[PATCH] bnx2x: Fix mem leak in bnx2x_tpa_stop() if build_skb()fails.

From: Jesper Juhl
Date: Mon Feb 06 2012 - 16:27:49 EST

We allocate memory for 'new_data' with kmalloc(). If we get the memory
we then try to build_skb() and if that should fail (which it can) we
do not enter 'if (likely(skb)) {' and actually use 'new_data' but
instead fall through to the 'drop:' label and end up returning from
the function without ever assigning 'new'data' to anything or freeing
it. That leaks the memory allocated to 'new_data'.

This patch fixes the memory leak by doing a kfree(new_data) in the
case where build_skb() fails (or where allocation of 'new_data' itself
fails, but in taht case it's just a harmless kfree(NULL)).

Signed-off-by: Jesper Juhl <jj@xxxxxxxxxxxxx>
drivers/net/ethernet/broadcom/bnx2x/bnx2x_cmn.c | 3 +--
1 files changed, 1 insertions(+), 2 deletions(-)

No hardware to test, so compile tested only.

diff --git a/drivers/net/ethernet/broadcom/bnx2x/bnx2x_cmn.c b/drivers/net/ethernet/broadcom/bnx2x/bnx2x_cmn.c
index 03f3935..7aee469 100644
--- a/drivers/net/ethernet/broadcom/bnx2x/bnx2x_cmn.c
+++ b/drivers/net/ethernet/broadcom/bnx2x/bnx2x_cmn.c
@@ -523,7 +523,6 @@ static void bnx2x_tpa_stop(struct bnx2x *bp, struct bnx2x_fastpath *fp,
skb = build_skb(data);

if (likely(skb)) {
if (pad + len > fp->rx_buf_size) {
BNX2X_ERR("skb_put is about to fail... "
@@ -557,7 +556,7 @@ static void bnx2x_tpa_stop(struct bnx2x *bp, struct bnx2x_fastpath *fp,

+ kfree(new_data);
/* drop the packet and keep the buffer in the bin */

Jesper Juhl <jj@xxxxxxxxxxxxx> http://www.chaosbits.net/
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