locks: only validate the lock vs. f_mode in F_SETLK codepaths

v2: replace missing break in switch statement (as pointed out by Dave
    Jones)

commit bce7560d4946 (locks: consolidate checks for compatible
filp->f_mode values in setlk handlers) introduced a regression in the
F_GETLK handler.

flock64_to_posix_lock is a shared codepath between F_GETLK and F_SETLK,
but the f_mode checks should only be applicable to the F_SETLK codepaths
according to POSIX.

Instead of just reverting the patch, add a new function to do this
checking and have the F_SETLK handlers call it.

Cc: Dave Jones <davej@redhat.com>
Reported-and-Tested-by: Reuben Farrelly <reuben@reub.net>
Signed-off-by: Jeff Layton <jlayton@poochiereds.net>

diff --git a/fs/locks.c b/fs/locks.c
index e663aea..e390bd9 100644 (file)
--- a/fs/locks.c
+++ b/fs/locks.c
@@ -389,18 +389,6 @@ static int flock64_to_posix_lock(struct file *filp, struct file_lock *fl,
        fl->fl_ops = NULL;
        fl->fl_lmops = NULL;
 
-       /* Ensure that fl->fl_filp has compatible f_mode */
-       switch (l->l_type) {
-       case F_RDLCK:
-               if (!(filp->f_mode & FMODE_READ))
-                       return -EBADF;
-               break;
-       case F_WRLCK:
-               if (!(filp->f_mode & FMODE_WRITE))
-                       return -EBADF;
-               break;
-       }
-
        return assign_type(fl, l->l_type);
 }
 
@@ -2034,6 +2022,22 @@ static int do_lock_file_wait(struct file *filp, unsigned int cmd,
        return error;
 }
 
+/* Ensure that fl->fl_filp has compatible f_mode for F_SETLK calls */
+static int
+check_fmode_for_setlk(struct file_lock *fl)
+{
+       switch (fl->fl_type) {
+       case F_RDLCK:
+               if (!(fl->fl_file->f_mode & FMODE_READ))
+                       return -EBADF;
+               break;
+       case F_WRLCK:
+               if (!(fl->fl_file->f_mode & FMODE_WRITE))
+                       return -EBADF;
+       }
+       return 0;
+}
+
 /* Apply the lock described by l to an open file descriptor.
  * This implements both the F_SETLK and F_SETLKW commands of fcntl().
  */
@@ -2071,6 +2075,10 @@ again:
        if (error)
                goto out;
 
+       error = check_fmode_for_setlk(file_lock);
+       if (error)
+               goto out;
+
        /*
         * If the cmd is requesting file-private locks, then set the
         * FL_OFDLCK flag and override the owner.
@@ -2206,6 +2214,10 @@ again:
        if (error)
                goto out;
 
+       error = check_fmode_for_setlk(file_lock);
+       if (error)
+               goto out;
+
        /*
         * If the cmd is requesting file-private locks, then set the
         * FL_OFDLCK flag and override the owner.