Fix a use-after-free problem in the shell tool code that could occur if an SQL

statement were executed after an ".open" command with invalid options.

FossilOrigin-Name: ac760db0727209db0a816e112ea5f47e54d54dac

manifest

@@ -1,5 +1,5 @@
-C Make\sPATH\shandling\smore\srobust\sin\sthe\sbatch\stools\sfor\sMSVC.
-D 2017-02-27T17:16:27.906
+C Fix\sa\suse-after-free\sproblem\sin\sthe\sshell\stool\scode\sthat\scould\soccur\sif\san\sSQL\nstatement\swere\sexecuted\safter\san\s".open"\scommand\swith\sinvalid\soptions.
+D 2017-03-01T11:30:27.730
 F Makefile.in edb6bcdd37748d2b1c3422ff727c748df7ffe918
 F Makefile.linux-gcc 7bc79876b875010e8c8f9502eb935ca92aa3c434
 F Makefile.msc a89ea37ab5928026001569f056973b9059492fe2
@@ -397,7 +397,7 @@ F src/random.c 80f5d666f23feb3e6665a6ce04c7197212a88384
 F src/resolve.c f9bc0de45a30a450da47b3766de00be89bf9be79
 F src/rowset.c 7b7e7e479212e65b723bf40128c7b36dc5afdfac
 F src/select.c d12f3539f80db38b09015561b569e0eb1c4b6c5f
-F src/shell.c bf976d5301be9d8a4c52852c97909cc9a41ee20d
+F src/shell.c 27d2b31099fd2cd749e44d025ef9b54ca26692cb
 F src/sqlite.h.in 4d0c08f8640c586564a7032b259c5f69bf397850
 F src/sqlite3.rc 5121c9e10c3964d5755191c80dd1180c122fc3a8
 F src/sqlite3ext.h 8648034aa702469afb553231677306cc6492a1ae
@@ -1559,7 +1559,7 @@ F vsixtest/vsixtest.tcl 6a9a6ab600c25a91a7acc6293828957a386a8a93
 F vsixtest/vsixtest.vcxproj.data 2ed517e100c66dc455b492e1a33350c1b20fbcdc
 F vsixtest/vsixtest.vcxproj.filters 37e51ffedcdb064aad6ff33b6148725226cd608e
 F vsixtest/vsixtest_TemporaryKey.pfx e5b1b036facdb453873e7084e1cae9102ccc67a0
-P 2b210d691462b463796e7948399133c296e89ebf
-R 2fadaa28e86ebe3a08aafa06769bc23f
-U mistachkin
-Z 6b968b4fe877e63444beda0443031271
+P 23a8917e848a999533bc66467f7cb2f4f3d45bc1
+R 6f5948ee4f1d68e0584e854f4c330a6f
+U dan
+Z 4914d52d58dfba6bed9b5d6006acef82

manifest.uuid

@@ -1 +1 @@
-23a8917e848a999533bc66467f7cb2f4f3d45bc1
+ac760db0727209db0a816e112ea5f47e54d54dac

src/shell.c

@@ -4344,6 +4344,7 @@ static int do_meta_command(char *zLine, ShellState *p){
     session_close_all(p);
     sqlite3_close(p->db);
     p->db = 0;
+    p->zDbFilename = 0;
     sqlite3_free(p->zFreeOnClose);
     p->zFreeOnClose = 0;
     /* Check for command-line arguments */