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| author | Al Viro <viro@zeniv.linux.org.uk> | 2015-01-15 17:49:25 +0000 |
|---|---|---|
| committer | Simon Shields <keepcalm444@gmail.com> | 2016-03-15 00:30:36 -0800 |
| commit | b9ff9ff44ca2b2b348a27081c8e0bb686dd094fa (patch) | |
| tree | 10831feedaafed2ed72ec1fc63fa8a7586d696ca /fs/mount.h | |
| parent | b2332d884f24e8b74bf9d7e425e11ef5d02813ae (diff) | |
| download | kernel_samsung_smdk4412-b9ff9ff44ca2b2b348a27081c8e0bb686dd094fa.zip kernel_samsung_smdk4412-b9ff9ff44ca2b2b348a27081c8e0bb686dd094fa.tar.gz kernel_samsung_smdk4412-b9ff9ff44ca2b2b348a27081c8e0bb686dd094fa.tar.bz2 | |
vfs: new internal helper: mnt_has_parent(mnt)
vfsmounts have ->mnt_parent pointing either to a different vfsmount
or to itself; it's never NULL and termination condition in loops
traversing the tree towards root is mnt == mnt->mnt_parent. At least
one place (see the next patch) is confused about what's going on;
let's add an explicit helper checking it right way and use it in
all places where we need it. Not that there had been too many,
but...
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
(cherry picked from commit b2dba1af3c4157040303a76d25216b1713d333d0)
CVE-2014-7970
BugLink: http://bugs.launchpad.net/bugs/1383356
Signed-off-by: Luis Henriques <luis.henriques@canonical.com>
Acked-by: Stefan Bader <stefan.bader@canonical.com>
Acked-by: Andy Whitcroft <apw@canonical.com>
Signed-off-by: Andy Whitcroft <apw@canonical.com>
Change-Id: Iaa5ab510804f3b17fe71197b8919d663a416bf05
Diffstat (limited to 'fs/mount.h')
| -rw-r--r-- | fs/mount.h | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/fs/mount.h b/fs/mount.h new file mode 100644 index 0000000..7890e49 --- /dev/null +++ b/fs/mount.h @@ -0,0 +1,6 @@ +#include <linux/mount.h> + +static inline int mnt_has_parent(struct vfsmount *mnt) +{ + return mnt != mnt->mnt_parent; +} |