CVE-2022-49891

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

tracing: kprobe: Fix memory leak in testgenkprobe/kretprobe_cmd()

testgenkprobecmd() only free buf in fail path, hence buf will leak when there is no failure. Move kfree(buf) from fail path to common path to prevent the memleak. The same reason and solution in testgenkretprobecmd().

unreferenced object 0xffff888143b14000 (size 2048): comm "insmod", pid 52490, jiffies 4301890980 (age 40.553s) hex dump (first 32 bytes): 70 3a 6b 70 72 6f 62 65 73 2f 67 65 6e 5f 6b 70 p:kprobes/genkp 72 6f 62 65 5f 74 65 73 74 20 64 6f 5f 73 79 73 robetest dosys backtrace: [<000000006d7b836b>] kmalloctrace+0x27/0xa0 [<0000000009528b5b>] 0xffffffffa059006f [<000000008408b580>] dooneinitcall+0x87/0x2a0 [<00000000c4980a7e>] doinitmodule+0xdf/0x320 [<00000000d775aad0>] load_module+0x3006/0x3390 [<00000000e9a74b80>] _dosysfinitmodule+0x113/0x1b0 [<000000003726480d>] dosyscall64+0x35/0x80 [<000000003441e93b>] entrySYSCALL64afterhwframe+0x46/0xb0