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drm/gma500: Fix end of loop tests for list_for_each_entry

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[ Upstream commit ea9a897b8a ]

The list_for_each_entry() iterator, "connector" in this code, can never be
NULL.  If we exit the loop without finding the correct  connector then
"connector" points invalid memory that is an offset from the list head.
This will eventually lead to memory corruption and presumably a kernel
crash.

Fixes: 9bd81acdb6 ("gma500: Convert Oaktrail to work with new output handling")
Signed-off-by: Harshvardhan Jha <harshvardhan.jha@oracle.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: https://patchwork.freedesktop.org/patch/msgid/20210709073959.11443-1-harshvardhan.jha@oracle.com
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Harshvardhan Jha 2021-07-09 13:09:59 +05:30 committed by Greg Kroah-Hartman
parent 54912723f1
commit 3d58f5e83f
1 changed files with 1 additions and 1 deletions
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2
drivers/gpu/drm/gma500/oaktrail_lvds.c
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@ -117,7 +117,7 @@ static void oaktrail_lvds_mode_set(struct drm_encoder *encoder,
continue;
}
if (!connector) {
if (list_entry_is_head(connector, &mode_config->connector_list, head)) {
DRM_ERROR("Couldn't find connector when setting mode");
gma_power_end(dev);
return;