From 60e1862ccba744c4252d30f043bb077c2c657427 Mon Sep 17 00:00:00 2001 From: Devon Gardner Date: Mon, 7 Oct 2024 23:22:09 +0000 Subject: [PATCH] fix(coverity/510275): linematch out of bounds access (#30687) Problem: Int pointer cast to unsigned long pointer causes potential memory corruption. Solution: Cast and store value first, then pass the new pointer. --- src/nvim/linematch.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/src/nvim/linematch.c b/src/nvim/linematch.c index 8943e6e8a6..39dfb8eeb9 100644 --- a/src/nvim/linematch.c +++ b/src/nvim/linematch.c @@ -150,7 +150,9 @@ static int count_n_matched_chars(mmfile_t **sp, const size_t n, bool iwhite) mmfile_t fastforward_buf_to_lnum(mmfile_t s, linenr_T lnum) { for (int i = 0; i < lnum - 1; i++) { - s.ptr = strnchr(s.ptr, (size_t *)&s.size, '\n'); + size_t n = (size_t)s.size; + s.ptr = strnchr(s.ptr, &n, '\n'); + s.size = (int)n; if (!s.ptr) { break; }