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authorAbhishek Kulkarni <adkulkar@umail.iu.edu>2009-08-18 01:38:45 +0400
committerEric Van Hensbergen <ericvh@gmail.com>2009-08-18 01:39:54 +0400
commit0aad37ef3deed118d3816e1d1a600eb2ec9dcb87 (patch)
treecbcfe9f449f57cd35d0ce262e5287da4f8476f30
parent48559b4c30708ebdc849483da9fb83ee08c6c908 (diff)
downloadlinux-0aad37ef3deed118d3816e1d1a600eb2ec9dcb87.tar.xz
net/9p: insulate the client against an invalid error code sent by a 9p server
A looney tunes server sending an invalid error code (which is !IS_ERR_VALUE) can result in a client oops. So fix it by adding a check and converting unknown or invalid error codes to -ESERVERFAULT. Signed-off-by: Abhishek Kulkarni <adkulkar@umail.iu.edu> Signed-off-by: Eric Van Hensbergen <ericvh@gmail.com>
-rw-r--r--net/9p/client.c7
-rw-r--r--net/9p/error.c2
2 files changed, 2 insertions, 7 deletions
diff --git a/net/9p/client.c b/net/9p/client.c
index 7bbd2d5ae8d3..5bf5f227dbe0 100644
--- a/net/9p/client.c
+++ b/net/9p/client.c
@@ -411,14 +411,9 @@ static int p9_check_errors(struct p9_client *c, struct p9_req_t *req)
if (c->dotu)
err = -ecode;
- if (!err) {
+ if (!err || !IS_ERR_VALUE(err))
err = p9_errstr2errno(ename, strlen(ename));
- /* string match failed */
- if (!err)
- err = -ESERVERFAULT;
- }
-
P9_DPRINTK(P9_DEBUG_9P, "<<< RERROR (%d) %s\n", -ecode, ename);
kfree(ename);
diff --git a/net/9p/error.c b/net/9p/error.c
index fdebe4314062..52518512a93e 100644
--- a/net/9p/error.c
+++ b/net/9p/error.c
@@ -239,7 +239,7 @@ int p9_errstr2errno(char *errstr, int len)
errstr[len] = 0;
printk(KERN_ERR "%s: server reported unknown error %s\n",
__func__, errstr);
- errno = 1;
+ errno = ESERVERFAULT;
}
return -errno;