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sctp: frag_point sanity check

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If for some reason an association's fragmentation point is zero,
sctp_datamsg_from_user will try to endlessly try to divide a message
into zero-sized chunks. This eventually causes kernel panic due to
running out of memory.

Although this situation is quite unlikely, it has occurred before as
reported. I propose to add this simple last-ditch sanity check due to
the severity of the potential consequences.

Signed-off-by: Jakub Audykowicz <jakub.audykowicz@gmail.com>
Acked-by: Neil Horman <nhorman@tuxdriver.com>
Acked-by: Marcelo Ricardo Leitner <marcelo.leitner@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Jakub Audykowicz
2018-12-04 20:27:41 +01:00
committed by David S. Miller
parent b2b7af8611
commit afd0a8006e
3 changed files with 12 additions and 2 deletions
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5
include/net/sctp/sctp.h
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@@ -620,4 +620,9 @@ static inline bool sctp_transport_pmtu_check(struct sctp_transport *t)
return false;
}
static inline __u32 sctp_min_frag_point(struct sctp_sock *sp, __u16 datasize)
{
return sctp_mtu_payload(sp, SCTP_DEFAULT_MINSEGMENT, datasize);
}
#endif /* __net_sctp_h__ */