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* [PATCH] sctp: Fix COMM_LOST/CANT_STR_ASSOC err reporting on big-endian platforms
@ 2020-10-30 13:26 Petr Malat
  2020-11-02 13:27 ` Marcelo Ricardo Leitner
  0 siblings, 1 reply; 3+ messages in thread
From: Petr Malat @ 2020-10-30 13:26 UTC (permalink / raw)
  To: linux-sctp
  Cc: Petr Malat, Vlad Yasevich, Neil Horman, Marcelo Ricardo Leitner,
	David S. Miller, Jakub Kicinski, netdev, linux-kernel

Commit 978aa0474115 ("sctp: fix some type cast warnings introduced since
very beginning")' broke err reading from sctp_arg, because it reads the
value as 32-bit integer, although the value is stored as 16-bit integer.
Later this value is passed to the userspace in 16-bit variable, thus the
user always gets 0 on big-endian platforms. Fix it by reading the __u16
field of sctp_arg union, as reading err field would produce a sparse

Signed-off-by: Petr Malat <>
 net/sctp/sm_sideeffect.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/net/sctp/sm_sideeffect.c b/net/sctp/sm_sideeffect.c
index aa821e71f05e..813d30767204 100644
--- a/net/sctp/sm_sideeffect.c
+++ b/net/sctp/sm_sideeffect.c
@@ -1601,12 +1601,12 @@ static int sctp_cmd_interpreter(enum sctp_event_type event_type,
-			sctp_cmd_init_failed(commands, asoc, cmd->obj.u32);
+			sctp_cmd_init_failed(commands, asoc, cmd->obj.u16);
 			sctp_cmd_assoc_failed(commands, asoc, event_type,
-					      subtype, chunk, cmd->obj.u32);
+					      subtype, chunk, cmd->obj.u16);

^ permalink raw reply related	[flat|nested] 3+ messages in thread

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2020-10-30 13:26 [PATCH] sctp: Fix COMM_LOST/CANT_STR_ASSOC err reporting on big-endian platforms Petr Malat
2020-11-02 13:27 ` Marcelo Ricardo Leitner
2020-11-02 23:05   ` Jakub Kicinski

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