sctp: add a ceiling to optlen in some sockopts

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[ Upstream commit 5960cefab9 ]

Hangbin Liu reported that some sockopt calls could cause the kernel to log
a warning on memory allocation failure if the user supplied a large optlen
value. That is because some of them called memdup_user() without a ceiling
on optlen, allowing it to try to allocate really large buffers.

This patch adds a ceiling by limiting optlen to the maximum allowed that
would still make sense for these sockopt.

Reported-by: Hangbin Liu <haliu@redhat.com>
Signed-off-by: Marcelo Ricardo Leitner <marcelo.leitner@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <alexander.levin@verizon.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

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Marcelo Ricardo Leitner 2018-01-08 19:02:28 -02:00 • committed by Greg Kroah-Hartman

parent cd65988121

commit 413e58ac3d

1 changed files with 10 additions and 0 deletions

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net/sctp/socket.c

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