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staging: sm750fb: fix division by zero in ps_to_hz()

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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: 81dee67e21 ("staging: sm750fb: add sm750 to staging")
Reported-by: Yuhao Jiang <danisjiang@gmail.com>
Cc: stable@vger.kernel.org
Signed-off-by: Junrui Luo <moonafterrain@outlook.com>
Link: https://patch.msgid.link/SYBPR01MB7881AFBFCE28CCF528B35D0CAF4BA@SYBPR01MB7881.ausprd01.prod.outlook.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Junrui Luo 2026-03-23 15:31:56 +08:00 committed by Greg Kroah-Hartman
parent 2541d18229
commit 75a1621e4f
1 changed files with 3 additions and 0 deletions
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3
drivers/staging/sm750fb/sm750.c
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@ -481,6 +481,9 @@ static int lynxfb_ops_check_var(struct fb_var_screeninfo *var,
struct lynxfb_crtc *crtc;
resource_size_t request;
if (!var->pixclock)
return -EINVAL;
ret = 0;
par = info->par;
crtc = &par->crtc;