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dccp: change L/R must have at least one byte in the dccpsf_val field

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Thanks to Eugene Teo for reporting this problem.
    
Signed-off-by: Eugene Teo <eugenete@kernel.sg>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Signed-off-by: Gerrit Renker <gerrit@erg.abdn.ac.uk>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Arnaldo Carvalho de Melo 2008-08-13 13:48:39 -07:00 committed by David S. Miller
parent c1e24df27f
commit 3e8a0a559c
1 changed files with 5 additions and 0 deletions
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5
net/dccp/proto.c
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@ -474,6 +474,11 @@ static int dccp_setsockopt_change(struct sock *sk, int type,
if (copy_from_user(&opt, optval, sizeof(opt))) if (copy_from_user(&opt, optval, sizeof(opt)))
return -EFAULT; return -EFAULT;
/*
* rfc4340: 6.1. Change Options
*/
if (opt.dccpsf_len < 1)
return -EINVAL;
val = kmalloc(opt.dccpsf_len, GFP_KERNEL); val = kmalloc(opt.dccpsf_len, GFP_KERNEL);
if (!val) if (!val)