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| author | Ma Ke <make24@iscas.ac.cn> | 2024-06-25 11:10:29 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2024-07-05 10:34:03 +0300 |
| commit | 7ece609b0ce7a7ea8acdf512a77d1fee26621637 (patch) | |
| tree | 5a81be29016d7c1c6536a44ec59b435e872da445 /drivers/gpu/drm/nouveau | |
| parent | 06dec31a0a5112a91f49085e8a8fa1a82296d5c7 (diff) | |
| download | linux-7ece609b0ce7a7ea8acdf512a77d1fee26621637.tar.xz | |
drm/nouveau/dispnv04: fix null pointer dereference in nv17_tv_get_hd_modes
commit 6d411c8ccc0137a612e0044489030a194ff5c843 upstream.
In nv17_tv_get_hd_modes(), the return value of drm_mode_duplicate() is
assigned to mode, which will lead to a possible NULL pointer dereference
on failure of drm_mode_duplicate(). The same applies to drm_cvt_mode().
Add a check to avoid null pointer dereference.
Cc: stable@vger.kernel.org
Signed-off-by: Ma Ke <make24@iscas.ac.cn>
Signed-off-by: Lyude Paul <lyude@redhat.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20240625081029.2619437-1-make24@iscas.ac.cn
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/gpu/drm/nouveau')
| -rw-r--r-- | drivers/gpu/drm/nouveau/dispnv04/tvnv17.c | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/drivers/gpu/drm/nouveau/dispnv04/tvnv17.c b/drivers/gpu/drm/nouveau/dispnv04/tvnv17.c index 4a08e61f3336..2033214c4b78 100644 --- a/drivers/gpu/drm/nouveau/dispnv04/tvnv17.c +++ b/drivers/gpu/drm/nouveau/dispnv04/tvnv17.c @@ -260,6 +260,8 @@ static int nv17_tv_get_hd_modes(struct drm_encoder *encoder, if (modes[i].hdisplay == output_mode->hdisplay && modes[i].vdisplay == output_mode->vdisplay) { mode = drm_mode_duplicate(encoder->dev, output_mode); + if (!mode) + continue; mode->type |= DRM_MODE_TYPE_PREFERRED; } else { @@ -267,6 +269,8 @@ static int nv17_tv_get_hd_modes(struct drm_encoder *encoder, modes[i].vdisplay, 60, false, (output_mode->flags & DRM_MODE_FLAG_INTERLACE), false); + if (!mode) + continue; } /* CVT modes are sometimes unsuitable... */ |