Hi Jaegeuk,
> -----Original Message-----
> From: Jaegeuk Kim [mailto:jaeg...@kernel.org]
> Sent: Tuesday, December 29, 2015 7:32 AM
> To: linux-kernel@vger.kernel.org; linux-fsde...@vger.kernel.org;
> linux-f2fs-de...@lists.sourceforge.net
> Cc: Jaegeuk Kim
> Subject: [f2fs-dev] [PATCH 1/3] f2fs: early check broken symlink length in
> the encrypted case
>
> If link is broken, its len is zero, and we don't need to move forward.
>
> Signed-off-by: Jaegeuk Kim <jaeg...@kernel.org>
> ---
> fs/f2fs/namei.c | 10 ++++++++--
> 1 file changed, 8 insertions(+), 2 deletions(-)
>
> diff --git a/fs/f2fs/namei.c b/fs/f2fs/namei.c
> index fb41c80..5cc4128 100644
> --- a/fs/f2fs/namei.c
> +++ b/fs/f2fs/namei.c
> @@ -931,7 +931,7 @@ static const char *f2fs_encrypted_follow_link(struct
> dentry *dentry, void
> **cook
> {
> struct page *cpage = NULL;
> char *caddr, *paddr = NULL;
> - struct f2fs_str cstr;
> + struct f2fs_str cstr = FSTR_INIT(NULL, 0);
> struct f2fs_str pstr = FSTR_INIT(NULL, 0);
> struct inode *inode = d_inode(dentry);
> struct f2fs_encrypted_symlink_data *sd;
> @@ -952,6 +952,12 @@ static const char *f2fs_encrypted_follow_link(struct
> dentry *dentry, void
> **cook
> /* Symlink is encrypted */
> sd = (struct f2fs_encrypted_symlink_data *)caddr;
> cstr.len = le16_to_cpu(sd->len);
> +
> + /* this is broken symlink case */
> + if (cstr.len == 0) {
This case seems rare, can we add unlikely here?
> + res = -ENOENT;
> + goto errout;
> + }
> cstr.name = kmalloc(cstr.len, GFP_NOFS);
> if (!cstr.name) {
> res = -ENOMEM;
> @@ -960,7 +966,7 @@ static const char *f2fs_encrypted_follow_link(struct
> dentry *dentry, void
> **cook
> memcpy(cstr.name, sd->encrypted_path, cstr.len);
>
> /* this is broken symlink case */
> - if (cstr.name[0] == 0 && cstr.len == 0) {
> + if (cstr.name[0] == 0) {
ditto.
Thanks,
> res = -ENOENT;
> goto errout;
> }
> --
> 2.5.4 (Apple Git-61)
>
>
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