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| author | J. Bruce Fields <bfields@fieldses.org> | 2012-07-23 15:17:17 -0400 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2012-08-09 08:31:29 -0700 |
| commit | fd3cca0a4e6ac0512e9122f59dfe0214b74049fb (patch) | |
| tree | a8d354f5602a097d4c4b585b0dec93558a9b9547 /fs | |
| parent | 7b689c5d930f281e417597af9f817ba03dc9d898 (diff) | |
| download | linux-3.10-fd3cca0a4e6ac0512e9122f59dfe0214b74049fb.tar.gz linux-3.10-fd3cca0a4e6ac0512e9122f59dfe0214b74049fb.tar.bz2 linux-3.10-fd3cca0a4e6ac0512e9122f59dfe0214b74049fb.zip | |
locks: fix checking of fcntl_setlease argument
commit 0ec4f431eb56d633da3a55da67d5c4b88886ccc7 upstream.
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. ]
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'fs')
| -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 6a64f154db0..fcc50ab71cc 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; |