patch 9.1.0648: [security] double-free in dialog_changed()
Commit:
https://github.com/vim/vim/commit/b29f4abcd4b3382fa746edd1d0562b7b48c9de60
Author: Christian Brabandt <c...@256bit.org>
Date: Thu Aug 1 22:10:28 2024 +0200
patch 9.1.0648: [security] double-free in dialog_changed()
Problem: [security] double-free in dialog_changed()
(SuyueGuo)
Solution: Only clear pointer b_sfname pointer, if it is different
than the b_ffname pointer. Don't try to free b_fname,
set it to NULL instead.
fixes: #15403
Github Advisory:
https://github.com/vim/vim/security/advisories/GHSA-46pw-v7qw-xc2f
Signed-off-by: Christian Brabandt <c...@256bit.org>
diff --git a/src/ex_cmds2.c b/src/ex_cmds2.c
index ce30b8d39..0d76b3b27 100644
--- a/src/ex_cmds2.c
+++ b/src/ex_cmds2.c
@@ -197,9 +197,11 @@ dialog_changed(
// restore to empty when write failed
if (empty_bufname)
{
- VIM_CLEAR(buf->b_fname);
+ // prevent double free
+ if (buf->b_sfname != buf->b_ffname)
+ VIM_CLEAR(buf->b_sfname);
+ buf->b_fname = NULL;
VIM_CLEAR(buf->b_ffname);
- VIM_CLEAR(buf->b_sfname);
unchanged(buf, TRUE, FALSE);
}
}
diff --git a/src/testdir/crash/dialog_changed_uaf
b/src/testdir/crash/dialog_changed_uaf
new file mode 100644
index
0000000000000000000000000000000000000000..e37d18d6daca107697bd19934b34054aa09e48a4
GIT binary patch
literal 552
zcmaKo!A{gb7=ZsSVA4N<B{3lzPeW6)o32GS;$lijP<BHgK%>z`lOEb_XQfzXmQI(h
zB_W$|Q|}&p0gqgG09c>IH^2vQY{3M*_}ymyN#^^0FRs_?L|EK)74X^j4ecMS-5Wsu
ztYZDu8)Q5_@S;j%$FkMAXqH#zri;;d{9}C0foYngn`Pg2S(e#t+di{xdkfcJZ#-YW
zy^nlM1x5l22mlTmYpSX&EiuOS8FOlh*A>`w+giMgG<?DGe<8rqNXqI7KIwEigL$IB
zcENdwQ&LVL;?c1<erFNvrbq)cdswKJZ<7}PPP=<^0EoUS&`Q@nH=R97Cj6%%8w@>s
z&=7u1Afp5YM_QX*rLJq5EF4;aQxkH;9>eHEzKnaxL*tp*h|1+s8TnTJhO{o5uB#zn
zR~QCGL;Dhtc_j}O>_TIY90vtWh~I;mP0>evFr-9~$(aE3+QLF>5@_F0c^amRVL}=2
z@%a6HJ$CRA;g^(h`U-#!`?(x=;2`@L|8M6}W#`bc?_}9&wo(+n4gHu4-b+ls|0hk=
buhVkxmBKq0EhW_}{Zl))e5nDWDZ=PC8xf-<
literal 0
HcmV?d00001
diff --git a/src/testdir/test_crash.vim b/src/testdir/test_crash.vim
index 29061aa42..9aef24502 100644
--- a/src/testdir/test_crash.vim
+++ b/src/testdir/test_crash.vim
@@ -196,6 +196,12 @@ func Test_crash1_3()
call term_sendkeys(buf, args)
call TermWait(buf, 50)
+ let file = 'crash/dialog_changed_uaf'
+ let cmn_args = "%s -u NONE -i NONE -n -e -s -S %s -c ':qa!'\<cr>"
+ let args = printf(cmn_args, vim, file)
+ call term_sendkeys(buf, args)
+ call TermWait(buf, 150)
+
" clean up
exe buf .. "bw!"
bw!
diff --git a/src/version.c b/src/version.c
index 0e49ebd7a..3ca600126 100644
--- a/src/version.c
+++ b/src/version.c
@@ -704,6 +704,8 @@ static char *(features[]) =
static int included_patches[] =
{ /* Add new patch number below this line */
+/**/
+ 648,
/**/
647,
/**/
--
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