vim is vulnerable to Use After Free Problem: Checking first character of url twice.
reference: https://github.com/vim/vim/commit/35a9a00afcb20897d462a766793ff45534810dc3 Signed-off-by: Minjae Kim <flower...@gmail.com> --- .../vim/files/CVE-2021-3796.patch | 50 +++++++++++++++++++ 1 file changed, 50 insertions(+) create mode 100644 meta/recipes-support/vim/files/CVE-2021-3796.patch diff --git a/meta/recipes-support/vim/files/CVE-2021-3796.patch b/meta/recipes-support/vim/files/CVE-2021-3796.patch new file mode 100644 index 0000000000..666bd5c48b --- /dev/null +++ b/meta/recipes-support/vim/files/CVE-2021-3796.patch @@ -0,0 +1,50 @@ +From 6d02e1429771c00046b48f26e53ca4123c3ce4e1 Mon Sep 17 00:00:00 2001 +From: Bram Moolenaar <b...@vim.org> +Date: Fri, 24 Sep 2021 16:01:09 +0800 +Subject: [PATCH] patch 8.2.3428: using freed memory when replacing + +Problem: Using freed memory when replacing. (Dhiraj Mishra) +Solution: Get the line pointer after calling ins_copychar(). + +Upstream-Status: Backport [https://github.com/vim/vim/commit/35a9a00afcb20897d462a766793ff45534810dc3] +CVE: CVE-2021-3796 + +Signed-off-by: Minjae Kim <flower...@gmail.com> +--- + src/normal.c | 10 +++++++--- + 1 file changed, 7 insertions(+), 3 deletions(-) + +diff --git a/src/normal.c b/src/normal.c +index c4963e621..305b514bc 100644 +--- a/src/normal.c ++++ b/src/normal.c +@@ -5009,19 +5009,23 @@ nv_replace(cmdarg_T *cap) + { + /* + * Get ptr again, because u_save and/or showmatch() will have +- * released the line. At the same time we let know that the +- * line will be changed. ++ * released the line. This may also happen in ins_copychar(). ++ * At the same time we let know that the line will be changed. + */ +- ptr = ml_get_buf(curbuf, curwin->w_cursor.lnum, TRUE); + if (cap->nchar == Ctrl_E || cap->nchar == Ctrl_Y) + { + int c = ins_copychar(curwin->w_cursor.lnum + + (cap->nchar == Ctrl_Y ? -1 : 1)); ++ ++ ptr = ml_get_buf(curbuf, curwin->w_cursor.lnum, TRUE); + if (c != NUL) + ptr[curwin->w_cursor.col] = c; + } + else ++ { ++ ptr = ml_get_buf(curbuf, curwin->w_cursor.lnum, TRUE); + ptr[curwin->w_cursor.col] = cap->nchar; ++ } + if (p_sm && msg_silent == 0) + showmatch(cap->nchar); + ++curwin->w_cursor.col; +-- +2.17.1 + -- 2.30.1 (Apple Git-130)
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