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| author |   Wang Hai <wanghai38@huawei.com> | 2020-12-01 21:59:29 +0800 |
|---|---|---|
| committer |   Dan Williams <dan.j.williams@intel.com> | 2020-12-15 22:03:52 -0800 |
| commit | 1aa574312518ef1d60d2dc62d58f7021db3b163a (patch) | |
| tree | 46a3db32f21c7be72fc7924d305dab937e3d62a5 /drivers/dax | |
| parent | device-dax/pmem: Convert comma to semicolon (diff) | |
| download | linux-dev-1aa574312518ef1d60d2dc62d58f7021db3b163a.tar.xz linux-dev-1aa574312518ef1d60d2dc62d58f7021db3b163a.zip | |
device-dax/core: Fix memory leak when rmmod dax.ko
When I repeatedly modprobe and rmmod dax.ko, kmemleak report a
memory leak as follows:
unreferenced object 0xffff9a5588c05088 (size 8):
comm "modprobe", pid 261, jiffies 4294693644 (age 42.063s)
...
backtrace:
[<00000000e007ced0>] kstrdup+0x35/0x70
[<000000002ae73897>] kstrdup_const+0x3d/0x50
[<000000002b00c9c3>] kvasprintf_const+0xbc/0xf0
[<000000008023282f>] kobject_set_name_vargs+0x3b/0xd0
[<00000000d2cbaa4e>] kobject_set_name+0x62/0x90
[<00000000202e7a22>] bus_register+0x7f/0x2b0
[<000000000b77792c>] 0xffffffffc02840f7
[<000000002d5be5ac>] 0xffffffffc02840b4
[<00000000dcafb7cd>] do_one_initcall+0x58/0x240
[<00000000049fe480>] do_init_module+0x56/0x1e2
[<0000000022671491>] load_module+0x2517/0x2840
[<000000001a2201cb>] __do_sys_finit_module+0x9c/0xe0
[<000000003eb304e7>] do_syscall_64+0x33/0x40
[<0000000051c5fd06>] entry_SYSCALL_64_after_hwframe+0x44/0xa9
When rmmod dax is executed, dax_bus_exit() is missing. This patch
can fix this bug.
Fixes: 9567da0b408a ("device-dax: Introduce bus + driver model")
Cc: <stable@vger.kernel.org>
Reported-by: Hulk Robot <hulkci@huawei.com>
Signed-off-by: Wang Hai <wanghai38@huawei.com>
Link: https://lore.kernel.org/r/20201201135929.66530-1-wanghai38@huawei.com
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Diffstat (limited to 'drivers/dax')
| -rw-r--r-- | drivers/dax/super.c | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/drivers/dax/super.c b/drivers/dax/super.c index edc279be3e59..cadbd0a1a1ef 100644 --- a/drivers/dax/super.c +++ b/drivers/dax/super.c @@ -752,6 +752,7 @@ err_chrdev: static void __exit dax_core_exit(void) { + dax_bus_exit(); unregister_chrdev_region(dax_devt, MINORMASK+1); ida_destroy(&dax_minor_ida); dax_fs_exit(); |