diff options
| author | Su Yue <glass.su@suse.com> | 2024-01-08 23:11:08 +0800 |
|---|---|---|
| committer | Kent Overstreet <kent.overstreet@linux.dev> | 2024-01-21 06:01:45 -0500 |
| commit | e240c1b3635e3fc7d3ba46c6fe12a0d8efb2941a (patch) | |
| tree | 9e7c88823850aae20df1fb12766b8d50fe83c0a7 | |
| parent | 169de41985f53320580f3d347534966ea83343ca (diff) | |
bcachefs: fix memleak in bch2_split_devs
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.su@suse.com>
Reviewed-by: Brian Foster <bfoster@redhat.com>
Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
| -rw-r--r-- | fs/bcachefs/util.c | 8 |
1 files 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; } |