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authorJeff Mahoney <jeffm@suse.com>2017-02-06 19:39:09 -0500
committerDavid Sterba <dsterba@suse.com>2017-02-08 17:47:30 +0100
commit2a362249187a8d0f6d942d6e1d763d150a296f47 (patch)
treea82a639c63ee3a78259c9ee909d19c2c48d9d3d3 /fs
parent57b59ed2e5b91e958843609c7884794e29e6c4cb (diff)
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btrfs: fix btrfs_compat_ioctl failures on non-compat ioctls
Commit 4c63c2454ef incorrectly assumed that returning -ENOIOCTLCMD would cause the native ioctl to be called. The ->compat_ioctl callback is expected to handle all ioctls, not just compat variants. As a result, when using 32-bit userspace on 64-bit kernels, everything except those three ioctls would return -ENOTTY. Fixes: 4c63c2454ef ("btrfs: bugfix: handle FS_IOC32_{GETFLAGS,SETFLAGS,GETVERSION} in btrfs_ioctl") Cc: stable@vger.kernel.org Signed-off-by: Jeff Mahoney <jeffm@suse.com> Reviewed-by: David Sterba <dsterba@suse.com> Signed-off-by: David Sterba <dsterba@suse.com>
Diffstat (limited to 'fs')
-rw-r--r--fs/btrfs/ioctl.c6
1 files changed, 4 insertions, 2 deletions
diff --git a/fs/btrfs/ioctl.c b/fs/btrfs/ioctl.c
index 0a6902555e65..0c77cad89e87 100644
--- a/fs/btrfs/ioctl.c
+++ b/fs/btrfs/ioctl.c
@@ -5665,6 +5665,10 @@ long btrfs_ioctl(struct file *file, unsigned int
#ifdef CONFIG_COMPAT
long btrfs_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
{
+ /*
+ * These all access 32-bit values anyway so no further
+ * handling is necessary.
+ */
switch (cmd) {
case FS_IOC32_GETFLAGS:
cmd = FS_IOC_GETFLAGS;
@@ -5675,8 +5679,6 @@ long btrfs_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
case FS_IOC32_GETVERSION:
cmd = FS_IOC_GETVERSION;
break;
- default:
- return -ENOIOCTLCMD;
}
return btrfs_ioctl(file, cmd, (unsigned long) compat_ptr(arg));