commit 15d9890eee53afc61eb0a03b878a19cb5672f732
author Bram Moolenaar <Bram@vim.org> Thu Nov 04 15:46:05 2021 +0000
committer Bram Moolenaar <Bram@vim.org> Thu Nov 04 15:46:05 2021 +0000
tree 3f784dedd6d11db994fbb6440e10fe4838ec2314
parent 0b5b06cb4777d1401fdf83e7d48d287662236e7e

patch 8.2.3582: reading uninitialized memory when giving spell suggestions

Problem:    Reading uninitialized memory when giving spell suggestions.
Solution:   Check that preword is not empty.

src/spellsuggest.c

diff --git a/src/spellsuggest.c b/src/spellsuggest.c
index a6dbc78..255f94d 100644
--- a/src/spellsuggest.c
+++ b/src/spellsuggest.c
@@ -1619,7 +1619,7 @@
 		    // char, e.g., "thes," -> "these".
 		    p = fword + sp->ts_fidx;
 		    MB_PTR_BACK(fword, p);
-		    if (!spell_iswordp(p, curwin))
+		    if (!spell_iswordp(p, curwin) && *preword != NUL)
 		    {
 			p = preword + STRLEN(preword);
 			MB_PTR_BACK(preword, p);