UBI: fix out of bounds write
commit d74adbdb upstream. If aeb->len >= vol->reserved_pebs, we should not be writing aeb into the PEB->LEB mapping. Caught by Coverity, CID #711212. Signed-off-by: Brian Norris <computersforpeace@gmail.com> Signed-off-by: Richard Weinberger <richard@nod.at> Signed-off-by: Jiri Slaby <jslaby@suse.cz>
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