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| author | Yang Yingliang <yangyingliang@huawei.com> | 2021-10-20 11:18:34 +0300 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2021-10-20 16:44:33 +0300 |
| commit | 4225fea1cb28370086e17e82c0f69bec2779dca0 (patch) | |
| tree | df2654b1ae4820470a5cfa66b9dd87e438bcf97f | |
| parent | 3cb958027cb8b78d3ee639ce9af54c2ef1bf964f (diff) | |
| download | linux-4225fea1cb28370086e17e82c0f69bec2779dca0.tar.xz | |
ptp: Fix possible memory leak in ptp_clock_register()
I got memory leak as follows when doing fault injection test:
unreferenced object 0xffff88800906c618 (size 8):
comm "i2c-idt82p33931", pid 4421, jiffies 4294948083 (age 13.188s)
hex dump (first 8 bytes):
70 74 70 30 00 00 00 00 ptp0....
backtrace:
[<00000000312ed458>] __kmalloc_track_caller+0x19f/0x3a0
[<0000000079f6e2ff>] kvasprintf+0xb5/0x150
[<0000000026aae54f>] kvasprintf_const+0x60/0x190
[<00000000f323a5f7>] kobject_set_name_vargs+0x56/0x150
[<000000004e35abdd>] dev_set_name+0xc0/0x100
[<00000000f20cfe25>] ptp_clock_register+0x9f4/0xd30 [ptp]
[<000000008bb9f0de>] idt82p33_probe.cold+0x8b6/0x1561 [ptp_idt82p33]
When posix_clock_register() returns an error, the name allocated
in dev_set_name() will be leaked, the put_device() should be used
to give up the device reference, then the name will be freed in
kobject_cleanup() and other memory will be freed in ptp_clock_release().
Reported-by: Hulk Robot <hulkci@huawei.com>
Fixes: a33121e5487b ("ptp: fix the race between the release of ptp_clock and cdev")
Signed-off-by: Yang Yingliang <yangyingliang@huawei.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
| -rw-r--r-- | drivers/ptp/ptp_clock.c | 15 |
1 files changed, 11 insertions, 4 deletions
diff --git a/drivers/ptp/ptp_clock.c b/drivers/ptp/ptp_clock.c index 4dfc52e06704..7fd02aabd79a 100644 --- a/drivers/ptp/ptp_clock.c +++ b/drivers/ptp/ptp_clock.c @@ -283,15 +283,22 @@ struct ptp_clock *ptp_clock_register(struct ptp_clock_info *info, /* Create a posix clock and link it to the device. */ err = posix_clock_register(&ptp->clock, &ptp->dev); if (err) { + if (ptp->pps_source) + pps_unregister_source(ptp->pps_source); + + kfree(ptp->vclock_index); + + if (ptp->kworker) + kthread_destroy_worker(ptp->kworker); + + put_device(&ptp->dev); + pr_err("failed to create posix clock\n"); - goto no_clock; + return ERR_PTR(err); } return ptp; -no_clock: - if (ptp->pps_source) - pps_unregister_source(ptp->pps_source); no_pps: ptp_cleanup_pin_groups(ptp); no_pin_groups: |