[PATCH] tpm_bios: securityfs error checking fix

These functions return ERR_PTR()s on error, not NULL.

Spotted by Randy.

Cc: Serge Hallyn <serue@us.ibm.com>
Cc: Kylene Jo Hall <kjhall@us.ibm.com>
Cc: "Randy.Dunlap" <rdunlap@xenotime.net>
Acked-by: Greg KH <greg@kroah.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1 files changed, 12 insertions, 3 deletions

diff --git a/drivers/char/tpm/tpm_bios.c b/drivers/char/tpm/tpm_bios.c
index aedf7a8e6da7..9ffa5643e79d 100644
--- a/drivers/char/tpm/tpm_bios.c
+++ b/drivers/char/tpm/tpm_bios.c
@@ -487,26 +487,35 @@ struct file_operations tpm_binary_bios_measurements_ops = {
         .release = tpm_bios_measurements_release,
 };
 
+static int is_bad(void *p)
+{
+        if (!p)
+                return 1;
+        if (IS_ERR(p) && (PTR_ERR(p) != -ENODEV))
+                return 1;
+        return 0;
+}
+
 struct dentry **tpm_bios_log_setup(char *name)
 {
         struct dentry **ret = NULL, *tpm_dir, *bin_file, *ascii_file;
 
         tpm_dir = securityfs_create_dir(name, NULL);
-        if (!tpm_dir)
+        if (is_bad(tpm_dir))
                 goto out;
 
         bin_file =
             securityfs_create_file("binary_bios_measurements",
                                    S_IRUSR | S_IRGRP, tpm_dir, NULL,
                                    &tpm_binary_bios_measurements_ops);
-        if (!bin_file)
+        if (is_bad(bin_file))
                 goto out_tpm;
 
         ascii_file =
             securityfs_create_file("ascii_bios_measurements",
                                    S_IRUSR | S_IRGRP, tpm_dir, NULL,
                                    &tpm_ascii_bios_measurements_ops);
-        if (!ascii_file)
+        if (is_bad(ascii_file))
                 goto out_bin;
 
         ret = kmalloc(3 * sizeof(struct dentry *), GFP_KERNEL);