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| author | Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp> | 2018-04-10 15:15:16 +0900 |
|---|---|---|
| committer | Eric W. Biederman <ebiederm@xmission.com> | 2018-04-10 19:17:41 -0500 |
| commit | 1f5781725dcbb026438e77091c91a94f678c3522 (patch) | |
| tree | 5456dfa335758721c9e312c9f910f10989aeb573 /security | |
| parent | 2236d4d39035b9839944603ec4b65ce71180a9ea (diff) | |
| download | lwn-1f5781725dcbb026438e77091c91a94f678c3522.tar.gz lwn-1f5781725dcbb026438e77091c91a94f678c3522.zip | |
commoncap: Handle memory allocation failure.
syzbot is reporting NULL pointer dereference at xattr_getsecurity() [1],
for cap_inode_getsecurity() is returning sizeof(struct vfs_cap_data) when
memory allocation failed. Return -ENOMEM if memory allocation failed.
[1] https://syzkaller.appspot.com/bug?id=a55ba438506fe68649a5f50d2d82d56b365e0107
Signed-off-by: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
Fixes: 8db6c34f1dbc8e06 ("Introduce v3 namespaced file capabilities")
Reported-by: syzbot <syzbot+9369930ca44f29e60e2d@syzkaller.appspotmail.com>
Cc: stable <stable@vger.kernel.org> # 4.14+
Acked-by: Serge E. Hallyn <serge@hallyn.com>
Acked-by: James Morris <james.morris@microsoft.com>
Signed-off-by: Eric W. Biederman <ebiederm@xmission.com>
Diffstat (limited to 'security')
| -rw-r--r-- | security/commoncap.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/security/commoncap.c b/security/commoncap.c index 48620c93d697..1ce701fcb3f3 100644 --- a/security/commoncap.c +++ b/security/commoncap.c @@ -449,6 +449,8 @@ int cap_inode_getsecurity(struct inode *inode, const char *name, void **buffer, magic |= VFS_CAP_FLAGS_EFFECTIVE; memcpy(&cap->data, &nscap->data, sizeof(__le32) * 2 * VFS_CAP_U32); cap->magic_etc = cpu_to_le32(magic); + } else { + size = -ENOMEM; } } kfree(tmpbuf); |