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net: sctp: Fix IPv6 ancestor_size calc in sctp_copy_descendant

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When calculating ancestor_size with IPv6 enabled, simply using
sizeof(struct ipv6_pinfo) doesn't account for extra bytes needed for
alignment in the struct sctp6_sock. On x86, there aren't any extra
bytes, but on ARM the ipv6_pinfo structure is aligned on an 8-byte
boundary so there were 4 pad bytes that were omitted from the
ancestor_size calculation.  This would lead to corruption of the
pd_lobby pointers, causing an oops when trying to free the sctp
structure on socket close.

Fixes: 636d25d557 ("sctp: not copy sctp_sock pd_lobby in sctp_copy_descendant")
Signed-off-by: Henry Ptasinski <hptasinski@google.com>
Acked-by: Marcelo Ricardo Leitner <marcelo.leitner@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Henry Ptasinski 2020-09-19 00:12:11 +00:00 • committed by David S. Miller
parent b6e11785cf
commit fe81d9f618
2 changed files with 8 additions and 9 deletions
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8
include/net/sctp/structs.h
View file

@ -226,12 +226,14 @@ struct sctp_sock {
data_ready_signalled:1;
atomic_t pd_mode;
/* Fields after this point will be skipped on copies, like on accept
* and peeloff operations
*/
/* Receive to here while partial delivery is in effect. */
struct sk_buff_head pd_lobby;
/* These must be the last fields, as they will skipped on copies,
* like on accept and peeloff operations
*/
struct list_head auto_asconf_list;
int do_auto_asconf;
};