[PATCH v3] bcachefs: fix memleak in bch2_split_devs

[Su Yue]

The pointer dev_name can be modified by strseq(),
then causes the memleak:

unreferenced object 0xffff9d08a2916c80 (size 32):
  comm "mount.bcachefs", pid 9090, jiffies 4295856224 (age 17.564s)
  hex dump (first 32 bytes):
    2f 64 65 76 2f 6d 61 70 70 65 72 2f 74 65 73 74  /dev/mapper/test
    2d 30 00 00 00 00 00 00 00 00 00 00 00 00 00 00  -0..............
  backtrace:
    [<00000000c5d3be7d>] __kmem_cache_alloc_node+0x1f3/0x2c0
    [<0000000052215d26>] __kmalloc_node_track_caller+0x51/0x150
    [<0000000069fea956>] kstrdup+0x32/0x60
    [<000000000877fcf1>] bch2_split_devs+0x3f/0x150 [bcachefs]
    [<000000007ee93204>] bch2_mount+0xcb/0x640 [bcachefs]
    [<000000002dd1e04b>] legacy_get_tree+0x30/0x60
    [<000000006afc31d3>] vfs_get_tree+0x28/0xf0
    [<000000007b0c538e>] path_mount+0x475/0xb60
    [<0000000092de5882>] __x64_sys_mount+0x105/0x140
    [<0000000054fc05d8>] do_syscall_64+0x42/0xf0
    [<00000000df584910>] entry_SYSCALL_64_after_hwframe+0x6e/0x76

Fix it by copy pointer dev_name at beginning and free the copied
pointer at end.

Signed-off-by: Su Yue <glass...@suse.com>
---
changelog:
v3:
    Add the missing the memleak report.
v2:
    Remove the unnecessary assignment.    
---
 fs/bcachefs/util.c | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/fs/bcachefs/util.c b/fs/bcachefs/util.c
index c2ef7cddaa4f..f927c8a19e24 100644
--- a/fs/bcachefs/util.c
+++ b/fs/bcachefs/util.c
@@ -1186,7 +1186,9 @@ int bch2_split_devs(const char *_dev_name, darray_str 
*ret)
 {
        darray_init(ret);
 
-       char *dev_name = kstrdup(_dev_name, GFP_KERNEL), *s = dev_name;
+       char *dev_name, *s, *orig;
+
+       dev_name = orig = kstrdup(_dev_name, GFP_KERNEL);
        if (!dev_name)
                return -ENOMEM;
 
@@ -1201,10 +1203,10 @@ int bch2_split_devs(const char *_dev_name, darray_str 
*ret)
                }
        }
 
-       kfree(dev_name);
+       kfree(orig);
        return 0;
 err:
        bch2_darray_str_exit(ret);
-       kfree(dev_name);
+       kfree(orig);
        return -ENOMEM;
 }
-- 
2.43.0