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drm/nouveau/dispnv04: fix null pointer dereference in nv17_tv_get_hd_modes

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commit 6d411c8ccc 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>
This commit is contained in:
Ma Ke 2024-06-25 16:10:29 +08:00 committed by Greg Kroah-Hartman
parent dbd75f3225
commit 1c9f2e6015
1 changed files with 4 additions and 0 deletions
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4
drivers/gpu/drm/nouveau/dispnv04/tvnv17.c
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@ -259,6 +259,8 @@ 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 {
@ -266,6 +268,8 @@ 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... */