diff options
| author | J. Bruce Fields <bfields@fieldses.org> | 2012-07-23 15:17:17 -0400 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2012-07-23 12:46:01 -0700 |
| commit | 0ec4f431eb56d633da3a55da67d5c4b88886ccc7 (patch) | |
| tree | 7a782163f6598510ae57b0523c2e625a8b26f2ce /fs/locks.c | |
| parent | a66d2c8f7ec1284206ca7c14569e2a607583f1e3 (diff) | |
| download | lwn-0ec4f431eb56d633da3a55da67d5c4b88886ccc7.tar.gz lwn-0ec4f431eb56d633da3a55da67d5c4b88886ccc7.zip | |
locks: fix checking of fcntl_setlease argument
The only checks of the long argument passed to fcntl(fd,F_SETLEASE,.)
are done after converting the long to an int. Thus some illegal values
may be let through and cause problems in later code.
[ They actually *don't* cause problems in mainline, as of Dave Jones's
commit 8d657eb3b438 "Remove easily user-triggerable BUG from
generic_setlease", but we should fix this anyway. And this patch will
be necessary to fix real bugs on earlier kernels. ]
Cc: stable@vger.kernel.org
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'fs/locks.c')
| -rw-r--r-- | fs/locks.c | 6 |
1 files changed, 3 insertions, 3 deletions
diff --git a/fs/locks.c b/fs/locks.c index fce6238d52c1..82c353304f9e 100644 --- a/fs/locks.c +++ b/fs/locks.c @@ -308,7 +308,7 @@ static int flock_make_lock(struct file *filp, struct file_lock **lock, return 0; } -static int assign_type(struct file_lock *fl, int type) +static int assign_type(struct file_lock *fl, long type) { switch (type) { case F_RDLCK: @@ -445,7 +445,7 @@ static const struct lock_manager_operations lease_manager_ops = { /* * Initialize a lease, use the default lock manager operations */ -static int lease_init(struct file *filp, int type, struct file_lock *fl) +static int lease_init(struct file *filp, long type, struct file_lock *fl) { if (assign_type(fl, type) != 0) return -EINVAL; @@ -463,7 +463,7 @@ static int lease_init(struct file *filp, int type, struct file_lock *fl) } /* Allocate a file_lock initialised to this type of lease */ -static struct file_lock *lease_alloc(struct file *filp, int type) +static struct file_lock *lease_alloc(struct file *filp, long type) { struct file_lock *fl = locks_alloc_lock(); int error = -ENOMEM; |