Hi,
Please include (Greg Smith <greg@xxxxxxxxx>) into any communication.
Greg Smith from CED noticed that there is no kfree, causing a memory
leak, and memset() has been removed, thus tx->used was not cleared.
The patch below should fix this.
Alois
diff --git a/ced_ioc.c b/ced_ioc.c
index 4a13c10..fe15c44 100644
--- a/ced_ioc.c
+++ b/ced_ioc.c
@@ -895,15 +895,23 @@ int GetTransfer(DEVICE_EXTENSION *pdx,
TGET_TX_BLOCK __user *pTX)
else
{
// Return the best information we have - we don't have
physical addresses
- TGET_TX_BLOCK tx;
- memset(&tx, 0, sizeof(tx)); // clean out local work
structure
- tx.size = pdx->rTransDef[dwIdent].dwLength;
- tx.linear = (long long)((long)pdx->rTransDef[dwIdent].lpvBuff);
- tx.avail = GET_TX_MAXENTRIES; // how many blocks we could
return
- tx.used = 1; // number we actually return
- tx.entries[0].physical = (long long)(tx.linear+pdx->StagedOffset);
- tx.entries[0].size = tx.size;
- copy_to_user(pTX, &tx, sizeof(tx));
+ TGET_TX_BLOCK *tx;
+ tx = kzalloc(sizeof(*tx), GFP_KERNEL);
+ if (!tx) {
+ mutex_unlock(&pdx->io_mutex);
+ return -ENOMEM;
+ }
+
+ memset(tx, 0, sizeof(*tx)); // clean out local work
structure
+ tx->size = pdx->rTransDef[dwIdent].dwLength;
+ tx->linear = (long long)((long)pdx->rTransDef[dwIdent].lpvBuff);
+ tx->avail = GET_TX_MAXENTRIES; // how many blocks we
could return
+ tx->used = 1; // number we actually return
+ tx->entries[0].physical = (long
long)(tx->linear+pdx->StagedOffset);
+ tx->entries[0].size = tx->size;
+ iReturn = copy_to_user(pTX, tx, sizeof(*tx));
+ kfree(tx);
+ return (iReturn);
}
mutex_unlock(&pdx->io_mutex);
return iReturn;
On 10/07/2012 02:56 PM, devendra.aaru wrote:
Hi, Fengguang,
On Sun, Oct 7, 2012 at 7:07 AM, Fengguang Wu<fengguang.wu@xxxxxxxxx> wrote:
Hi Alois,
FYI, there are new smatch warnings show up in
tree: git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/staging.git staging-next
head: e1878957b4676a17cf398f7f5723b365e9a2ca48
commit: 2eae6bdc12f4e49b7f94f032b82d664dcf3881bc [115/274] Staging: add ced1401 USB driver
+ drivers/staging/ced1401/ced_ioc.c:898 GetTransfer() warn: 'tx' puts 3104 bytes on stack
I have a following patch to send to Greg, when the merge window closes:
From 7d9b8485ab837bf9e0f960d090f90c6518f7e2db Mon Sep 17 00:00:00 2001
From: Devendra Naga<devendra.aaru@xxxxxxxxx>
Date: Sat, 6 Oct 2012 02:57:42 -0400
Subject: [PATCH 1/4] staging: ced1401: fix a frame size warning
gcc/sparse complain about the following:
drivers/staging/ced1401/ced_ioc.c:931:1: warning: the frame size of
4144 bytes is larger than 2048 bytes [-Wframe-larger-than=]
fix it by using a pointer of the TGET_TX_BLOCK struct
Signed-off-by: Devendra Naga<devendra.aaru@xxxxxxxxx>
---
drivers/staging/ced1401/ced_ioc.c | 28 +++++++++++++++++-----------
1 file changed, 17 insertions(+), 11 deletions(-)
diff --git a/drivers/staging/ced1401/ced_ioc.c
b/drivers/staging/ced1401/ced_ioc.c
index c9492ed..a136ca3 100644
--- a/drivers/staging/ced1401/ced_ioc.c
+++ b/drivers/staging/ced1401/ced_ioc.c
@@ -913,17 +913,23 @@ int GetTransfer(DEVICE_EXTENSION * pdx,
TGET_TX_BLOCK __user * pTX)
iReturn = U14ERR_BADAREA;
else {
// Return the best information we have - we don't have
physical addresses
- TGET_TX_BLOCK tx;
- memset(&tx, 0, sizeof(tx)); // clean out local
work structure
- tx.size = pdx->rTransDef[dwIdent].dwLength;
- tx.linear = (long long)((long)pdx->rTransDef[dwIdent].lpvBuff);
- tx.avail = GET_TX_MAXENTRIES; // how many blocks we
could return
- tx.used = 1; // number we actually return
- tx.entries[0].physical =
- (long long)(tx.linear + pdx->StagedOffset);
- tx.entries[0].size = tx.size;
-
- if (copy_to_user(pTX,&tx, sizeof(tx)))
+ TGET_TX_BLOCK *tx;
+
+ tx = kzalloc(sizeof(*tx), GFP_KERNEL);
+ if (!tx) {
+ mutex_unlock(&pdx->io_mutex);
+ return -ENOMEM;
+ }
+
+ tx->size = pdx->rTransDef[dwIdent].dwLength;
+ tx->linear = (long long)((long)pdx->rTransDef[dwIdent].lpvBuff);
+ tx->avail = GET_TX_MAXENTRIES; // how many blocks we
could return
+ tx->used = 1; // number we actually return
+ tx->entries[0].physical =
+ (long long)(tx->linear + pdx->StagedOffset);
+ tx->entries[0].size = tx->size;
+
+ if (copy_to_user(pTX, tx, sizeof(*tx)))
iReturn = -EFAULT;
}
mutex_unlock(&pdx->io_mutex);
0-DAY kernel build testing backend Open Source Technology Center
Fengguang Wu, Yuanhan Liu Intel Corporation
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Thanks,
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