Wind River Support Network

Description

In the Linux kernel, the following vulnerability has been resolved:[EOL][EOL]ring-buffer: Do not warn in ring_buffer_map_get_reader() when reader catches up[EOL][EOL]The function ring_buffer_map_get_reader() is a bit more strict than the[EOL]other get reader functions, and except for certain situations the[EOL]rb_get_reader_page() should not return NULL. If it does, it triggers a[EOL]warning.[EOL][EOL]This warning was triggering but after looking at why, it was because[EOL]another acceptable situation was happening and it wasn't checked for.[EOL][EOL]If the reader catches up to the writer and there's still data to be read[EOL]on the reader page, then the rb_get_reader_page() will return NULL as[EOL]there's no new page to get.[EOL][EOL]In this situation, the reader page should not be updated and no warning[EOL]should trigger.