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net/9p: Return error on read with NULL buffer

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This patch ensures that a read(fd, NULL, 10) returns  EFAULT on a 9p file.

Signed-off-by: Sanchit Garg <sancgarg@linux.vnet.ibm.com>
Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Signed-off-by: Eric Van Hensbergen <ericvh@gmail.com>
This commit is contained in:
Sanchit Garg 2010-10-27 09:41:01 +05:30 committed by Eric Van Hensbergen
parent b165d60145
commit f6ac55b6c1
1 changed files with 1 additions and 4 deletions
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5
net/9p/client.c
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@ -1286,16 +1286,13 @@ p9_client_read(struct p9_fid *fid, char *data, char __user *udata, u64 offset,
if (data) { if (data) {
memmove(data, dataptr, count); memmove(data, dataptr, count);
} } else {
if (udata) {
err = copy_to_user(udata, dataptr, count); err = copy_to_user(udata, dataptr, count);
if (err) { if (err) {
err = -EFAULT; err = -EFAULT;
goto free_and_error; goto free_and_error;
} }
} }
p9_free_req(clnt, req); p9_free_req(clnt, req);
return count; return count;