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net/sctp: Validate parameter size for SCTP_GET_ASSOC_STATS 

Building sctp may fail with:

In function ‘copy_from_user’,
    inlined from ‘sctp_getsockopt_assoc_stats’ at
    net/sctp/socket.c:5656:20:
arch/x86/include/asm/uaccess_32.h:211:26: error: call to
    ‘copy_from_user_overflow’ declared with attribute error: copy_from_user()
    buffer size is not provably correct

if built with W=1 due to a missing parameter size validation
before the call to copy_from_user.

Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Acked-by: Vlad Yasevich <vyasevich@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Guenter Roeck 2013-02-27 10:57:31 +00:00 committed by David S. Miller
parent 45af3fb4a0
commit 726bc6b092
1 changed files with 3 additions and 3 deletions
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6
net/sctp/socket.c
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@ -5653,6 +5653,9 @@ static int sctp_getsockopt_assoc_stats(struct sock *sk, int len,
if (len < sizeof(sctp_assoc_t)) if (len < sizeof(sctp_assoc_t))
return -EINVAL; return -EINVAL;
/* Allow the struct to grow and fill in as much as possible */
len = min_t(size_t, len, sizeof(sas));
if (copy_from_user(&sas, optval, len)) if (copy_from_user(&sas, optval, len))
return -EFAULT; return -EFAULT;
@ -5686,9 +5689,6 @@ static int sctp_getsockopt_assoc_stats(struct sock *sk, int len,
/* Mark beginning of a new observation period */ /* Mark beginning of a new observation period */
asoc->stats.max_obs_rto = asoc->rto_min; asoc->stats.max_obs_rto = asoc->rto_min;
/* Allow the struct to grow and fill in as much as possible */
len = min_t(size_t, len, sizeof(sas));
if (put_user(len, optlen)) if (put_user(len, optlen))
return -EFAULT; return -EFAULT;