Messages in this thread Patch in this message | | | From | Tim Gardner <> | Subject | [PATCH linux-next] SUNRPC: rpcrdma_register_default_external: Dynamically allocate ib_phys_buf | Date | Sun, 10 Mar 2013 09:39:13 -0600 |
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rpcrdma_register_default_external() is several frames into the call stack which goes deeper yet. You run the risk of stack corruption by declaring such a large automatic variable, so dynamically allocate the array of 'struct ib_phys_buf' objects in order to silence the frame-larger-than warning.
net/sunrpc/xprtrdma/verbs.c: In function 'rpcrdma_register_default_external': net/sunrpc/xprtrdma/verbs.c:1774:1: warning: the frame size of 1056 bytes is larger than 1024 bytes [-Wframe-larger-than=]
gcc version 4.6.3
Cc: Trond Myklebust <Trond.Myklebust@netapp.com> Cc: "J. Bruce Fields" <bfields@fieldses.org> Cc: "David S. Miller" <davem@davemloft.net> Cc: Tom Tucker <tom@ogc.us> Cc: Haggai Eran <haggaie@mellanox.com> Cc: Or Gerlitz <ogerlitz@mellanox.com> Cc: Shani Michaeli <shanim@mellanox.com> Cc: linux-nfs@vger.kernel.org Cc: netdev@vger.kernel.org Signed-off-by: Tim Gardner <tim.gardner@canonical.com> --- net/sunrpc/xprtrdma/verbs.c | 7 ++++++- 1 file changed, 6 insertions(+), 1 deletion(-)
diff --git a/net/sunrpc/xprtrdma/verbs.c b/net/sunrpc/xprtrdma/verbs.c index 93726560..0916467 100644 --- a/net/sunrpc/xprtrdma/verbs.c +++ b/net/sunrpc/xprtrdma/verbs.c @@ -1736,9 +1736,13 @@ rpcrdma_register_default_external(struct rpcrdma_mr_seg *seg, int mem_priv = (writing ? IB_ACCESS_REMOTE_WRITE : IB_ACCESS_REMOTE_READ); struct rpcrdma_mr_seg *seg1 = seg; - struct ib_phys_buf ipb[RPCRDMA_MAX_DATA_SEGS]; + struct ib_phys_buf *ipb; int len, i, rc = 0; + ipb = kmalloc(sizeof(*ipb) * RPCRDMA_MAX_DATA_SEGS, GFP_KERNEL); + if (!ipb) + return -ENOMEM; + if (*nsegs > RPCRDMA_MAX_DATA_SEGS) *nsegs = RPCRDMA_MAX_DATA_SEGS; for (len = 0, i = 0; i < *nsegs;) { @@ -1770,6 +1774,7 @@ rpcrdma_register_default_external(struct rpcrdma_mr_seg *seg, seg1->mr_len = len; } *nsegs = i; + kfree(ipb); return rc; } -- 1.7.9.5
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