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authorAruna Balakrishnaiah <aruna@linux.vnet.ibm.com>2013-06-25 14:33:56 +0530
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2015-02-05 22:35:39 -0800
commit841eb01f53cdb78d840dc4000f103fa7dd4228d2 (patch)
tree27a0d08baa988077b04f13c4b8a66be81ebe9296
parentb12835bdb935057b69b0b9059226f554a926415e (diff)
downloadlinux-linaro-stable-841eb01f53cdb78d840dc4000f103fa7dd4228d2.tar.gz
pstore: Fail to unlink if a driver has not defined pstore_erase
commit bf2883339a33b7544b92ea465b90c3de55082032 upstream. pstore_erase is used to erase the record from the persistent store. So if a driver has not defined pstore_erase callback return -EPERM instead of unlinking a file as deleting the file without erasing its record in persistent store will give a wrong impression to customers. Signed-off-by: Aruna Balakrishnaiah <aruna@linux.vnet.ibm.com> Acked-by: Kees Cook <keescook@chromium.org> Signed-off-by: Tony Luck <tony.luck@intel.com> Cc: HuKeping <hukeping@huawei.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
-rw-r--r--fs/pstore/inode.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/fs/pstore/inode.c b/fs/pstore/inode.c
index 3ba30825f387..eaba02d951d3 100644
--- a/fs/pstore/inode.c
+++ b/fs/pstore/inode.c
@@ -178,6 +178,8 @@ static int pstore_unlink(struct inode *dir, struct dentry *dentry)
if (p->psi->erase)
p->psi->erase(p->type, p->id, p->count,
dentry->d_inode->i_ctime, p->psi);
+ else
+ return -EPERM;
return simple_unlink(dir, dentry);
}