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.
Signed-off-by: Guenter Roeck <linux@xxxxxxxxxxxx>
---
net/sctp/socket.c | 2 ++
1 file changed, 2 insertions(+)
diff --git a/net/sctp/socket.c b/net/sctp/socket.c
index cedd9bf..0a5f2bf 100644
--- a/net/sctp/socket.c
+++ b/net/sctp/socket.c
@@ -5652,6 +5652,8 @@ static int sctp_getsockopt_assoc_stats(struct sock *sk, int len,
/* User must provide at least the assoc id */
if (len < sizeof(sctp_assoc_t))
return -EINVAL;
+ if (len > sizeof(struct sctp_assoc_stats))
+ len = sizeof(struct sctp_assoc_stats);
if (copy_from_user(&sas, optval, len))
return -EFAULT;
--
1.7.9.7
--
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