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| author | Gustavo A. R. Silva <gustavo@embeddedor.com> | 2018-04-13 17:13:29 +0200 |
|---|---|---|
| committer | Steve French <stfrench@microsoft.com> | 2018-04-17 21:44:30 +0200 |
| commit | 0d568cd34eb04acf05c26f360d1a0f071f0bb636 (patch) | |
| tree | a044c5c68f8451cf9f87e3fea4b6d1272bd12750 /fs/cifs | |
| parent | Merge branch 'parisc-4.17-3' of git://git.kernel.org/pub/scm/linux/kernel/git... (diff) | |
| download | linux-0d568cd34eb04acf05c26f360d1a0f071f0bb636.tar.xz linux-0d568cd34eb04acf05c26f360d1a0f071f0bb636.zip | |
cifs: smb2ops: Fix NULL check in smb2_query_symlink
The current code null checks variable err_buf, which is always null
when it is checked, hence utf16_path is free'd and the function
returns -ENOENT everytime it is called, making it impossible for the
execution path to reach the following code:
err_buf = err_iov.iov_base;
Fix this by null checking err_iov.iov_base instead of err_buf. Also,
notice that err_buf no longer needs to be initialized to NULL.
Addresses-Coverity-ID: 1467876 ("Logically dead code")
Fixes: 2d636199e400 ("cifs: Change SMB2_open to return an iov for the error parameter")
Signed-off-by: Gustavo A. R. Silva <gustavo@embeddedor.com>
Signed-off-by: Steve French <smfrench@gmail.com>
Reviewed-by: Pavel Shilovsky <pshilov@microsoft.com>
Diffstat (limited to 'fs/cifs')
| -rw-r--r-- | fs/cifs/smb2ops.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/fs/cifs/smb2ops.c b/fs/cifs/smb2ops.c index b4ae932ea134..38ebf3f357d2 100644 --- a/fs/cifs/smb2ops.c +++ b/fs/cifs/smb2ops.c @@ -1452,7 +1452,7 @@ smb2_query_symlink(const unsigned int xid, struct cifs_tcon *tcon, struct cifs_open_parms oparms; struct cifs_fid fid; struct kvec err_iov = {NULL, 0}; - struct smb2_err_rsp *err_buf = NULL; + struct smb2_err_rsp *err_buf; struct smb2_symlink_err_rsp *symlink; unsigned int sub_len; unsigned int sub_offset; @@ -1476,7 +1476,7 @@ smb2_query_symlink(const unsigned int xid, struct cifs_tcon *tcon, rc = SMB2_open(xid, &oparms, utf16_path, &oplock, NULL, &err_iov); - if (!rc || !err_buf) { + if (!rc || !err_iov.iov_base) { kfree(utf16_path); return -ENOENT; } |