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cifs: check pointer before freeing

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commit 77b6ec01c29aade01701aa30bf1469acc7f2be76 upstream.

clang static analysis reports this problem

dfs_cache.c:591:2: warning: Argument to kfree() is a constant address
  (18446744073709551614), which is not memory allocated by malloc()
        kfree(vi);
        ^~~~~~~~~

In dfs_cache_del_vol() the volume info pointer 'vi' being freed
is the return of a call to find_vol().  The large constant address
is find_vol() returning an error.

Add an error check to dfs_cache_del_vol() similar to the one done
in dfs_cache_update_vol().

Fixes: 54be1f6c1c ("cifs: Add DFS cache routines")
Signed-off-by: Tom Rix <trix@redhat.com>
Reviewed-by: Nathan Chancellor <natechancellor@gmail.com>
CC: <stable@vger.kernel.org> # v5.0+
Signed-off-by: Steve French <stfrench@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Tom Rix 2021-01-05 12:21:26 -08:00 committed by Greg Kroah-Hartman
parent 2207c3ce70
commit 0e4c42cb4a
1 changed files with 2 additions and 1 deletions
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3
fs/cifs/dfs_cache.c
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@ -1317,7 +1317,8 @@ void dfs_cache_del_vol(const char *fullpath)
vi = find_vol(fullpath);
spin_unlock(&vol_list_lock);
kref_put(&vi->refcnt, vol_release);
if (!IS_ERR(vi))
kref_put(&vi->refcnt, vol_release);
}
/**