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authorArd Biesheuvel <ardb@kernel.org>2020-11-25 08:45:55 +0100
committerArd Biesheuvel <ardb@kernel.org>2020-11-25 16:55:02 +0100
commitff04f3b6f2e27f8ae28a498416af2a8dd5072b43 (patch)
tree113f0a79e4651d2b4ed3dc008032abf4b0d0c6d2 /fs/efivarfs
parentefi/efivars: Set generic ops before loading SSDT (diff)
downloadlinux-ff04f3b6f2e27f8ae28a498416af2a8dd5072b43.tar.xz
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efivarfs: revert "fix memory leak in efivarfs_create()"
The memory leak addressed by commit fe5186cf12e3 is a false positive: all allocations are recorded in a linked list, and freed when the filesystem is unmounted. This leads to double frees, and as reported by David, leads to crashes if SLUB is configured to self destruct when double frees occur. So drop the redundant kfree() again, and instead, mark the offending pointer variable so the allocation is ignored by kmemleak. Cc: Vamshi K Sthambamkadi <vamshi.k.sthambamkadi@gmail.com> Fixes: fe5186cf12e3 ("efivarfs: fix memory leak in efivarfs_create()") Reported-by: David Laight <David.Laight@aculab.com> Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
Diffstat (limited to 'fs/efivarfs')
-rw-r--r--fs/efivarfs/inode.c2
-rw-r--r--fs/efivarfs/super.c1
2 files changed, 2 insertions, 1 deletions
diff --git a/fs/efivarfs/inode.c b/fs/efivarfs/inode.c
index 96c0c86f3fff..0297ad95eb5c 100644
--- a/fs/efivarfs/inode.c
+++ b/fs/efivarfs/inode.c
@@ -7,6 +7,7 @@
#include <linux/efi.h>
#include <linux/fs.h>
#include <linux/ctype.h>
+#include <linux/kmemleak.h>
#include <linux/slab.h>
#include <linux/uuid.h>
@@ -103,6 +104,7 @@ static int efivarfs_create(struct inode *dir, struct dentry *dentry,
var->var.VariableName[i] = '\0';
inode->i_private = var;
+ kmemleak_ignore(var);
err = efivar_entry_add(var, &efivarfs_list);
if (err)
diff --git a/fs/efivarfs/super.c b/fs/efivarfs/super.c
index f943fd0b0699..15880a68faad 100644
--- a/fs/efivarfs/super.c
+++ b/fs/efivarfs/super.c
@@ -21,7 +21,6 @@ LIST_HEAD(efivarfs_list);
static void efivarfs_evict_inode(struct inode *inode)
{
clear_inode(inode);
- kfree(inode->i_private);
}
static const struct super_operations efivarfs_ops = {