Marko Zec
4ab122e8ef
When calling dxr_init(), the FIB_ALGO infrastructure may provide a pointer to a previous dxr instance, which permits reuse of auxiliary dxr structures, i.e. incremental lookup structure updates. For dxr this is a crucial feature provided by FIB_ALGO, since dxr incremental updates are typically several orders of magnitude faster than full lookup table rebuilds. However, the auxiliary dxr structure caches a pointer to struct fib_data and relies upon it for performing incremental updates. Apparently, incremental rebuild requests from FIB_ALGO, i.e. a calls to dxr_init() with a pointer old_data set, may (under not yet fully understood circumstances) be invoked within a different fib_data context than the one cached in the previous version of dxr auxiliary structures. In such (rare) events, we ignore the offered old dxr context, and proceed with a full lookup structure rebuild instead of attempting an incremental one using a fib_data context which may or may not no longer be valid, and thus lead to a system crash. PR: 278422 MFC after: 1 week
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