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Date: Mon, 15 Sep 2014 15:07:00 -0700 From: Kamal Mostafa <kamal@...onical.com> To: linux-kernel@...r.kernel.org, stable@...r.kernel.org, kernel-team@...ts.ubuntu.com Cc: Sasha Levin <sasha.levin@...cle.com>, "David S. Miller" <davem@...emloft.net>, Kamal Mostafa <kamal@...onical.com> Subject: [PATCH 3.13 010/187] iovec: make sure the caller actually wants anything in memcpy_fromiovecend 3.13.11.7 -stable review patch. If anyone has any objections, please let me know. ------------------ From: Sasha Levin <sasha.levin@...cle.com> [ Upstream commit 06ebb06d49486676272a3c030bfeef4bd969a8e6 ] Check for cases when the caller requests 0 bytes instead of running off and dereferencing potentially invalid iovecs. Signed-off-by: Sasha Levin <sasha.levin@...cle.com> Signed-off-by: David S. Miller <davem@...emloft.net> Signed-off-by: Kamal Mostafa <kamal@...onical.com> --- net/core/iovec.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/net/core/iovec.c b/net/core/iovec.c index a9c46ba..26dc006 100644 --- a/net/core/iovec.c +++ b/net/core/iovec.c @@ -107,6 +107,10 @@ EXPORT_SYMBOL(memcpy_toiovecend); int memcpy_fromiovecend(unsigned char *kdata, const struct iovec *iov, int offset, int len) { + /* No data? Done! */ + if (len == 0) + return 0; + /* Skip over the finished iovecs */ while (offset >= iov->iov_len) { offset -= iov->iov_len; -- 1.9.1 -- 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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