vim-patch:9.2.0159: Crash when reading quickfix line

Problem:  Crash when reading quickfix line (Kaiyu Xie)
Solution: Make sure line is terminated by NUL

closes: vim/vim#19667

Supported by AI

8d13b8244a

Co-authored-by: Christian Brabandt <cb@256bit.org>

src/nvim/quickfix.c

@@ -815,6 +815,7 @@ retry:
     // Copy the read part of the line, excluding null-terminator
     memcpy(state->growbuf, IObuff, IOSIZE - 1);
     size_t growbuflen = state->linelen;
+    state->growbuf[growbuflen] = NUL;
 
     while (true) {
       errno = 0;

test/old/testdir/test_quickfix.vim

@@ -7014,4 +7014,19 @@ func Test_quickfixtextfunc_wipes_buffer()
   bw
 endfunc
 
+func Test_quickfix_longline_noeol()
+  CheckRunVimInTerminal
+  let qf = 'Xquickfix'
+  let args = $"-q {qf}"
+  let after =<< trim [CODE]
+    call writefile(['okay'], "XDONE")
+    qall!
+  [CODE]
+  defer delete("XDONE")
+  call writefile([repeat('A', 1024)], qf, 'bD')
+  call RunVim([], after, args)
+  call WaitForAssert({-> assert_true(filereadable("XDONE"))})
+  call assert_equal(['okay'], readfile("XDONE"))
+endfunc
+
 " vim: shiftwidth=2 sts=2 expandtab