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| author | Christoph Jaeger <christophjaeger@linux.com> | 2014-04-12 13:33:13 +0200 |
|---|---|---|
| committer | Chris Mason <clm@fb.com> | 2014-04-14 11:31:08 -0700 |
| commit | 0040e606e35a0db80fc3fac04ccc7c7176a8e2b1 (patch) | |
| tree | 42978de09e95365ba46df73587b3a30149566247 | |
| parent | e4fbaee29272533a242f117d18712e2974520d2c (diff) | |
| download | linux-0040e606e35a0db80fc3fac04ccc7c7176a8e2b1.tar.gz linux-0040e606e35a0db80fc3fac04ccc7c7176a8e2b1.tar.bz2 linux-0040e606e35a0db80fc3fac04ccc7c7176a8e2b1.zip | |
btrfs: fix use-after-free in mount_subvol()
Pointer 'newargs' is used after the memory that it points to has already
been freed.
Picked up by Coverity - CID 1201425.
Fixes: 0723a0473f ("btrfs: allow mounting btrfs subvolumes with
different ro/rw options")
Signed-off-by: Christoph Jaeger <christophjaeger@linux.com>
Signed-off-by: Chris Mason <clm@fb.com>
| -rw-r--r-- | fs/btrfs/super.c | 8 |
1 files changed, 6 insertions, 2 deletions
diff --git a/fs/btrfs/super.c b/fs/btrfs/super.c index 994c40955315..53bc3733d483 100644 --- a/fs/btrfs/super.c +++ b/fs/btrfs/super.c @@ -1186,7 +1186,6 @@ static struct dentry *mount_subvol(const char *subvol_name, int flags, return ERR_PTR(-ENOMEM); mnt = vfs_kern_mount(&btrfs_fs_type, flags, device_name, newargs); - kfree(newargs); if (PTR_RET(mnt) == -EBUSY) { if (flags & MS_RDONLY) { @@ -1196,17 +1195,22 @@ static struct dentry *mount_subvol(const char *subvol_name, int flags, int r; mnt = vfs_kern_mount(&btrfs_fs_type, flags | MS_RDONLY, device_name, newargs); - if (IS_ERR(mnt)) + if (IS_ERR(mnt)) { + kfree(newargs); return ERR_CAST(mnt); + } r = btrfs_remount(mnt->mnt_sb, &flags, NULL); if (r < 0) { /* FIXME: release vfsmount mnt ??*/ + kfree(newargs); return ERR_PTR(r); } } } + kfree(newargs); + if (IS_ERR(mnt)) return ERR_CAST(mnt); |