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| author | Chuck Lever <chuck.lever@oracle.com> | 2017-08-18 17:12:19 +0200 |
|---|---|---|
| committer | J. Bruce Fields <bfields@redhat.com> | 2017-08-25 00:05:30 +0200 |
| commit | fc788f64f1f3eb31e87d4f53bcf1ab76590d5838 (patch) | |
| tree | c376a2d770711851ea97fdc6bf62a867986c0a4b /fs/mpage.c | |
| parent | nfsd: Fix a memory scribble in the callback channel (diff) | |
| download | linux-fc788f64f1f3eb31e87d4f53bcf1ab76590d5838.tar.xz linux-fc788f64f1f3eb31e87d4f53bcf1ab76590d5838.zip | |
nfsd: Limit end of page list when decoding NFSv4 WRITE
When processing an NFSv4 WRITE operation, argp->end should never
point past the end of the data in the final page of the page list.
Otherwise, nfsd4_decode_compound can walk into uninitialized memory.
More critical, nfsd4_decode_write is failing to increment argp->pagelen
when it increments argp->pagelist. This can cause later xdr decoders
to assume more data is available than really is, which can cause server
crashes on malformed requests.
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Cc: stable@vger.kernel.org
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
Diffstat (limited to 'fs/mpage.c')
0 files changed, 0 insertions, 0 deletions