Check for cases when the caller requests 0 bytes instead of running off
and dereferencing potentially invalid iovecs.
Signed-off-by: Sasha Levin <sasha.le...@oracle.com>
---
lib/iovec.c | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/lib/iovec.c b/lib/iovec.c
index 7a7c2da..df3abd1 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;
--
1.7.10.4
--
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