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| author |   Randy Dunlap <rdunlap@infradead.org> | 2021-03-01 16:19:30 -0800 |
|---|---|---|
| committer |   Trond Myklebust <trond.myklebust@hammerspace.com> | 2021-04-05 09:04:20 -0400 |
| commit | c09f11ef35955785f92369e25819bf0629df2e59 (patch) | |
| tree | db4dd00b82d079280c7e335d688337cdfdf3003c /fs/nfs/client.c | |
| parent | NFS: Only change the cookie verifier if the directory page cache is empty (diff) | |
| download | linux-dev-c09f11ef35955785f92369e25819bf0629df2e59.tar.xz linux-dev-c09f11ef35955785f92369e25819bf0629df2e59.zip | |
NFS: fs_context: validate UDP retrans to prevent shift out-of-bounds
Fix shift out-of-bounds in xprt_calc_majortimeo(). This is caused
by a garbage timeout (retrans) mount option being passed to nfs mount,
in this case from syzkaller.
If the protocol is XPRT_TRANSPORT_UDP, then 'retrans' is a shift
value for a 64-bit long integer, so 'retrans' cannot be >= 64.
If it is >= 64, fail the mount and return an error.
Fixes: 9954bf92c0cd ("NFS: Move mount parameterisation bits into their own file")
Reported-by: syzbot+ba2e91df8f74809417fa@syzkaller.appspotmail.com
Reported-by: syzbot+f3a0fa110fd630ab56c8@syzkaller.appspotmail.com
Signed-off-by: Randy Dunlap <rdunlap@infradead.org>
Cc: Trond Myklebust <trond.myklebust@hammerspace.com>
Cc: Anna Schumaker <anna.schumaker@netapp.com>
Cc: linux-nfs@vger.kernel.org
Cc: David Howells <dhowells@redhat.com>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: stable@vger.kernel.org
Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
Diffstat (limited to 'fs/nfs/client.c')
0 files changed, 0 insertions, 0 deletions