diff options
| author | Shixiong Ou <oushixiong@kylinos.cn> | 2026-07-29 16:48:15 +0800 |
|---|---|---|
| committer | Jocelyn Falempe <jfalempe@redhat.com> | 2026-08-13 15:49:40 +0200 |
| commit | f4f2bba28df9b9aaa00262a462139dbbcdc38d9f (patch) | |
| tree | d20e3bd7c46cd02a28ace2e2281502d53484725b /drivers/gpu/drm | |
| parent | 60baa179ed1333535f6e2da4133511db55278ee4 (diff) | |
drm/log: Fix infinite loop when scale is too large for display
When scale is large enough that scaled_font exceeds the display
dimensions, rows or columns become 0. A columns value of 0 causes
an infinite loop in drm_log_draw_kmsg_record() because the loop
never decrements len.
Check for zero rows/columns in drm_log_setup_modeset() and return
an error, cleaning up the already allocated buffer to avoid a leak.
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/20260729084815.692944-1-oushixiong1025@163.com
Signed-off-by: Jocelyn Falempe <jfalempe@redhat.com>
Diffstat (limited to 'drivers/gpu/drm')
| -rw-r--r-- | drivers/gpu/drm/clients/drm_log.c | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/drivers/gpu/drm/clients/drm_log.c b/drivers/gpu/drm/clients/drm_log.c index f23a92f826c9..467cdce57dd3 100644 --- a/drivers/gpu/drm/clients/drm_log.c +++ b/drivers/gpu/drm/clients/drm_log.c @@ -218,6 +218,12 @@ static int drm_log_setup_modeset(struct drm_client_dev *client, scanout->scaled_font_w = scanout->font->width * scale; scanout->rows = height / scanout->scaled_font_h; scanout->columns = width / scanout->scaled_font_w; + if (!scanout->rows || !scanout->columns) { + drm_client_buffer_delete(scanout->buffer); + scanout->buffer = NULL; + mode_set->fb = NULL; + return -EINVAL; + } scanout->front_color = drm_draw_color_from_xrgb8888(0xffffff, format); scanout->prefix_color = drm_draw_color_from_xrgb8888(0x4e9a06, format); return 0; |