[PATCH] staging: sm750fb: fix division by zero in ps_to_hz()

[Junrui Luo]

ps_to_hz() is called from hw_sm750_crtc_set_mode() without validating
that pixclock is non-zero. A zero pixclock passed via FBIOPUT_VSCREENINFO
causes a division by zero.

Fix by rejecting zero pixclock in lynxfb_ops_check_var(), consistent
with other framebuffer drivers.

Fixes: 81dee67e215b ("staging: sm750fb: add sm750 to staging")
Reported-by: Yuhao Jiang <danisjiang@xxxxxxxxx>
Cc: stable@xxxxxxxxxxxxxxx
Signed-off-by: Junrui Luo <moonafterrain@xxxxxxxxxxx>
---
 drivers/staging/sm750fb/sm750.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/staging/sm750fb/sm750.c b/drivers/staging/sm750fb/sm750.c
index 62f6e0cdff4d..18433aebb4dc 100644
--- a/drivers/staging/sm750fb/sm750.c
+++ b/drivers/staging/sm750fb/sm750.c
@@ -490,6 +490,9 @@ static int lynxfb_ops_check_var(struct fb_var_screeninfo *var,
 		 var->yres,
 		 var->bits_per_pixel);
 
+	if (!var->pixclock)
+		return -EINVAL;
+
 	ret = lynxfb_set_color_offsets(info);
 
 	if (ret) {

---
base-commit: c369299895a591d96745d6492d4888259b004a9e
change-id: 20260323-fixes-317d7d967fa2

Best regards,
-- 
Junrui Luo <moonafterrain@xxxxxxxxxxx>