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| author | Zhang Xiaoxu <zhangxiaoxu5@huawei.com> | 2022-10-18 12:40:05 +0800 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2023-01-07 12:07:33 +0100 |
| commit | 44d3eac26a5e5268d11cc342dc202b0d31505c0a (patch) | |
| tree | 53bb8e735c9a938a3ff1c235a935e48fdd85471f | |
| parent | b2c92b2a3801b09b709cbefd9a9e4944b72400bf (diff) | |
| download | linux-stable-44d3eac26a5e5268d11cc342dc202b0d31505c0a.tar.gz linux-stable-44d3eac26a5e5268d11cc342dc202b0d31505c0a.tar.bz2 linux-stable-44d3eac26a5e5268d11cc342dc202b0d31505c0a.zip | |
orangefs: Fix kmemleak in orangefs_prepare_debugfs_help_string()
[ Upstream commit d23417a5bf3a3afc55de5442eb46e1e60458b0a1 ]
When insert and remove the orangefs module, then debug_help_string will
be leaked:
unreferenced object 0xffff8881652ba000 (size 4096):
comm "insmod", pid 1701, jiffies 4294893639 (age 13218.530s)
hex dump (first 32 bytes):
43 6c 69 65 6e 74 20 44 65 62 75 67 20 4b 65 79 Client Debug Key
77 6f 72 64 73 20 61 72 65 20 75 6e 6b 6e 6f 77 words are unknow
backtrace:
[<0000000004e6f8e3>] kmalloc_trace+0x27/0xa0
[<0000000006f75d85>] orangefs_prepare_debugfs_help_string+0x5e/0x480 [orangefs]
[<0000000091270a2a>] _sub_I_65535_1+0x57/0xf70 [crc_itu_t]
[<000000004b1ee1a3>] do_one_initcall+0x87/0x2a0
[<000000001d0614ae>] do_init_module+0xdf/0x320
[<00000000efef068c>] load_module+0x2f98/0x3330
[<000000006533b44d>] __do_sys_finit_module+0x113/0x1b0
[<00000000a0da6f99>] do_syscall_64+0x35/0x80
[<000000007790b19b>] entry_SYSCALL_64_after_hwframe+0x46/0xb0
When remove the module, should always free debug_help_string. Should
always free the allocated buffer when change the free_debug_help_string.
Signed-off-by: Zhang Xiaoxu <zhangxiaoxu5@huawei.com>
Signed-off-by: Mike Marshall <hubcap@omnibond.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
| -rw-r--r-- | fs/orangefs/orangefs-debugfs.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/fs/orangefs/orangefs-debugfs.c b/fs/orangefs/orangefs-debugfs.c index 7d7df003f9d8..401d70944e49 100644 --- a/fs/orangefs/orangefs-debugfs.c +++ b/fs/orangefs/orangefs-debugfs.c @@ -253,6 +253,8 @@ out: void orangefs_debugfs_cleanup(void) { debugfs_remove_recursive(debug_dir); + kfree(debug_help_string); + debug_help_string = NULL; } /* open ORANGEFS_KMOD_DEBUG_HELP_FILE */ @@ -706,6 +708,7 @@ int orangefs_prepare_debugfs_help_string(int at_boot) memset(debug_help_string, 0, DEBUG_HELP_STRING_SIZE); strlcat(debug_help_string, new, string_size); mutex_unlock(&orangefs_help_file_lock); + kfree(new); } rc = 0; |