Messages in this thread Patch in this message | | | From | Greg Kroah-Hartman <> | Subject | [PATCH 3.4 09/23] iovec: make sure the caller actually wants anything in memcpy_fromiovecend | Date | Fri, 8 Aug 2014 14:34:54 -0700 |
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3.4-stable review patch. If anyone has any objections, please let me know.
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From: Sasha Levin <sasha.levin@oracle.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@oracle.com> Signed-off-by: David S. Miller <davem@davemloft.net> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> --- net/core/iovec.c | 4 ++++ 1 file changed, 4 insertions(+)
--- a/net/core/iovec.c +++ b/net/core/iovec.c @@ -157,6 +157,10 @@ EXPORT_SYMBOL(memcpy_fromiovec); 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;
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