diff options
| author | Shixiong Ou <oushixiong@kylinos.cn> | 2026-07-30 09:44:40 +0800 |
|---|---|---|
| committer | Jocelyn Falempe <jfalempe@redhat.com> | 2026-08-13 15:46:50 +0200 |
| commit | 921ac6cb066d09b5765db892d0db0ffaffa98767 (patch) | |
| tree | d56f07497add580e01213d568e38eb57ea0f7051 /drivers/gpu | |
| parent | 6c916e301fa10de9158b922474ade7b43d726cda (diff) | |
drm/log: Fix division by zero when scale module parameter is 0
The scale module parameter can be set to 0 via kernel command line.
When scale is 0, scaled_font_h and scaled_font_w become 0, causing
a division by zero in the rows/columns calculation.
Since the scale module parameter is read-only (0444 permissions), it
cannot be changed at runtime via sysfs. Clamp it to 1 once in
drm_log_register().
Fixes: 8a4b913df427 ("drm/log: Add integer scaling support")
Signed-off-by: Shixiong Ou <oushixiong@kylinos.cn>
Reviewed-by: Jocelyn Falempe <jfalempe@redhat.com>
Link: https://patch.msgid.link/20260730014440.66323-1-oushixiong1025@163.com
Signed-off-by: Jocelyn Falempe <jfalempe@redhat.com>
Diffstat (limited to 'drivers/gpu')
| -rw-r--r-- | drivers/gpu/drm/clients/drm_log.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/drivers/gpu/drm/clients/drm_log.c b/drivers/gpu/drm/clients/drm_log.c index 8d21b785bead..a3259b8f2333 100644 --- a/drivers/gpu/drm/clients/drm_log.c +++ b/drivers/gpu/drm/clients/drm_log.c @@ -419,6 +419,9 @@ void drm_log_register(struct drm_device *dev) { struct drm_log *new; + if (!scale) + scale = 1; + new = kzalloc_obj(*new); if (!new) goto err_warn; |