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Add some checks on line size to avoid underflow, from san65384 at gmail

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dot com in GitHub issue 4955.
This commit is contained in:
nicm
2026-05-01 11:56:41 +00:00
parent 56200ca044
commit 2e9c6c2586
1 changed files with 8 additions and 0 deletions
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8
mode-tree.c
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@@ -301,6 +301,8 @@ mode_tree_clear_tagged(struct mode_tree_list *mtl)
void void
mode_tree_up(struct mode_tree_data *mtd, int wrap) mode_tree_up(struct mode_tree_data *mtd, int wrap)
{ {
if (mtd->line_size == 0)
return;
if (mtd->current == 0) { if (mtd->current == 0) {
if (wrap) { if (wrap) {
mtd->current = mtd->line_size - 1; mtd->current = mtd->line_size - 1;
@@ -317,6 +319,8 @@ mode_tree_up(struct mode_tree_data *mtd, int wrap)
int int
mode_tree_down(struct mode_tree_data *mtd, int wrap) mode_tree_down(struct mode_tree_data *mtd, int wrap)
{ {
if (mtd->line_size == 0)
return (0);
if (mtd->current == mtd->line_size - 1) { if (mtd->current == mtd->line_size - 1) {
if (wrap) { if (wrap) {
mtd->current = 0; mtd->current = 0;
@@ -363,6 +367,8 @@ mode_tree_swap(struct mode_tree_data *mtd, int direction)
void * void *
mode_tree_get_current(struct mode_tree_data *mtd) mode_tree_get_current(struct mode_tree_data *mtd)
{ {
if (mtd->line_size == 0)
return (NULL);
return (mtd->line_list[mtd->current].item->itemdata); return (mtd->line_list[mtd->current].item->itemdata);
} }
@@ -433,6 +439,8 @@ mode_tree_set_current(struct mode_tree_data *mtd, uint64_t tag)
return (1); return (1);
} }
if (mtd->current >= mtd->line_size) { if (mtd->current >= mtd->line_size) {
if (mtd->line_size == 0)
return (0);
mtd->current = mtd->line_size - 1; mtd->current = mtd->line_size - 1;
if (mtd->current > mtd->height - 1) if (mtd->current > mtd->height - 1)
mtd->offset = mtd->current - mtd->height + 1; mtd->offset = mtd->current - mtd->height + 1;