unimore/kernel-hacking-2024-linux-steffo
unimore/kernel-hacking-2024-linux-steffo
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svcrpc: don't error out on small tcp fragment

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Though clients we care about mostly don't do this, it is possible for
rpc requests to be sent in multiple fragments.  Here we have a sanity
check to ensure that the final received rpc isn't too small--except that
the number we're actually checking is the length of just the final
fragment, not of the whole rpc.  So a perfectly legal rpc that's
unluckily fragmented could cause the server to close the connection
here.

Cc: stable@vger.kernel.org
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
This commit is contained in:
J. Bruce Fields 2013-06-26 10:55:40 -04:00
parent cf3aa02cb4
commit 1f691b07c5
1 changed files with 1 additions and 1 deletions
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2
net/sunrpc/svcsock.c
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@ -1095,7 +1095,7 @@ static int svc_tcp_recvfrom(struct svc_rqst *rqstp)
goto err_noclose;
}
if (svc_sock_reclen(svsk) < 8) {
if (svsk->sk_datalen < 8) {
svsk->sk_datalen = 0;
goto err_delete; /* client is nuts. */
}