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    • Anton Blanchard's avatar
      net: Fix corruption in /proc/*/net/dev_mcast · 5cac98dd
      Anton Blanchard authored
      I just hit this during my testing. Isn't there another bug lurking?
      
      BUG kmalloc-8: Redzone overwritten
      
      INFO: 0xc0000000de9dec48-0xc0000000de9dec4b. First byte 0x0 instead of 0xcc
      INFO: Allocated in .__seq_open_private+0x30/0xa0 age=0 cpu=5 pid=3896
      	.__kmalloc+0x1e0/0x2d0
      	.__seq_open_private+0x30/0xa0
      	.seq_open_net+0x60/0xe0
      	.dev_mc_seq_open+0x4c/0x70
      	.proc_reg_open+0xd8/0x260
      	.__dentry_open.clone.11+0x2b8/0x400
      	.do_last+0xf4/0x950
      	.path_openat+0xf8/0x480
      	.do_filp_open+0x48/0xc0
      	.do_sys_open+0x140/0x250
      	syscall_exit+0x0/0x40
      
      dev_mc_seq_ops uses dev_seq_start/next/stop but only allocates
      sizeof(struct seq_net_private) of private data, whereas it expects
      sizeof(struct dev_iter_state):
      
      struct dev_iter_state {
      	struct seq_net_private p;
      	unsigned int pos; /* bucket << BUCKET_SPACE + offset */
      };
      
      Create dev_seq_open_ops and use it so we don't have to expose
      struct dev_iter_state.
      
      [ Problem added by commit f04565dd (dev: use name hash for
        dev_seq_ops) -Eric ]
      Signed-off-by: default avatarAnton Blanchard <anton@samba.org>
      Acked-by: default avatarEric Dumazet <eric.dumazet@gmail.com>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      5cac98dd
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