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commit aa17f0e0c1c8b3f1d6fc8617613c74f07de66fae
Author: Nicholas Marriott <nicholas.marriott@gmail.com>
Date: Thu Mar 21 11:37:09 2024 +0000
Fix crash if SIXEL colour register is invalid and remove SIXEL images before
reflow to avoid a different crash, from Anindya Mukherjee.
Origin: upstream, https://github.com/tmux/tmux/commit/aa17f0e0c1c8b3f1d6fc8617613c74f07de66fae
diff --git a/image-sixel.c b/image-sixel.c
index 3396a22a7f..e23d17f902 100644
--- a/image-sixel.c
+++ b/image-sixel.c
@@ -489,6 +489,9 @@ sixel_print(struct sixel_image *si, struct sixel_image *map, size_t *size)
colours = si->colours;
ncolours = si->ncolours;
}
+
+ if (ncolours == 0)
+ return (NULL);
contains = xcalloc(1, ncolours);
len = 8192;
diff --git a/input.c b/input.c
index eb421b280e..e6016121ff 100644
--- a/input.c
+++ b/input.c
@@ -1839,7 +1839,7 @@ input_csi_dispatch_sm_private(struct input_ctx *ictx)
/* Handle CSI graphics SM. */
static void
-input_csi_dispatch_sm_graphics(struct input_ctx *ictx)
+input_csi_dispatch_sm_graphics(__unused struct input_ctx *ictx)
{
#ifdef ENABLE_SIXEL
int n, m, o;
diff --git a/screen-write.c b/screen-write.c
index 6892d04149..a732f093dc 100644
--- a/screen-write.c
+++ b/screen-write.c
@@ -2283,6 +2283,10 @@ screen_write_sixelimage(struct screen_write_ctx *ctx, struct sixel_image *si,
new = sixel_scale(si, 0, 0, 0, y - sy, sx, sy, 1);
sixel_free(si);
si = new;
+
+ /* Bail out if the image cannot be scaled. */
+ if (si == NULL)
+ return;
sixel_size_in_cells(si, &x, &y);
}
diff --git a/screen.c b/screen.c
index f73a850547..0eaf469886 100644
--- a/screen.c
+++ b/screen.c
@@ -308,12 +308,12 @@ screen_resize_cursor(struct screen *s, u_int sx, u_int sy, int reflow,
if (sy != screen_size_y(s))
screen_resize_y(s, sy, eat_empty, &cy);
- if (reflow) {
#ifdef ENABLE_SIXEL
- image_free_all(s);
+ image_free_all(s);
#endif
+
+ if (reflow)
screen_reflow(s, sx, &cx, &cy, cursor);
- }
if (cy >= s->grid->hsize) {
s->cx = cx;
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