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Commit c64c0b3c authored by Eric Dumazet's avatar Eric Dumazet Committed by David S. Miller
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ipv4: provide stronger user input validation in nl_fib_input()



Alexander reported a KMSAN splat caused by reads of uninitialized
field (tb_id_in) from user provided struct fib_result_nl

It turns out nl_fib_input() sanity tests on user input is a bit
wrong :

User can pretend nlh->nlmsg_len is big enough, but provide
at sendmsg() time a too small buffer.

Reported-by: default avatarAlexander Potapenko <glider@google.com>
Signed-off-by: default avatarEric Dumazet <edumazet@google.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 8c290e60
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