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9p: cope with bogus responses from server in p9_client_{read,write}

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if server claims to have written/read more than we'd told it to,
warn and cap the claimed byte count to avoid advancing more than
we are ready to.
This commit is contained in:
Al Viro 2015-07-04 16:17:39 -04:00
parent 67e808fbb0
commit 0f1db7dee2
1 changed files with 8 additions and 0 deletions
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8
net/9p/client.c
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@ -1583,6 +1583,10 @@ p9_client_read(struct p9_fid *fid, u64 offset, struct iov_iter *to, int *err)
p9_free_req(clnt, req);
break;
}
if (rsize < count) {
pr_err("bogus RREAD count (%d > %d)\n", count, rsize);
count = rsize;
}
p9_debug(P9_DEBUG_9P, "<<< RREAD count %d\n", count);
if (!count) {
@ -1650,6 +1654,10 @@ p9_client_write(struct p9_fid *fid, u64 offset, struct iov_iter *from, int *err)
p9_free_req(clnt, req);
break;
}
if (rsize < count) {
pr_err("bogus RWRITE count (%d > %d)\n", count, rsize);
count = rsize;
}
p9_debug(P9_DEBUG_9P, "<<< RWRITE count %d\n", count);