[PATCH] tpm_bios: securityfs error checking fix

[firefly-linux-kernel-4.4.55.git] / drivers / char / tpm / tpm_bios.c

diff --git a/drivers/char/tpm/tpm_bios.c b/drivers/char/tpm/tpm_bios.c
index aedf7a8e6da7eec6d91c825f4e9121ae3774fb72..9ffa5643e79dd90e6c05178e093668f3e908c9af 100644 (file)
--- 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);