Mercurial > vim
diff src/memfile.c @ 27453:c7f614c9ceb3 v8.2.4255
patch 8.2.4255: theoretical computation overflow
Commit: https://github.com/vim/vim/commit/d5cec1f1f055316c353cfa15ad8d5eb0952d50a0
Author: =?UTF-8?q?Dundar=20G=C3=B6c?= <gocdundar@gmail.com>
Date: Sat Jan 29 15:19:23 2022 +0000
patch 8.2.4255: theoretical computation overflow
Problem: Theoretical computation overflow.
Solution: Perform multiplication in a wider type. (closes https://github.com/vim/vim/issues/9657)
author | Bram Moolenaar <Bram@vim.org> |
---|---|
date | Sat, 29 Jan 2022 16:30:03 +0100 |
parents | aa65d1808bd0 |
children | 7a64222fad8e |
line wrap: on
line diff
--- a/src/memfile.c +++ b/src/memfile.c @@ -249,7 +249,7 @@ mf_close(memfile_T *mfp, int del_file) // free entries in used list for (hp = mfp->mf_used_first; hp != NULL; hp = nextp) { - total_mem_used -= hp->bh_page_count * mfp->mf_page_size; + total_mem_used -= (long_u)hp->bh_page_count * mfp->mf_page_size; nextp = hp->bh_next; mf_free_bhdr(hp); } @@ -359,7 +359,7 @@ mf_new(memfile_T *mfp, int negative, int } else if (hp == NULL) // need to allocate memory for this block { - if ((p = alloc(mfp->mf_page_size * page_count)) == NULL) + if ((p = alloc((size_t)mfp->mf_page_size * page_count)) == NULL) return NULL; hp = mf_rem_free(mfp); hp->bh_data = p; @@ -718,7 +718,7 @@ mf_ins_used(memfile_T *mfp, bhdr_T *hp) else hp->bh_next->bh_prev = hp; mfp->mf_used_count += hp->bh_page_count; - total_mem_used += hp->bh_page_count * mfp->mf_page_size; + total_mem_used += (long_u)hp->bh_page_count * mfp->mf_page_size; } /* @@ -736,7 +736,7 @@ mf_rem_used(memfile_T *mfp, bhdr_T *hp) else hp->bh_prev->bh_next = hp->bh_next; mfp->mf_used_count -= hp->bh_page_count; - total_mem_used -= hp->bh_page_count * mfp->mf_page_size; + total_mem_used -= (long_u)hp->bh_page_count * mfp->mf_page_size; } /* @@ -814,7 +814,8 @@ mf_release(memfile_T *mfp, int page_coun if (hp->bh_page_count != page_count) { vim_free(hp->bh_data); - if ((hp->bh_data = alloc(mfp->mf_page_size * page_count)) == NULL) + if ((hp->bh_data = alloc((size_t)mfp->mf_page_size * page_count)) + == NULL) { vim_free(hp); return NULL; @@ -881,7 +882,8 @@ mf_alloc_bhdr(memfile_T *mfp, int page_c if ((hp = ALLOC_ONE(bhdr_T)) != NULL) { - if ((hp->bh_data = alloc(mfp->mf_page_size * page_count)) == NULL) + if ((hp->bh_data = alloc((size_t)mfp->mf_page_size * page_count)) + == NULL) { vim_free(hp); // not enough memory return NULL;