Earlier detection of corruption in the rtreecheck() SQL function to prevent

a (harmless) read of an uninitialized value.

FossilOrigin-Name: e2074b24788149562b15022ccd2784d6649f08ebc41410e3bfb2401baf0892e2

ext/rtree/rtree.c

@@ -759,7 +759,7 @@ static int nodeAcquire(
   ** are the leaves, and so on. If the depth as specified on the root node
   ** is greater than RTREE_MAX_DEPTH, the r-tree structure must be corrupt.
   */
-  if( pNode && iNode==1 ){
+  if( pNode && rc==SQLITE_OK && iNode==1 ){
     pRtree->iDepth = readInt16(pNode->zData);
     if( pRtree->iDepth>RTREE_MAX_DEPTH ){
       rc = SQLITE_CORRUPT_VTAB;

manifest

@@ -1,5 +1,5 @@
-C Prevent\suse-after-free\sof\sthe\su.vtab.idxStr\sstring\sfollowing\san\sOOM\nwhile\sgenerating\sthe\sOP_VFilter\sopcode.
-D 2020-09-17T11:32:14.578
+C Earlier\sdetection\sof\scorruption\sin\sthe\srtreecheck()\sSQL\sfunction\sto\sprevent\na\s(harmless)\sread\sof\san\suninitialized\svalue.
+D 2020-09-17T11:56:04.753
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 F .fossil-settings/ignore-glob 35175cdfcf539b2318cb04a9901442804be81cd677d8b889fcc9149c21f239ea
 F LICENSE.md df5091916dbb40e6e9686186587125e1b2ff51f022cc334e886c19a0e9982724
@@ -388,7 +388,7 @@ F ext/repair/test/checkindex01.test b530f141413b587c9eb78ff734de6bb79bc3515c3350
 F ext/repair/test/test.tcl 686d76d888dffd021f64260abf29a55c57b2cedfa7fc69150b42b1d6119aac3c
 F ext/rtree/README 6315c0d73ebf0ec40dedb5aa0e942bc8b54e3761
 F ext/rtree/geopoly.c f15cc6845d64a629035627d863cbe3eadc9cb30f9ca77bd823b0ca8a5a3f8b00
-F ext/rtree/rtree.c f87ffcc91f49272862119cfdd256b02514351893786a710d88f85933790608d4
+F ext/rtree/rtree.c 60f6f1675134201974be4189dbd219494c13e1ed30e80bd92ae0dcc86df1b035
 F ext/rtree/rtree.h 4a690463901cb5e6127cf05eb8e642f127012fd5003830dbc974eca5802d9412
 F ext/rtree/rtree1.test 00792b030a4e188ff1b22e8530e8aa0452bb5dd81c2b18cb004afc7dc63e040e
 F ext/rtree/rtree2.test 9d9deddbb16fd0c30c36e6b4fdc3ee3132d765567f0f9432ee71e1303d32603d
@@ -1880,7 +1880,7 @@ F vsixtest/vsixtest.tcl 6a9a6ab600c25a91a7acc6293828957a386a8a93
 F vsixtest/vsixtest.vcxproj.data 2ed517e100c66dc455b492e1a33350c1b20fbcdc
 F vsixtest/vsixtest.vcxproj.filters 37e51ffedcdb064aad6ff33b6148725226cd608e
 F vsixtest/vsixtest_TemporaryKey.pfx e5b1b036facdb453873e7084e1cae9102ccc67a0
-P 7d2b590d3abd66a7e6ae9046198eb669e0fd2f223f7691281e9ad795a12b8903
-R 64b915f5a215a95424570ee566dcd81b
+P 751fe4edb2d4602e652523c2759de3f4fffd29d5c66cae68caf45b30fd8b750a
+R 46006fc1e92c35a627434427e02a14ec
 U drh
-Z ee1bdda50dc146e98a6a3caca7097de2
+Z 71d35069d355b0f119ebbc1395c98fe2

manifest.uuid

@@ -1 +1 @@
-751fe4edb2d4602e652523c2759de3f4fffd29d5c66cae68caf45b30fd8b750a
+e2074b24788149562b15022ccd2784d6649f08ebc41410e3bfb2401baf0892e2