ipv4: provide stronger user input validation in nl_fib_input()

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[ Upstream commit c64c0b3cac ]

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: Alexander Potapenko <glider@google.com>
Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

...

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Eric Dumazet 2017-03-21 19:22:28 -07:00 • committed by Greg Kroah-Hartman

parent 2f94dd54cf

commit 62e85fe590

1 changed files with 2 additions and 1 deletions

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net/ipv4/fib_frontend.c

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