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| author | Shyam Prasad N <sprasad@microsoft.com> | 2023-06-22 21:16:03 +0300 |
|---|---|---|
| committer | Steve French <stfrench@microsoft.com> | 2023-06-28 19:46:32 +0300 |
| commit | 33f736187d08f6bc822117629f263b97d3df4165 (patch) | |
| tree | 59ae7a75edb9e1ff59afcf294bf7825003d04d02 /fs | |
| parent | f0b6a834a8f0d267a112b150827bb65d4fdc471c (diff) | |
| download | linux-33f736187d08f6bc822117629f263b97d3df4165.tar.xz | |
cifs: prevent use-after-free by freeing the cfile later
In smb2_compound_op we have a possible use-after-free
which can cause hard to debug problems later on.
This was revealed during stress testing with KASAN enabled
kernel. Fixing it by moving the cfile free call to
a few lines below, after the usage.
Fixes: 76894f3e2f71 ("cifs: improve symlink handling for smb2+")
Reviewed-by: Paulo Alcantara (SUSE) <pc@manguebit.com>
Signed-off-by: Shyam Prasad N <sprasad@microsoft.com>
Signed-off-by: Steve French <stfrench@microsoft.com>
Diffstat (limited to 'fs')
| -rw-r--r-- | fs/smb/client/smb2inode.c | 6 |
1 files changed, 3 insertions, 3 deletions
diff --git a/fs/smb/client/smb2inode.c b/fs/smb/client/smb2inode.c index 163a03298430..7e3ac4cb4efa 100644 --- a/fs/smb/client/smb2inode.c +++ b/fs/smb/client/smb2inode.c @@ -398,9 +398,6 @@ static int smb2_compound_op(const unsigned int xid, struct cifs_tcon *tcon, rsp_iov); finished: - if (cfile) - cifsFileInfo_put(cfile); - SMB2_open_free(&rqst[0]); if (rc == -EREMCHG) { pr_warn_once("server share %s deleted\n", tcon->tree_name); @@ -529,6 +526,9 @@ static int smb2_compound_op(const unsigned int xid, struct cifs_tcon *tcon, break; } + if (cfile) + cifsFileInfo_put(cfile); + if (rc && err_iov && err_buftype) { memcpy(err_iov, rsp_iov, 3 * sizeof(*err_iov)); memcpy(err_buftype, resp_buftype, 3 * sizeof(*err_buftype)); |