Kernel/linux
1
0
Fork 0
mirror of https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git synced 2024-12-28 00:33:16 +00:00
Code Issues Actions Packages Projects Releases Wiki Activity

net/smc: check return value of sock_recvmsg when draining clc data

Browse Source 
When receiving clc msg, the field length in smc_clc_msg_hdr indicates the
length of msg should be received from network and the value should not be
fully trusted as it is from the network. Once the value of length exceeds
the value of buflen in function smc_clc_wait_msg it may run into deadloop
when trying to drain the remaining data exceeding buflen.

This patch checks the return value of sock_recvmsg when draining data in
case of deadloop in draining.

Fixes: fb4f79264c ("net/smc: tolerate future SMCD versions")
Signed-off-by: Guangguan Wang <guangguan.wang@linux.alibaba.com>
Reviewed-by: Wen Gu <guwen@linux.alibaba.com>
Reviewed-by: D. Wythe <alibuda@linux.alibaba.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Guangguan Wang 2024-12-11 17:21:21 +08:00 committed by David S. Miller
parent 9ab332deb6
commit c5b8ee5022
1 changed files with 5 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

5
net/smc/smc_clc.c
View File

@ -774,6 +774,11 @@ int smc_clc_wait_msg(struct smc_sock *smc, void *buf, int buflen,
SMC_CLC_RECV_BUF_LEN : datlen;
iov_iter_kvec(&msg.msg_iter, ITER_DEST, &vec, 1, recvlen);
len = sock_recvmsg(smc->clcsock, &msg, krflags);
if (len < recvlen) {
smc->sk.sk_err = EPROTO;
reason_code = -EPROTO;
goto out;
}
datlen -= len;
}
if (clcm->type == SMC_CLC_DECLINE) {