patch 9.1.0678: [security]: use-after-free in alist_add()
Problem: [security]: use-after-free in alist_add()
(SuyueGuo)
Solution: Lock the current window, so that the reference to
the argument list remains valid.
This fixes CVE-2024-43374
Signed-off-by: Christian Brabandt <cb@256bit.org>
diff --git a/src/window.c b/src/window.c
index 43a15e0..b2c90c7 100644
--- a/src/window.c
+++ b/src/window.c
@@ -2511,7 +2511,7 @@
for (wp = firstwin; wp != NULL && !ONE_WINDOW; )
{
if (wp->w_buffer == buf && (!keep_curwin || wp != curwin)
- && !(wp->w_closing || wp->w_buffer->b_locked > 0))
+ && !(win_locked(wp) || wp->w_buffer->b_locked > 0))
{
if (win_close(wp, FALSE) == FAIL)
// If closing the window fails give up, to avoid looping
@@ -2532,7 +2532,7 @@
if (tp != curtab)
FOR_ALL_WINDOWS_IN_TAB(tp, wp)
if (wp->w_buffer == buf
- && !(wp->w_closing || wp->w_buffer->b_locked > 0))
+ && !(win_locked(wp) || wp->w_buffer->b_locked > 0))
{
win_close_othertab(wp, FALSE, tp);
@@ -2654,10 +2654,10 @@
bufref_T bufref;
set_bufref(&bufref, curbuf);
- win->w_closing = TRUE;
+ win->w_locked = TRUE;
close_buffer(win, win->w_buffer, action, abort_if_last, TRUE);
if (win_valid_any_tab(win))
- win->w_closing = FALSE;
+ win->w_locked = FALSE;
// Make sure curbuf is valid. It can become invalid if 'bufhidden' is
// "wipe".
if (!bufref_valid(&bufref))
@@ -2705,7 +2705,7 @@
if (window_layout_locked(CMD_close))
return FAIL;
- if (win->w_closing || (win->w_buffer != NULL
+ if (win_locked(win) || (win->w_buffer != NULL
&& win->w_buffer->b_locked > 0))
return FAIL; // window is already being closed
if (win_unlisted(win))
@@ -2754,19 +2754,19 @@
other_buffer = TRUE;
if (!win_valid(win))
return FAIL;
- win->w_closing = TRUE;
+ win->w_locked = TRUE;
apply_autocmds(EVENT_BUFLEAVE, NULL, NULL, FALSE, curbuf);
if (!win_valid(win))
return FAIL;
- win->w_closing = FALSE;
+ win->w_locked = FALSE;
if (last_window())
return FAIL;
}
- win->w_closing = TRUE;
+ win->w_locked = TRUE;
apply_autocmds(EVENT_WINLEAVE, NULL, NULL, FALSE, curbuf);
if (!win_valid(win))
return FAIL;
- win->w_closing = FALSE;
+ win->w_locked = FALSE;
if (last_window())
return FAIL;
#ifdef FEAT_EVAL
@@ -3346,7 +3346,7 @@
// Get here with win->w_buffer == NULL when win_close() detects the tab
// page changed.
- if (win->w_closing || (win->w_buffer != NULL
+ if (win_locked(win) || (win->w_buffer != NULL
&& win->w_buffer->b_locked > 0))
return; // window is already being closed
@@ -8000,3 +8000,12 @@
{
return last_win_id;
}
+
+/*
+ * Don't let autocommands close the given window
+ */
+ int
+win_locked(win_T *wp)
+{
+ return wp->w_locked;
+}