CVE-2022-50566

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

mtd: Fix device name leak when register device failed in add_mtd_device()

There is a kmemleak when register device failed: unreferenced object 0xffff888101aab550 (size 8): comm insmod, pid 3922, jiffies 4295277753 (age 925.408s) hex dump (first 8 bytes): 6d 74 64 30 00 88 ff ff mtd0…. backtrace: [<00000000bde26724>] __kmalloc_node_track_caller+0x4e/0x150 [<000000003c32b416>] kvasprintf+0xb0/0x130 [<000000001f7a8f15>] kobject_set_name_vargs+0x2f/0xb0 [<000000006e781163>] dev_set_name+0xab/0xe0 [<00000000e30d0c78>] add_mtd_device+0x4bb/0x700 [<00000000f3d34de7>] mtd_device_parse_register+0x2ac/0x3f0 [<00000000c0d88488>] 0xffffffffa0238457 [<00000000b40d0922>] 0xffffffffa02a008f [<0000000023d17b9d>] do_one_initcall+0x87/0x2a0 [<00000000770f6ca6>] do_init_module+0xdf/0x320 [<000000007b6768fe>] load_module+0x2f98/0x3330 [<00000000346bed5a>] __do_sys_finit_module+0x113/0x1b0 [<00000000674c2290>] do_syscall_64+0x35/0x80 [<000000004c6a8d97>] entry_SYSCALL_64_after_hwframe+0x46/0xb0

If register device failed, should call put_device() to give up the reference.

Affected Software

References

• https://git.kernel.org/stable/c/1b172fb05d6315ecec082fd7544a3390e96f0d7e
• https://git.kernel.org/stable/c/2302e2dc42b1f84f951c725ce742fc21c5a1e151
• https://git.kernel.org/stable/c/330bc5533e8a8ed69cb951d5a8edce9bddb9db21
• https://git.kernel.org/stable/c/71212d73184845c944ef1b43f092e643e5bde003
• https://git.kernel.org/stable/c/895d68a39481a75c680aa421546931fb11942fa6
• https://git.kernel.org/stable/c/a75f45afa932bfb24a2603ebcea5efd2e7cdcfd6
• https://git.kernel.org/stable/c/bcabe1dc2a344adbb3382930a23e273ba9382277
• https://git.kernel.org/stable/c/db07fe76df01f40cb897d6e9066b84e46957beb3
• https://git.kernel.org/stable/c/fa0d32ab8407d7481450c664fd0de64f2dae9489