bios_dir is defined as struct dentry **bios_dir, which results in
dynamic allocation and possible memory leak. This patch replaces
it with struct dentry array i.e. struct dentry *bios_dir[3]
similar to what is done for sysfs groups.
Suggested-by: Jason Gunthorpe <jguntho...@obsidianresearch.com>
Signed-off-by: Nayna Jain <na...@linux.vnet.ibm.com>
---
drivers/char/tpm/tpm-chip.c | 5 ++--
drivers/char/tpm/tpm.h | 3 ++-
drivers/char/tpm/tpm_eventlog.c | 60 ++++++++++++++++++-----------------------
drivers/char/tpm/tpm_eventlog.h | 10 +++----
4 files changed, 35 insertions(+), 43 deletions(-)
diff --git a/drivers/char/tpm/tpm-chip.c b/drivers/char/tpm/tpm-chip.c
index e595013..1cd1238 100644
--- a/drivers/char/tpm/tpm-chip.c
+++ b/drivers/char/tpm/tpm-chip.c
@@ -283,7 +283,7 @@ static int tpm1_chip_register(struct tpm_chip *chip)
tpm_sysfs_add_device(chip);
- chip->bios_dir = tpm_bios_log_setup(dev_name(&chip->dev));
+ tpm_bios_log_setup(chip);
return 0;
}
@@ -293,8 +293,7 @@ static void tpm1_chip_unregister(struct tpm_chip *chip)
if (chip->flags & TPM_CHIP_FLAG_TPM2)
return;
- if (chip->bios_dir)
- tpm_bios_log_teardown(chip->bios_dir);
+ tpm_bios_log_teardown(chip);
}
static void tpm_del_legacy_sysfs(struct tpm_chip *chip)
diff --git a/drivers/char/tpm/tpm.h b/drivers/char/tpm/tpm.h
index 6e002c4..603a661 100644
--- a/drivers/char/tpm/tpm.h
+++ b/drivers/char/tpm/tpm.h
@@ -171,7 +171,8 @@ struct tpm_chip {
unsigned long duration[3]; /* jiffies */
bool duration_adjusted;
- struct dentry **bios_dir;
+ struct dentry *bios_dir[3];
+ unsigned int bios_dir_count;
const struct attribute_group *groups[3];
unsigned int groups_cnt;
diff --git a/drivers/char/tpm/tpm_eventlog.c b/drivers/char/tpm/tpm_eventlog.c
index b0a4d02..9dd69a7 100644
--- a/drivers/char/tpm/tpm_eventlog.c
+++ b/drivers/char/tpm/tpm_eventlog.c
@@ -332,7 +332,8 @@ static int tpm_bios_measurements_open(struct inode *inode,
if (!log)
return -ENOMEM;
- if ((err = read_log(log)))
+ err = read_log(log);
+ if (err)
goto out_free;
/* now register seq file */
@@ -368,54 +369,45 @@ static int is_bad(void *p)
return 0;
}
-struct dentry **tpm_bios_log_setup(const char *name)
+void tpm_bios_log_setup(struct tpm_chip *chip)
{
- struct dentry **ret = NULL, *tpm_dir, *bin_file, *ascii_file;
+ const char *name = dev_name(&chip->dev);
- tpm_dir = securityfs_create_dir(name, NULL);
- if (is_bad(tpm_dir))
- goto out;
+ chip->bios_dir_count = 0;
+ chip->bios_dir[chip->bios_dir_count] = securityfs_create_dir(name,
+ NULL);
+ if (is_bad(chip->bios_dir[chip->bios_dir_count]))
+ goto err;
+ chip->bios_dir_count++;
- bin_file =
+ chip->bios_dir[chip->bios_dir_count] =
securityfs_create_file("binary_bios_measurements",
- S_IRUSR | S_IRGRP, tpm_dir,
+ S_IRUSR | S_IRGRP, chip->bios_dir[0],
(void *)&tpm_binary_b_measurments_seqops,
&tpm_bios_measurements_ops);
- if (is_bad(bin_file))
- goto out_tpm;
+ if (is_bad(chip->bios_dir[chip->bios_dir_count]))
+ goto err;
+ chip->bios_dir_count++;
- ascii_file =
+ chip->bios_dir[chip->bios_dir_count] =
securityfs_create_file("ascii_bios_measurements",
- S_IRUSR | S_IRGRP, tpm_dir,
+ S_IRUSR | S_IRGRP, chip->bios_dir[0],
(void *)&tpm_ascii_b_measurments_seqops,
&tpm_bios_measurements_ops);
- if (is_bad(ascii_file))
- goto out_bin;
+ if (is_bad(chip->bios_dir[chip->bios_dir_count]))
+ goto err;
+ chip->bios_dir_count++;
- ret = kmalloc(3 * sizeof(struct dentry *), GFP_KERNEL);
- if (!ret)
- goto out_ascii;
+ return;
- ret[0] = ascii_file;
- ret[1] = bin_file;
- ret[2] = tpm_dir;
-
- return ret;
-
-out_ascii:
- securityfs_remove(ascii_file);
-out_bin:
- securityfs_remove(bin_file);
-out_tpm:
- securityfs_remove(tpm_dir);
-out:
- return NULL;
+err:
+ tpm_bios_log_teardown(chip);
}
-void tpm_bios_log_teardown(struct dentry **lst)
+void tpm_bios_log_teardown(struct tpm_chip *chip)
{
int i;
- for (i = 0; i < 3; i++)
- securityfs_remove(lst[i]);
+ for (i = chip->bios_dir_count; i > 0; --i)
+ securityfs_remove(chip->bios_dir[i-1]);
}
diff --git a/drivers/char/tpm/tpm_eventlog.h b/drivers/char/tpm/tpm_eventlog.h
index 8de62b0..67621c9 100644
--- a/drivers/char/tpm/tpm_eventlog.h
+++ b/drivers/char/tpm/tpm_eventlog.h
@@ -77,14 +77,14 @@ int read_log(struct tpm_bios_log *log);
#if defined(CONFIG_TCG_IBMVTPM) || defined(CONFIG_TCG_IBMVTPM_MODULE) || \
defined(CONFIG_ACPI)
-extern struct dentry **tpm_bios_log_setup(const char *);
-extern void tpm_bios_log_teardown(struct dentry **);
+extern void tpm_bios_log_setup(struct tpm_chip *chip);
+extern void tpm_bios_log_teardown(struct tpm_chip *chip);
#else
-static inline struct dentry **tpm_bios_log_setup(const char *name)
+static inline void tpm_bios_log_setup(struct tpm_chip *chip)
{
- return NULL;
+ chip->bios_dir_count = 0;
}
-static inline void tpm_bios_log_teardown(struct dentry **dir)
+static inline void tpm_bios_log_teardown(struct tpm_chip *chip)
{
}
#endif
--
2.5.0
------------------------------------------------------------------------------
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