Commit: patch 9.2.0283: unnecessary (int) casts before alloc() calls

[Christian Brabandt]

patch 9.2.0283: unnecessary (int) casts before alloc() calls

Commit: https://github.com/vim/vim/commit/964b7b5d7b0b303e7d84a4949883374c691ec418
Author: Yasuhiro Matsumoto <matt...@gmail.com>
Date: Thu Apr 2 16:41:01 2026 +0000

patch 9.2.0283: unnecessary (int) casts before alloc() calls

Problem: unnecessary (int) casts before alloc() calls, can cause
truncation and heap overflows (sgInnora)
Solution: Remove casts (Yasuhiro Matsumoto)

alloc() already accepts size_t, so (int) casts on size_t values are
redundant and could theoretically cause truncation on values > INT_MAX.

Remove the casts and change alloc_cmdbuff() signature from int to
size_t to match.

Note: list_alloc_with_items() keeps its int parameter since lv_len and
lv_with_items are int, and the call site already has an INT_MAX guard.

fixes: #19888
closes: #19889

Signed-off-by: Yasuhiro Matsumoto <matt...@gmail.com>
Signed-off-by: Christian Brabandt <c...@256bit.org>

diff --git a/src/ex_getln.c b/src/ex_getln.c
index 97cc1601c..e1983de73 100644
--- a/src/ex_getln.c
+++ b/src/ex_getln.c
@@ -42,7 +42,7 @@ static void set_cmdspos(void);
static void set_cmdspos_cursor(void);
static void correct_cmdspos(int idx, int cells);
static void dealloc_cmdbuff(void);
-static void alloc_cmdbuff(int len);
+static void alloc_cmdbuff(size_t len);
static void draw_cmdline(int start, int len);
static void save_cmdline(cmdline_info_T *ccp);
static void restore_cmdline(cmdline_info_T *ccp);
@@ -1537,7 +1537,7 @@ cmdline_browse_history(
}
if (i == 0)
{
- alloc_cmdbuff((int)len);
+ alloc_cmdbuff(len);
if (ccline.cmdbuff == NULL)
{
res = GOTO_NORMAL_MODE;
@@ -1550,7 +1550,7 @@ cmdline_browse_history(
}
else
{
- alloc_cmdbuff((int)plen);
+ alloc_cmdbuff(plen);
if (ccline.cmdbuff == NULL)
{
res = GOTO_NORMAL_MODE;
@@ -3491,7 +3491,7 @@ dealloc_cmdbuff(void)
* Assigns the new buffer to ccline.cmdbuff and ccline.cmdbufflen.
*/
static void
-alloc_cmdbuff(int len)
+alloc_cmdbuff(size_t len)
{
/*
* give some extra space to avoid having to allocate all the time
@@ -3502,7 +3502,7 @@ alloc_cmdbuff(int len)
len += 20;

ccline.cmdbuff = alloc(len); // caller should check for out-of-memory
- ccline.cmdbufflen = len;
+ ccline.cmdbufflen = (int)len;
}

/*
diff --git a/src/memline.c b/src/memline.c
index 9cca5c2f4..97396b0b1 100644
--- a/src/memline.c
+++ b/src/memline.c
@@ -3674,7 +3674,7 @@ ml_replace_len(
size_t textproplen = curbuf->b_ml.ml_line_len - oldtextlen;

// Need to copy over text properties, stored after the text.
- newline = alloc(len + (int)textproplen);
+ newline = alloc(len + textproplen);
if (newline != NULL)
{
mch_memmove(newline, line, len);
diff --git a/src/popupwin.c b/src/popupwin.c
index ab207cd50..d54751600 100644
--- a/src/popupwin.c
+++ b/src/popupwin.c
@@ -5896,7 +5896,7 @@ popup_set_title(win_T *wp)

vim_free(wp->w_popup_title);
len = STRLEN(wp->w_buffer->b_fname) + 3;
- wp->w_popup_title = alloc((int)len);
+ wp->w_popup_title = alloc(len);
if (wp->w_popup_title != NULL)
vim_snprintf((char *)wp->w_popup_title, len, " %s ",
wp->w_buffer->b_fname);
diff --git a/src/session.c b/src/session.c
index 31a021b22..eed03269a 100644
--- a/src/session.c
+++ b/src/session.c
@@ -1099,7 +1099,7 @@ write_session_file(char_u *filename)
escaped_filename = vim_strsave_escaped(filename, escape_chars);
if (escaped_filename == NULL)
return FALSE;
- mksession_cmdline = alloc(10 + (int)STRLEN(escaped_filename) + 1);
+ mksession_cmdline = alloc(10 + STRLEN(escaped_filename) + 1);
if (mksession_cmdline == NULL)
{
vim_free(escaped_filename);
diff --git a/src/terminal.c b/src/terminal.c
index ecb0b52b3..0310ae9aa 100644
--- a/src/terminal.c
+++ b/src/terminal.c
@@ -5697,7 +5697,7 @@ get_separator(int text_width, char_u *fname)
int i;
size_t off;

- textline = alloc(width + (int)STRLEN(fname) + 1);
+ textline = alloc(width + STRLEN(fname) + 1);
if (textline == NULL)
return NULL;

diff --git a/src/version.c b/src/version.c
index a05e5f39b..964ce05f7 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 */
+/**/
+ 283,
/**/
282,
/**/
diff --git a/src/vim9expr.c b/src/vim9expr.c
index 89219996e..e12c87edd 100644
--- a/src/vim9expr.c
+++ b/src/vim9expr.c
@@ -3355,7 +3355,7 @@ compile_expr6(char_u **arg, cctx_T *cctx, ppconst_T *ppconst)
char_u *s2 = tv2->vval.v_string;
size_t len1 = STRLEN(s1);

- tv1->vval.v_string = alloc((int)(len1 + STRLEN(s2) + 1));
+ tv1->vval.v_string = alloc(len1 + STRLEN(s2) + 1);
if (tv1->vval.v_string == NULL)
{
clear_ppconst(ppconst);