Commit: patch 9.1.2028: [security]: Buffer-overflow with incomplete multi-byte chars

[Christian Brabandt]

patch 9.1.2028: [security]: Buffer-overflow with incomplete multi-byte chars

Commit: https://github.com/vim/vim/commit/f99de42a9fbc2caaac2741a275b6c25421582cf4
Author: Christian Brabandt <c...@256bit.org>
Date: Sat Dec 27 15:43:37 2025 +0000

patch 9.1.2028: [security]: Buffer-overflow with incomplete multi-byte chars

Problem: Buffer overflow in buf_write() when converting incomplete
multi-byte characters (Kevin Goodsell)
Solution: Make the buffer slightly larger

closes: #19007

Signed-off-by: Christian Brabandt <c...@256bit.org>

diff --git a/src/bufwrite.c b/src/bufwrite.c
index c1a495318..77efb30de 100644
--- a/src/bufwrite.c
+++ b/src/bufwrite.c
@@ -229,6 +229,16 @@ buf_write_bytes(struct bw_info *ip)
else
c = buf[wlen];
}
+ // Check that there is enough space
+ if (!(flags & FIO_LATIN1))
+ {
+ size_t need = (flags & FIO_UCS4) ? 4 : 2;
+ if ((flags & FIO_UTF16) && c >= 0x10000)
+ need = 4;
+
+ if ((size_t)(p - ip->bw_conv_buf) + need > ip->bw_conv_buflen)
+ return FAIL;
+ }

if (ucs2bytes(c, &p, flags) && !ip->bw_conv_error)
{
@@ -1698,11 +1708,13 @@ buf_write(
wb_flags = get_fio_flags(fenc);
if (wb_flags & (FIO_UCS2 | FIO_UCS4 | FIO_UTF16 | FIO_UTF8))
{
+ // overallocate a bit, in case we read incomplete multi-byte chars
+ int size = bufsize + CONV_RESTLEN;
// Need to allocate a buffer to translate into.
if (wb_flags & (FIO_UCS2 | FIO_UTF16 | FIO_UTF8))
- write_info.bw_conv_buflen = bufsize * 2;
+ write_info.bw_conv_buflen = size * 2;
else // FIO_UCS4
- write_info.bw_conv_buflen = bufsize * 4;
+ write_info.bw_conv_buflen = size * 4;
write_info.bw_conv_buf = alloc(write_info.bw_conv_buflen);
if (write_info.bw_conv_buf == NULL)
end = 0;
diff --git a/src/testdir/samples/buffer-test.txt b/src/testdir/samples/buffer-test.txt
new file mode 100644
index 000000000..38f888007
--- /dev/null
+++ b/src/testdir/samples/buffer-test.txt
@@ -0,0 +1 @@
+0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef0123456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\ No newline at end of file
diff --git a/src/testdir/test_crash.vim b/src/testdir/test_crash.vim
index 01ae64fbd..9b673e4e2 100644
--- a/src/testdir/test_crash.vim
+++ b/src/testdir/test_crash.vim
@@ -261,4 +261,22 @@ func TearDown()
call delete('Untitled')
endfunc

+func Test_crash_bufwrite()
+ let lines =<< trim END
+ w! ++enc=ucs4 Xoutput
+ call writefile(['done'], 'Xbufwrite')
+ END
+ call writefile(lines, 'Xvimrc')
+ let opts = #{wait_for_ruler: 0, rows: 20}
+ let args = ' -u NONE -i NONE -b -S Xvimrc'
+ let buf = RunVimInTerminal(args .. ' samples/buffer-test.txt', opts)
+ call TermWait(buf, 1000)
+ call StopVimInTerminal(buf)
+ call WaitForAssert({-> assert_true(filereadable('Xbufwrite'))})
+ call assert_equal(['done'], readfile('Xbufwrite'))
+ call delete('Xbufwrite')
+ call delete('Xoutput')
+ call delete('Xvimrc')
+endfunc
+
" vim: shiftwidth=2 sts=2 expandtab
diff --git a/src/version.c b/src/version.c
index a4d0ed19a..0aa6ace8a 100644
--- a/src/version.c
+++ b/src/version.c
@@ -734,6 +734,8 @@ static char *(features[]) =

static int included_patches[] =
{ /* Add new patch number below this line */
+/**/
+ 2028,
/**/
2027,
/**/