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authorAl Viro <viro@zeniv.linux.org.uk>2016-01-23 02:08:52 +0300
committerAl Viro <viro@zeniv.linux.org.uk>2016-01-23 02:08:52 +0300
commit3ed47db34f480df7caf44436e3e63e555351ae9a (patch)
treeaea60132d6706c44c155c1281c5c3ec1f3fb76b6 /mm/shmem.c
parent5955102c9984fa081b2d570cfac75c97eecf8f3b (diff)
downloadlinux-3ed47db34f480df7caf44436e3e63e555351ae9a.tar.xz
make sure that freeing shmem fast symlinks is RCU-delayed
Cc: stable@vger.kernel.org # v4.2+ Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Diffstat (limited to 'mm/shmem.c')
-rw-r--r--mm/shmem.c9
1 files changed, 4 insertions, 5 deletions
diff --git a/mm/shmem.c b/mm/shmem.c
index 38c5e72c7008..440e2a7e6c1c 100644
--- a/mm/shmem.c
+++ b/mm/shmem.c
@@ -701,8 +701,7 @@ static void shmem_evict_inode(struct inode *inode)
list_del_init(&info->swaplist);
mutex_unlock(&shmem_swaplist_mutex);
}
- } else
- kfree(info->symlink);
+ }
simple_xattrs_free(&info->xattrs);
WARN_ON(inode->i_blocks);
@@ -2549,13 +2548,12 @@ static int shmem_symlink(struct inode *dir, struct dentry *dentry, const char *s
info = SHMEM_I(inode);
inode->i_size = len-1;
if (len <= SHORT_SYMLINK_LEN) {
- info->symlink = kmemdup(symname, len, GFP_KERNEL);
- if (!info->symlink) {
+ inode->i_link = kmemdup(symname, len, GFP_KERNEL);
+ if (!inode->i_link) {
iput(inode);
return -ENOMEM;
}
inode->i_op = &shmem_short_symlink_operations;
- inode->i_link = info->symlink;
} else {
inode_nohighmem(inode);
error = shmem_getpage(inode, 0, &page, SGP_WRITE, NULL);
@@ -3132,6 +3130,7 @@ static struct inode *shmem_alloc_inode(struct super_block *sb)
static void shmem_destroy_callback(struct rcu_head *head)
{
struct inode *inode = container_of(head, struct inode, i_rcu);
+ kfree(inode->i_link);
kmem_cache_free(shmem_inode_cachep, SHMEM_I(inode));
}