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vim-patch:8.1.2018: using freed memory when out of memory and displaying message

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Problem:    Using freed memory when out of memory and displaying message.
Solution:   Make a copy of the message first.
e5fbd73930
This commit is contained in:
Jan Edmund Lazo
2020-05-31 17:01:28 -04:00
parent 310a56d0a0
commit 44531928b3
3 changed files with 12 additions and 10 deletions
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15
src/nvim/normal.c
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@@ -621,6 +621,8 @@ static void normal_redraw_mode_message(NormalState *s)
update_screen(0);
// now reset it, otherwise it's put in the history again
keep_msg = kmsg;
kmsg = vim_strsave(keep_msg);
msg_attr((const char *)kmsg, keep_msg_attr);
xfree(kmsg);
}
@@ -1265,10 +1267,15 @@ static void normal_redraw(NormalState *s)
// Display message after redraw. If an external message is still visible,
// it contains the kept message already.
if (keep_msg != NULL && !msg_ext_is_visible()) {
// msg_attr_keep() will set keep_msg to NULL, must free the string here.
// Don't reset keep_msg, msg_attr_keep() uses it to check for duplicates.
char *p = (char *)keep_msg;
msg_attr(p, keep_msg_attr);
char_u *const p = vim_strsave(keep_msg);
// msg_start() will set keep_msg to NULL, make a copy
// first. Don't reset keep_msg, msg_attr_keep() uses it to
// check for duplicates. Never put this message in
// history.
msg_hist_off = true;
msg_attr((const char *)p, keep_msg_attr);
msg_hist_off = false;
xfree(p);
}