Signed-off-by: Jeff Layton <[email protected]>
---
fs/namei.c | 30 ++++++++++++++++++++----------
1 file changed, 20 insertions(+), 10 deletions(-)
diff --git a/fs/namei.c b/fs/namei.c
index 9fd5163..9986117 100644
--- a/fs/namei.c
+++ b/fs/namei.c
@@ -3468,24 +3468,34 @@ SYSCALL_DEFINE3(symlinkat, const char __user *, oldname,
int, newdfd, const char __user *, newname)
{
int error;
- char *from;
+ char *from, *to;
struct dentry *dentry;
struct path path;
+ unsigned int try = 0;
from = getname(oldname);
if (IS_ERR(from))
return PTR_ERR(from);
- dentry = user_path_create(newdfd, newname, &path, 0);
- error = PTR_ERR(dentry);
- if (IS_ERR(dentry))
- goto out_putname;
+ to = getname(newname);
+ if (IS_ERR(to)) {
+ putname(from);
+ return PTR_ERR(to);
+ }
- error = security_path_symlink(&path, dentry, from);
- if (!error)
- error = vfs_symlink(path.dentry->d_inode, dentry, from);
- done_path_create(&path, dentry);
-out_putname:
+ do {
+ dentry = kern_path_create(newdfd, to, &path, 0, try);
+ if (IS_ERR(dentry)) {
+ error = PTR_ERR(dentry);
+ break;
+ }
+
+ error = security_path_symlink(&path, dentry, from);
+ if (!error)
+ error = vfs_symlink(path.dentry->d_inode, dentry, from);
+ done_path_create(&path, dentry);
+ } while (retry_estale(error, try++));
+ putname(to);
putname(from);
return error;
}
--
1.7.11.2
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