漏洞信息
                                
                                    
                                        
                                        # __class_register() 可能内存泄漏修复
N/A
                                        
                                    
                                 
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    漏洞标题
    
        
            class: fix possible memory leak in __class_register()
        
        
    
                                
    漏洞描述信息
    
        
            In the Linux kernel, the following vulnerability has been resolved:
class: fix possible memory leak in __class_register()
If class_add_groups() returns error, the 'cp->subsys' need be
unregister, and the 'cp' need be freed.
We can not call kset_unregister() here, because the 'cls' will
be freed in callback function class_release() and it's also
freed in caller's error path, it will cause double free.
So fix this by calling kobject_del() and kfree_const(name) to
cleanup kobject. Besides, call kfree() to free the 'cp'.
Fault injection test can trigger this:
unreferenced object 0xffff888102fa8190 (size 8):
  comm "modprobe", pid 502, jiffies 4294906074 (age 49.296s)
  hex dump (first 8 bytes):
    70 6b 74 63 64 76 64 00                          pktcdvd.
  backtrace:
    [<00000000e7c7703d>] __kmalloc_track_caller+0x1ae/0x320
    [<000000005e4d70bc>] kstrdup+0x3a/0x70
    [<00000000c2e5e85a>] kstrdup_const+0x68/0x80
    [<000000000049a8c7>] kvasprintf_const+0x10b/0x190
    [<0000000029123163>] kobject_set_name_vargs+0x56/0x150
    [<00000000747219c9>] kobject_set_name+0xab/0xe0
    [<0000000005f1ea4e>] __class_register+0x15c/0x49a
unreferenced object 0xffff888037274000 (size 1024):
  comm "modprobe", pid 502, jiffies 4294906074 (age 49.296s)
  hex dump (first 32 bytes):
    00 40 27 37 80 88 ff ff 00 40 27 37 80 88 ff ff  .@'7.....@'7....
    00 00 00 00 ad 4e ad de ff ff ff ff 00 00 00 00  .....N..........
  backtrace:
    [<00000000151f9600>] kmem_cache_alloc_trace+0x17c/0x2f0
    [<00000000ecf3dd95>] __class_register+0x86/0x49a
        
        
    
                                
    CVSS信息
    
        
            N/A
        
        
    
                                
    漏洞类别
    
        
            N/A
        
        
    
                            
                         
                    
                
                    
                    
                        
                            
                            
                                
    漏洞标题
    
        
            Linux kernel 安全漏洞
        
        
    
                                
    漏洞描述信息
    
        
            Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞,该漏洞源于__class_register函数中错误处理不当,可能导致内存泄漏。
        
        
    
                                
    CVSS信息
    
        
            N/A
        
        
    
                                
    漏洞类别
    
        
            其他