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| author | Sasha Levin <sasha.levin@oracle.com> | 2014-07-31 23:00:35 -0400 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2014-08-14 10:09:43 +0800 |
| commit | 874c613a476d6a283ce418290c4472a07dadadf6 (patch) | |
| tree | 4f294e74b148798f7ae4284ea591a4381700dbba | |
| parent | d2b999aca2407ed869df1b314bacce6253e01307 (diff) | |
iovec: make sure the caller actually wants anything in memcpy_fromiovecend
[ 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>
| -rw-r--r-- | lib/iovec.c | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/lib/iovec.c b/lib/iovec.c index 7a7c2da4cddf..df3abd1eaa4a 100644 --- a/lib/iovec.c +++ b/lib/iovec.c @@ -85,6 +85,10 @@ 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; |