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sctp: free cmd->obj.chunk for the unprocessed SCTP_CMD_REPLY 

This patch is to fix a memleak caused by no place to free cmd->obj.chunk
for the unprocessed SCTP_CMD_REPLY. This issue occurs when failing to
process a cmd while there're still SCTP_CMD_REPLY cmds on the cmd seq
with an allocated chunk in cmd->obj.chunk.

So fix it by freeing cmd->obj.chunk for each SCTP_CMD_REPLY cmd left on
the cmd seq when any cmd returns error. While at it, also remove 'nomem'
label.

Reported-by: syzbot+107c4aff5f392bf1517f@syzkaller.appspotmail.com
Fixes: 1da177e4c3 ("Linux-2.6.12-rc2")
Signed-off-by: Xin Long <lucien.xin@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Xin Long 2020-01-04 14:15:02 +08:00 committed by David S. Miller
parent a7869e5f91
commit be7a772920
1 changed files with 18 additions and 10 deletions
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28
net/sctp/sm_sideeffect.c
View File

@ -1363,8 +1363,10 @@ static int sctp_cmd_interpreter(enum sctp_event_type event_type,
/* Generate an INIT ACK chunk. */
new_obj = sctp_make_init_ack(asoc, chunk, GFP_ATOMIC,
0);
if (!new_obj)
goto nomem;
if (!new_obj) {
error = -ENOMEM;
break;
}
sctp_add_cmd_sf(commands, SCTP_CMD_REPLY,
SCTP_CHUNK(new_obj));
@ -1386,7 +1388,8 @@ static int sctp_cmd_interpreter(enum sctp_event_type event_type,
if (!new_obj) {
if (cmd->obj.chunk)
sctp_chunk_free(cmd->obj.chunk);
goto nomem;
error = -ENOMEM;
break;
}
sctp_add_cmd_sf(commands, SCTP_CMD_REPLY,
SCTP_CHUNK(new_obj));
@ -1433,8 +1436,10 @@ static int sctp_cmd_interpreter(enum sctp_event_type event_type,
/* Generate a SHUTDOWN chunk. */
new_obj = sctp_make_shutdown(asoc, chunk);
if (!new_obj)
goto nomem;
if (!new_obj) {
error = -ENOMEM;
break;
}
sctp_add_cmd_sf(commands, SCTP_CMD_REPLY,
SCTP_CHUNK(new_obj));
break;
@ -1770,11 +1775,17 @@ static int sctp_cmd_interpreter(enum sctp_event_type event_type,
break;
}
if (error)
if (error) {
cmd = sctp_next_cmd(commands);
while (cmd) {
if (cmd->verb == SCTP_CMD_REPLY)
sctp_chunk_free(cmd->obj.chunk);
cmd = sctp_next_cmd(commands);
}
break;
}
}
out:
/* If this is in response to a received chunk, wait until
* we are done with the packet to open the queue so that we don't
* send multiple packets in response to a single request.
@ -1789,7 +1800,4 @@ out:
sp->data_ready_signalled = 0;
return error;
nomem:
error = -ENOMEM;
goto out;
}