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| author |   Chuck Lever <chuck.lever@oracle.com> | 2022-01-31 13:01:53 -0500 |
|---|---|---|
| committer | Chuck Lever <chuck.lever@oracle.com> | 2022-02-09 09:22:48 -0500 |
| commit | e6faac3f58c7c4176b66f63def17a34232a17b0e (patch) | |
| tree | 858960b30b99c269b728075ea860bc8d77abfc81 /fs/nfsd/nfs4proc.c | |
| parent | NFSD: Fix the behavior of READ near OFFSET_MAX (diff) | |
| download | linux-dev-e6faac3f58c7c4176b66f63def17a34232a17b0e.tar.xz linux-dev-e6faac3f58c7c4176b66f63def17a34232a17b0e.zip | |
NFSD: Fix ia_size underflow
iattr::ia_size is a loff_t, which is a signed 64-bit type. NFSv3 and
NFSv4 both define file size as an unsigned 64-bit type. Thus there
is a range of valid file size values an NFS client can send that is
already larger than Linux can handle.
Currently decode_fattr4() dumps a full u64 value into ia_size. If
that value happens to be larger than S64_MAX, then ia_size
underflows. I'm about to fix up the NFSv3 behavior as well, so let's
catch the underflow in the common code path: nfsd_setattr().
Cc: stable@vger.kernel.org
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Diffstat (limited to 'fs/nfsd/nfs4proc.c')
0 files changed, 0 insertions, 0 deletions