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orangefs: Fix kmemleak in orangefs_{kernel,client}_debug_init() 

When insert and remove the orangefs module, there are memory leaked
as below:

unreferenced object 0xffff88816b0cc000 (size 2048):
  comm "insmod", pid 783, jiffies 4294813439 (age 65.512s)
  hex dump (first 32 bytes):
    6e 6f 6e 65 0a 00 00 00 00 00 00 00 00 00 00 00  none............
    00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
  backtrace:
    [<0000000031ab7788>] kmalloc_trace+0x27/0xa0
    [<000000005b405fee>] orangefs_debugfs_init.cold+0xaf/0x17f
    [<00000000e5a0085b>] 0xffffffffa02780f9
    [<000000004232d9f7>] do_one_initcall+0x87/0x2a0
    [<0000000054f22384>] do_init_module+0xdf/0x320
    [<000000003263bdea>] load_module+0x2f98/0x3330
    [<0000000052cd4153>] __do_sys_finit_module+0x113/0x1b0
    [<00000000250ae02b>] do_syscall_64+0x35/0x80
    [<00000000f11c03c7>] entry_SYSCALL_64_after_hwframe+0x46/0xb0

Use the golbal variable as the buffer rather than dynamic allocate to
slove the problem.

Signed-off-by: Zhang Xiaoxu <zhangxiaoxu5@huawei.com>
Signed-off-by: Mike Marshall <hubcap@omnibond.com>
This commit is contained in:
Zhang Xiaoxu 2022-10-18 12:40:07 +08:00 committed by Mike Marshall
parent 1f2c0e8a58
commit 31720a2b10
1 changed files with 3 additions and 23 deletions
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26
fs/orangefs/orangefs-debugfs.c
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@ -194,15 +194,10 @@ void orangefs_debugfs_init(int debug_mask)
*/
static void orangefs_kernel_debug_init(void)
{
int rc = -ENOMEM;
char *k_buffer = NULL;
static char k_buffer[ORANGEFS_MAX_DEBUG_STRING_LEN] = { };
gossip_debug(GOSSIP_DEBUGFS_DEBUG, "%s: start\n", __func__);
k_buffer = kzalloc(ORANGEFS_MAX_DEBUG_STRING_LEN, GFP_KERNEL);
if (!k_buffer)
goto out;
if (strlen(kernel_debug_string) + 1 < ORANGEFS_MAX_DEBUG_STRING_LEN) {
strcpy(k_buffer, kernel_debug_string);
strcat(k_buffer, "\n");
@ -213,9 +208,6 @@ static void orangefs_kernel_debug_init(void)
debugfs_create_file(ORANGEFS_KMOD_DEBUG_FILE, 0444, debug_dir, k_buffer,
&kernel_debug_fops);
out:
gossip_debug(GOSSIP_DEBUGFS_DEBUG, "%s: rc:%d:\n", __func__, rc);
}
@ -299,18 +291,13 @@ static int help_show(struct seq_file *m, void *v)
/*
* initialize the client-debug file.
*/
static int orangefs_client_debug_init(void)
static void orangefs_client_debug_init(void)
{
int rc = -ENOMEM;
char *c_buffer = NULL;
static char c_buffer[ORANGEFS_MAX_DEBUG_STRING_LEN] = { };
gossip_debug(GOSSIP_DEBUGFS_DEBUG, "%s: start\n", __func__);
c_buffer = kzalloc(ORANGEFS_MAX_DEBUG_STRING_LEN, GFP_KERNEL);
if (!c_buffer)
goto out;
if (strlen(client_debug_string) + 1 < ORANGEFS_MAX_DEBUG_STRING_LEN) {
strcpy(c_buffer, client_debug_string);
strcat(c_buffer, "\n");
@ -324,13 +311,6 @@ static int orangefs_client_debug_init(void)
debug_dir,
c_buffer,
&kernel_debug_fops);
rc = 0;
out:
gossip_debug(GOSSIP_DEBUGFS_DEBUG, "%s: rc:%d:\n", __func__, rc);
return rc;
}
/* open ORANGEFS_KMOD_DEBUG_FILE or ORANGEFS_CLIENT_DEBUG_FILE.*/