[PATCH 1/2] IB/core: Use memdup_user() rather than duplicating its implementation

SF Markus Elfring
2016-08-21T17:42:11Z

Date: Sun, 21 Aug 2016 18:45:22 +0200

Reuse existing functionality from memdup_user() instead of keeping
duplicate source code.

This issue was detected by using the Coccinelle software.

Signed-off-by: Markus Elfring <elfring@users.sourceforge.net>
---
include/rdma/ib_verbs.h | 9 ++-------
1 file changed, 2 insertions(+), 7 deletions(-)

diff --git a/include/rdma/ib_verbs.h b/include/rdma/ib_verbs.h
index 6f667dd..033610b 100644
--- a/include/rdma/ib_verbs.h
+++ b/include/rdma/ib_verbs.h
@@ -2205,16 +2205,11 @@ static inline bool ib_is_udata_cleared(struct ib_udata *udata,
if (len > USHRT_MAX)
return false;

- buf = kmalloc(len, GFP_KERNEL);
- if (!buf)
+ buf = memdup_user(p, len);
+ if (IS_ERR(buf))
return false;

- if (copy_from_user(buf, p, len))
- goto free;
-
ret = !memchr_inv(buf, 0, len);
-
-free:
kfree(buf);
return ret;
}
--
2.9.3