutex.c bc87dd3b062cc26edfe79918de2200ccb8d41e73
-F src/btree.c 38bc160dfb270b4e005b23672310096c78eed4c8
+F src/btree.c 217c9900de7cf04997aff25faabc366cfe84e8f1
 F src/btree.h 2349a588abcd7e0c04f984e15c5c777b61637583
 F src/btreeInt.h 10c4b77c2fb399580babbcc7cf652ac10dba796e
 F src/build.c 178f16698cbcb43402c343a9413fe22c99ffee21
@@ -1536,7 +1536,7 @@ F vsixtest/vsixtest.tcl 6a9a6ab600c25a91a7acc6293828957a386a8a93
 F vsixtest/vsixtest.vcxproj.data 2ed517e100c66dc455b492e1a33350c1b20fbcdc
 F vsixtest/vsixtest.vcxproj.filters 37e51ffedcdb064aad6ff33b6148725226cd608e
 F vsixtest/vsixtest_TemporaryKey.pfx e5b1b036facdb453873e7084e1cae9102ccc67a0
-P 0b86fbca6615ccf1f3a62614db577a8acbec6d9e
-R 11e5ca14997252e736d13429f6c59d06
+P c1f0ae9d2981a19875103750379ad26f2575f878
+R 956ba83a1c02ce8b54106bed68f282ac
 U drh
-Z db8419761e0f22ff22785868538d89ab
+Z 1db7deef38744b5038e919d70ebcde44

manifest.uuid

@@ -1 +1 @@
-c1f0ae9d2981a19875103750379ad26f2575f878
+684ef4582ed19b2af22dda6fc085c70464f92f1b

src/btree.c

@@ -8068,6 +8068,7 @@ int sqlite3BtreeInsert(
       ** doing that is no faster then skipping this optimization and just
       ** calling dropCell() and insertCell(). */
       assert( rc==SQLITE_OK ); /* clearCell never fails when nLocal==nPayload */
+      if( oldCell+szNew > pPage->aDataEnd ) return SQLITE_CORRUPT_BKPT;
       memcpy(oldCell, newCell, szNew);
       return SQLITE_OK;
     }