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Overview
Comment:Fix a possible buffer overwrite in the ".import" command. forum post 0c447f0548.
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SHA3-256: 0fd958fa9b56a8ef254127e29800ca2a267590e86edf739bd339239b25a5da6e
User & Date: dan 2024-05-27 11:35:05
Context
2024-05-27
13:24
For compatibility with PostgreSQL, when right-hand side of the ->> operator is negative, it should index from the right side of the JSON array on the left-hand side. (check-in: 82365a45 user: drh tags: trunk)
11:38
Fix a possible buffer overwrite in the ".import" command. (check-in: 55eee9f9 user: drh tags: branch-3.46)
11:35
Fix a possible buffer overwrite in the ".import" command. forum post 0c447f0548. (check-in: 0fd958fa user: dan tags: trunk)
11:31
Add new assert() statements to help out a static analyzer. Response to forum post 17fe8ac32e0de4f5. (check-in: 857f6d53 user: drh tags: trunk)
Changes
Unified Diff Ignore Whitespace Patch
Changes to src/shell.c.in.
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    }
    zSql = sqlite3_mprintf("SELECT count(*) FROM pragma_table_info(%Q,%Q);",
                           zTable, zSchema);
    if( zSql==0 ){
      import_cleanup(&sCtx);
      shell_out_of_memory();
    }
    nByte = strlen(zSql);    
    rc =  sqlite3_prepare_v2(p->db, zSql, -1, &pStmt, 0);
    sqlite3_free(zSql);
    zSql = 0;
    if( rc ){
      if (pStmt) sqlite3_finalize(pStmt);
      eputf("Error: %s\n", sqlite3_errmsg(p->db));
      import_cleanup(&sCtx);
      rc = 1;
      goto meta_command_exit;
    }
    if( sqlite3_step(pStmt)==SQLITE_ROW ){
      nCol = sqlite3_column_int(pStmt, 0);
    }else{
      nCol = 0;
    }
    sqlite3_finalize(pStmt);
    pStmt = 0;
    if( nCol==0 ) return 0; /* no columns, no error */





    zSql = sqlite3_malloc64( nByte*2 + 20 + nCol*2 );
    if( zSql==0 ){
      import_cleanup(&sCtx);
      shell_out_of_memory();
    }
    if( zSchema ){
      sqlite3_snprintf(nByte+20, zSql, "INSERT INTO \"%w\".\"%w\" VALUES(?", 
                       zSchema, zTable);
    }else{
      sqlite3_snprintf(nByte+20, zSql, "INSERT INTO \"%w\" VALUES(?", zTable);
    }
    j = strlen30(zSql);
    for(i=1; i<nCol; i++){
      zSql[j++] = ',';
      zSql[j++] = '?';
    }
    zSql[j++] = ')';
    zSql[j] = 0;

    if( eVerbose>=2 ){
      oputf("Insert using: %s\n", zSql);
    }
    rc = sqlite3_prepare_v2(p->db, zSql, -1, &pStmt, 0);
    sqlite3_free(zSql);
    zSql = 0;
    if( rc ){








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    }
    zSql = sqlite3_mprintf("SELECT count(*) FROM pragma_table_info(%Q,%Q);",
                           zTable, zSchema);
    if( zSql==0 ){
      import_cleanup(&sCtx);
      shell_out_of_memory();
    }

    rc =  sqlite3_prepare_v2(p->db, zSql, -1, &pStmt, 0);
    sqlite3_free(zSql);
    zSql = 0;
    if( rc ){
      if (pStmt) sqlite3_finalize(pStmt);
      eputf("Error: %s\n", sqlite3_errmsg(p->db));
      import_cleanup(&sCtx);
      rc = 1;
      goto meta_command_exit;
    }
    if( sqlite3_step(pStmt)==SQLITE_ROW ){
      nCol = sqlite3_column_int(pStmt, 0);
    }else{
      nCol = 0;
    }
    sqlite3_finalize(pStmt);
    pStmt = 0;
    if( nCol==0 ) return 0; /* no columns, no error */

    nByte = 64                 /* space for "INSERT INTO", "VALUES(", ")\0" */
          + (zSchema ? strlen(zSchema)*2 + 2: 0)  /* Quoted schema name */
          + strlen(zTable)*2 + 2                  /* Quoted table name */
          + nCol*2;            /* Space for ",?" for each column */
    zSql = sqlite3_malloc64( nByte );
    if( zSql==0 ){
      import_cleanup(&sCtx);
      shell_out_of_memory();
    }
    if( zSchema ){
      sqlite3_snprintf(nByte, zSql, "INSERT INTO \"%w\".\"%w\" VALUES(?", 
                       zSchema, zTable);
    }else{
      sqlite3_snprintf(nByte, zSql, "INSERT INTO \"%w\" VALUES(?", zTable);
    }
    j = strlen30(zSql);
    for(i=1; i<nCol; i++){
      zSql[j++] = ',';
      zSql[j++] = '?';
    }
    zSql[j++] = ')';
    zSql[j] = 0;
    assert( j<nByte );
    if( eVerbose>=2 ){
      oputf("Insert using: %s\n", zSql);
    }
    rc = sqlite3_prepare_v2(p->db, zSql, -1, &pStmt, 0);
    sqlite3_free(zSql);
    zSql = 0;
    if( rc ){
︙︙
Changes to test/shell5.test.
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  puts $out {aaa|bbb}
  close $out
  forcedelete test.db
  catchcmd :memory: {CREATE TABLE t1(a TEXT, b TEXT, c AS (a||b));
.import shell5.csv t1
SELECT * FROM t1;}
} {0 aaa|bbb|aaabbb}













finish_test








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  puts $out {aaa|bbb}
  close $out
  forcedelete test.db
  catchcmd :memory: {CREATE TABLE t1(a TEXT, b TEXT, c AS (a||b));
.import shell5.csv t1
SELECT * FROM t1;}
} {0 aaa|bbb|aaabbb}

#-------------------------------------------------------------------------

do_test shell5-8.1 {

  set out [open shell5.csv w]
  fconfigure $out -translation lf
  puts $out x
  close $out

  catchcmd :memory: {.import --csv shell5.csv '""""""""""""""""""""""""""""""""""""""""""""""'}
} {0 {}}

finish_test