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drm/fb_helper: Fix potential NULL pointer dereference

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kcalloc returns NULL on failure. Hence check for the return value
and exit on error to avoid NULL pointer dereference.

Fixes the following smatch errors:
drivers/gpu/drm/drm_fb_helper.c:1271 drm_setup_crtcs() error:
potential null dereference 'modes'.  (kcalloc returns null)
drivers/gpu/drm/drm_fb_helper.c:1272 drm_setup_crtcs() error:
potential null dereference 'crtcs'.  (kcalloc returns null)

Signed-off-by: Sachin Kamat <sachin.kamat@linaro.org>
Signed-off-by: Dave Airlie <airlied@redhat.com>
This commit is contained in:
Sachin Kamat 2012-11-19 09:44:58 +00:00 committed by Dave Airlie
parent e655d122a7
commit 8c5eaca012
1 changed files with 6 additions and 0 deletions
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6
drivers/gpu/drm/drm_fb_helper.c
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@ -1251,6 +1251,11 @@ static void drm_setup_crtcs(struct drm_fb_helper *fb_helper)
sizeof(struct drm_display_mode *), GFP_KERNEL);
enabled = kcalloc(dev->mode_config.num_connector,
sizeof(bool), GFP_KERNEL);
if (!crtcs || !modes || !enabled) {
DRM_ERROR("Memory allocation failed\n");
goto out;
}
drm_enable_connectors(fb_helper, enabled);
@ -1289,6 +1294,7 @@ static void drm_setup_crtcs(struct drm_fb_helper *fb_helper)
}
}
out:
kfree(crtcs);
kfree(modes);
kfree(enabled);