early_res: Need to save the allocation name in drop_range_partial() (dce46a04) · Commits · 戴 / test

During free_early_partial(), reserve_early_without_check() could end extending the early_res area from __check_and_double_early_res(); as a result, the location of the name for the current reservation could change. Therefore, we need to save a local copy of the name. [ hpa: rewrote comment and checkin description ] Signed-off-by:

Yinghai Lu <yinghai@kernel.org> LKML-Reference: <4B8C7C94.7070000@kernel.org> Signed-off-by:

H. Peter Anvin <hpa@zytor.com>

kernel/early_res.c

+12 −2

Original line number	Diff line number	Diff line
		@@ -79,9 +79,19 @@ static void __init drop_range_partial(int i, u64 start, u64 end)
		/* make head segment */
		early_res[i].end = common_start;
		if (old_end > common_end) {
		char name[15];

		/*
		* Save a local copy of the name, since the
		* early_res array could get resized inside
		* reserve_early_without_check() ->
		* __check_and_double_early_res(), which would
		* make the current name pointer invalid.
		*/
		strncpy(name, early_res[i].name,
		sizeof(early_res[i].name) - 1);
		/* add another for left over on tail */
		reserve_early_without_check(common_end, old_end,
		early_res[i].name);
		reserve_early_without_check(common_end, old_end, name);
		}
		return;
		} else {

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