CVE-2022-50724

In the Linux kernel, the following vulnerability has been resolved:

regulator: core: fix resource leak in regulator_register()

I got some resource leak reports while doing fault injection test:

OF: ERROR: memory leak, expected refcount 1 instead of 100,
of_node_get()/of_node_put() unbalanced – destroy cset entry:
attach overlay node /i2c/pmic@64/regulators/buck1

unreferenced object 0xffff88810deea000 (size 512):
comm “490-i2c-rt5190a”, pid 253, jiffies 4294859840 (age 5061.046s)
hex dump (first 32 bytes):
00 00 00 00 ad 4e ad de ff ff ff ff 00 00 00 00 …..N……….
ff ff ff ff ff ff ff ff a0 1e 00 a1 ff ff ff ff …………….
backtrace:
[] kmalloc_trace+0x21/0x110
[] device_private_init+0x32/0xd0
[] device_add+0xb2d/0x1030
[] regulator_register+0xaf2/0x12a0
[] devm_regulator_register+0x57/0xb0
[] rt5190a_probe+0x52a/0x861 [rt5190a_regulator]

unreferenced object 0xffff88810b617b80 (size 32):
comm “490-i2c-rt5190a”, pid 253, jiffies 4294859904 (age 5060.983s)
hex dump (first 32 bytes):
72 65 67 75 6c 61 74 6f 72 2e 32 38 36 38 2d 53 regulator.2868-S
55 50 50 4c 59 00 ff ff 29 00 00 00 2b 00 00 00 UPPLY…)…+…
backtrace:
[] __kmalloc_node_track_caller+0x44/0x1b0
[] kstrdup+0x3a/0x70
[] create_regulator+0xc0/0x4e0
[] regulator_resolve_supply+0x2d4/0x440
[] regulator_register+0x10b3/0x12a0
[] devm_regulator_register+0x57/0xb0
[] rt5190a_probe+0x52a/0x861 [rt5190a_regulator]

After calling regulator_resolve_supply(), the ‘rdev->supply’ is set
by set_supply(), after this set, in the error path, the resources
need be released, so call regulator_put() to avoid the leaks.