[PATCH] net/smc: Fix preinitialization of buf_desc in __smc_buf_create()

From: Geert Uytterhoeven
Date: Thu Nov 16 2017 - 06:23:12 EST

With gcc-4.1.2:

net/smc/smc_core.c: In function â__smc_buf_createâ:
net/smc/smc_core.c:567: warning: âbufsizeâ may be used uninitialized in this function

Indeed, if the for-loop is never executed, bufsize is used
uninitialized. In addition, buf_desc is stored for later use, while it
is still a NULL pointer.

Before, error handling was done by checking if buf_desc is non-NULL.
The cleanup changed this to an error check, but forgot to update the
preinitialization of buf_desc to an error pointer.

Update the preinitializatin of buf_desc to fix this.

Fixes: b33982c3a6838d13 ("net/smc: cleanup function __smc_buf_create()")
Signed-off-by: Geert Uytterhoeven <geert@xxxxxxxxxxxxxx>
I don't know if this can ever happen, but the old code handled it.
net/smc/smc_core.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/net/smc/smc_core.c b/net/smc/smc_core.c
index 2578fbd95664af84..453c54467082d93f 100644
--- a/net/smc/smc_core.c
+++ b/net/smc/smc_core.c
@@ -562,7 +562,7 @@ static int __smc_buf_create(struct smc_sock *smc, bool is_rmb)
struct smc_connection *conn = &smc->conn;
struct smc_link_group *lgr = conn->lgr;
- struct smc_buf_desc *buf_desc = NULL;
+ struct smc_buf_desc *buf_desc = ERR_PTR(-ENOMEM);
struct list_head *buf_list;
int bufsize, bufsize_short;
int sk_buf_size;