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drm/log: Fix division by zero when scale module parameter is 0

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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: 8a4b913df4 ("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>
This commit is contained in:
Shixiong Ou
2026-07-30 09:44:40 +08:00
committed by Jocelyn Falempe
parent 6c916e301f
commit 921ac6cb06
1 changed files with 3 additions and 0 deletions
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3
drivers/gpu/drm/clients/drm_log.c
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@@ -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;