Commit-ID: 22c2b77f419bdc9317f00b395283abd33157368e
Gitweb: http://git.kernel.org/tip/22c2b77f419bdc9317f00b395283abd33157368e
Author: Matt Fleming <matt@xxxxxxxxxxxxxxxxxxx>
AuthorDate: Mon, 15 Aug 2016 15:29:20 +0100
Committer: Matt Fleming <matt@xxxxxxxxxxxxxxxxxxx>
CommitDate: Fri, 9 Sep 2016 16:08:48 +0100
fs/efivarfs: Fix double kfree() in error path
Julia reported that we may double free 'name' in efivarfs_callback(),
and that this bug was introduced by commit 0d22f33bc37c ("efi: Don't
use spinlocks for efi vars").
Move one of the kfree()s until after the point at which we know we are
definitely on the success path.
Reported-by: Julia Lawall <julia.lawall@xxxxxxx>
Acked-by: Julia Lawall <julia.lawall@xxxxxxx>
Cc: Ard Biesheuvel <ard.biesheuvel@xxxxxxxxxx>
Cc: Sylvain Chouleur <sylvain.chouleur@xxxxxxxxx>
Signed-off-by: Matt Fleming <matt@xxxxxxxxxxxxxxxxxxx>
---
fs/efivarfs/super.c | 6 +++---
1 file changed, 3 insertions(+), 3 deletions(-)
diff --git a/fs/efivarfs/super.c b/fs/efivarfs/super.c
index 01e3d6e..d7a7c53 100644
--- a/fs/efivarfs/super.c
+++ b/fs/efivarfs/super.c
@@ -157,14 +157,14 @@ static int efivarfs_callback(efi_char16_t *name16, efi_guid_t vendor,
goto fail_inode;
}
- /* copied by the above to local storage in the dentry. */
- kfree(name);
-
efivar_entry_size(entry, &size);
err = efivar_entry_add(entry, &efivarfs_list);
if (err)
goto fail_inode;
+ /* copied by the above to local storage in the dentry. */
+ kfree(name);
+
inode_lock(inode);
inode->i_private = entry;
i_size_write(inode, size + sizeof(entry->var.Attributes));
--
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