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Message-Id: <028246D6-9024-4E43-93A1-25A87878CBBC@gmail.com> Date: Tue, 22 Nov 2011 20:55:30 -0500 From: Xi Wang <xi.wang@...il.com> To: linux-kernel@...r.kernel.org Cc: Vlad Yasevich <vladislav.yasevich@...com>, Sridhar Samudrala <sri@...ibm.com>, "David S. Miller" <davem@...emloft.net>, linux-sctp@...r.kernel.org, netdev@...r.kernel.org, security@...nel.org Subject: [PATCH] sctp: integer overflow in sctp_auth_create_key() The previous commit 30c2235c is incomplete and cannot prevent integer overflows. For example, when key_len is 0x80000000 (INT_MAX + 1), the left-hand side of the check, (INT_MAX - key_len), which is unsigned, becomes 0xffffffff (UINT_MAX) and bypasses the check. Signed-off-by: Xi Wang <xi.wang@...il.com> --- net/sctp/auth.c | 2 +- 1 files changed, 1 insertions(+), 1 deletions(-) diff --git a/net/sctp/auth.c b/net/sctp/auth.c index 865e68f..989e0fd 100644 --- a/net/sctp/auth.c +++ b/net/sctp/auth.c @@ -82,7 +82,7 @@ static struct sctp_auth_bytes *sctp_auth_create_key(__u32 key_len, gfp_t gfp) struct sctp_auth_bytes *key; /* Verify that we are not going to overflow INT_MAX */ - if ((INT_MAX - key_len) < sizeof(struct sctp_auth_bytes)) + if (key_len > INT_MAX - sizeof(struct sctp_auth_bytes)) return NULL; /* Allocate the shared key */ -- 1.7.5.4 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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