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Subject[PATCH] bounds checking for NFSv3 readdirplus

The NFSv3 readdirplus path doesn't check to see if maxcount is less
than the size of a page before it fills it up, possibly overwriting
random bits of memory. At least, it makes my Solaris NFSv3 client

The attached patch, against 2.5.58, adds this check in a way which is
consistent with the way readdir does under both NFSv2 andNFSv3.



diff -Naur linux-2.5.58-orig/fs/nfsd/nfs3xdr.c linux-2.5.58/fs/nfsd/nfs3xdr.c
--- linux-2.5.58-orig/fs/nfsd/nfs3xdr.c 2003-01-10 09:41:52.000000000 +0000
+++ linux-2.5.58/fs/nfsd/nfs3xdr.c 2003-01-14 19:57:03.000000000 +0000
@@ -578,6 +578,9 @@
args->dircount = ntohl(*p++);
args->count = ntohl(*p++);

+ if (args->count > PAGE_SIZE)
+ args->count = PAGE_SIZE;
args->buffer = page_address(rqstp->rq_respages[rqstp->rq_resused-1]);

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