[ 56/75] net/sctp: Validate parameter size for SCTP_GET_ASSOC_STATS
From: Greg Kroah-Hartman
Date: Mon Mar 18 2013 - 17:50:55 EST
3.8-stable review patch. If anyone has any objections, please let me know.
------------------
From: Guenter Roeck <linux@xxxxxxxxxxxx>
commit 726bc6b092da4c093eb74d13c07184b18c1af0f1 upstream.
Building sctp may fail with:
In function âcopy_from_userâ,
inlined from âsctp_getsockopt_assoc_statsâ at
net/sctp/socket.c:5656:20:
arch/x86/include/asm/uaccess_32.h:211:26: error: call to
âcopy_from_user_overflowâ 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@xxxxxxxxxxxx>
Acked-by: Vlad Yasevich <vyasevich@xxxxxxxxx>
Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
net/sctp/socket.c | 6 +++---
1 file changed, 3 insertions(+), 3 deletions(-)
--- a/net/sctp/socket.c
+++ b/net/sctp/socket.c
@@ -5653,6 +5653,9 @@ static int sctp_getsockopt_assoc_stats(s
if (len < sizeof(sctp_assoc_t))
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))
return -EFAULT;
@@ -5686,9 +5689,6 @@ static int sctp_getsockopt_assoc_stats(s
/* Mark beginning of a new observation period */
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))
return -EFAULT;
--
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