[PATCH 2/7] aacraid: One function call less in aac_send_raw_srb() after error detection

SF Markus Elfring
2016-08-21T07:21:06Z

>From e8187662ee30aab709a260c72fb86c51673f8e0d Mon Sep 17 00:00:00 2001
From: Markus Elfring <elfring@users.sourceforge.net>
Date: Sat, 20 Aug 2016 20:40:47 +0200
Subject: [PATCH 2/7] aacraid: One function call less in aac_send_raw_srb()
after error detection

The kfree() function was called in a few cases by the
aac_send_raw_srb() function during error handling
even if the variable "user_srbcmd" contained eventually
an inappropriate pointer value.

Signed-off-by: Markus Elfring <elfring@users.sourceforge.net>
---
drivers/scsi/aacraid/commctrl.c | 49 ++++++++++++++++++++---------------------
1 file changed, 24 insertions(+), 25 deletions(-)

diff --git a/drivers/scsi/aacraid/commctrl.c b/drivers/scsi/aacraid/commctrl.c
index 1af3084..6dcdf91 100644
--- a/drivers/scsi/aacraid/commctrl.c
+++ b/drivers/scsi/aacraid/commctrl.c
@@ -517,19 +517,19 @@ static int aac_send_raw_srb(struct aac_dev* dev, void __user * arg)
if(copy_from_user(&fibsize, &user_srb->count,sizeof(u32))){
dprintk((KERN_DEBUG"aacraid: Could not copy data size from user\n"));
rcode = -EFAULT;
- goto cleanup;
+ goto free_sg_list;
}

if ((fibsize < (sizeof(struct user_aac_srb) - sizeof(struct user_sgentry))) ||
(fibsize > (dev->max_fib_size - sizeof(struct aac_fibhdr)))) {
rcode = -EINVAL;
- goto cleanup;
+ goto free_sg_list;
}

user_srbcmd = memdup_user(user_srb, fibsize);
if (IS_ERR(user_srbcmd)) {
rcode = PTR_ERR(user_srbcmd);
- goto cleanup;
+ goto free_sg_list;
}

user_reply = arg+fibsize;
@@ -564,7 +564,7 @@ static int aac_send_raw_srb(struct aac_dev* dev, void __user * arg)
dprintk((KERN_DEBUG"aacraid: too many sg entries %d\n",
le32_to_cpu(srbcmd->sg.count)));
rcode = -EINVAL;
- goto cleanup;
+ goto free_user_srbcmd;
}
actual_fibsize = sizeof(struct aac_srb) - sizeof(struct sgentry) +
((user_srbcmd->sg.count & 0xff) * sizeof(struct sgentry));
@@ -580,12 +580,12 @@ static int aac_send_raw_srb(struct aac_dev* dev, void __user * arg)
sizeof(struct aac_srb), sizeof(struct sgentry),
sizeof(struct sgentry64), fibsize));
rcode = -EINVAL;
- goto cleanup;
+ goto free_user_srbcmd;
}
if ((data_dir == DMA_NONE) && user_srbcmd->sg.count) {
dprintk((KERN_DEBUG"aacraid: SG with no direction specified in Raw SRB command\n"));
rcode = -EINVAL;
- goto cleanup;
+ goto free_user_srbcmd;
}
byte_count = 0;
if (dev->adapter_info.options & AAC_OPT_SGMAP_HOST64) {
@@ -606,7 +606,7 @@ static int aac_send_raw_srb(struct aac_dev* dev, void __user * arg)
(dev->scsi_host_ptr->max_sectors << 9) :
65536)) {
rcode = -EINVAL;
- goto cleanup;
+ goto free_user_srbcmd;
}
/* Does this really need to be GFP_DMA? */
p = kmalloc(upsg->sg[i].count,GFP_KERNEL|__GFP_DMA);
@@ -614,7 +614,7 @@ static int aac_send_raw_srb(struct aac_dev* dev, void __user * arg)
dprintk((KERN_DEBUG"aacraid: Could not allocate SG buffer - size = %d buffer number %d of %d\n",
upsg->sg[i].count,i,upsg->count));
rcode = -ENOMEM;
- goto cleanup;
+ goto free_user_srbcmd;
}
addr = (u64)upsg->sg[i].addr[0];
addr += ((u64)upsg->sg[i].addr[1]) << 32;
@@ -626,7 +626,7 @@ static int aac_send_raw_srb(struct aac_dev* dev, void __user * arg)
if(copy_from_user(p,sg_user[i],upsg->sg[i].count)){
dprintk((KERN_DEBUG"aacraid: Could not copy sg data from user\n"));
rcode = -EFAULT;
- goto cleanup;
+ goto free_user_srbcmd;
}
}
addr = pci_map_single(dev->pdev, p, upsg->sg[i].count, data_dir);
@@ -644,7 +644,7 @@ static int aac_send_raw_srb(struct aac_dev* dev, void __user * arg)
if (!usg) {
dprintk((KERN_DEBUG"aacraid: Allocation error in Raw SRB command\n"));
rcode = -ENOMEM;
- goto cleanup;
+ goto free_user_srbcmd;
}
actual_fibsize = actual_fibsize64;

@@ -658,7 +658,7 @@ static int aac_send_raw_srb(struct aac_dev* dev, void __user * arg)
65536)) {
kfree(usg);
rcode = -EINVAL;
- goto cleanup;
+ goto free_user_srbcmd;
}
/* Does this really need to be GFP_DMA? */
p = kmalloc(usg->sg[i].count,GFP_KERNEL|__GFP_DMA);
@@ -667,7 +667,7 @@ static int aac_send_raw_srb(struct aac_dev* dev, void __user * arg)
usg->sg[i].count,i,usg->count));
kfree(usg);
rcode = -ENOMEM;
- goto cleanup;
+ goto free_user_srbcmd;
}
sg_user[i] = (void __user *)(uintptr_t)usg->sg[i].addr;
sg_list[i] = p; // save so we can clean up later
@@ -678,7 +678,7 @@ static int aac_send_raw_srb(struct aac_dev* dev, void __user * arg)
kfree (usg);
dprintk((KERN_DEBUG"aacraid: Could not copy sg data from user\n"));
rcode = -EFAULT;
- goto cleanup;
+ goto free_user_srbcmd;
}
}
addr = pci_map_single(dev->pdev, p, usg->sg[i].count, data_dir);
@@ -711,7 +711,7 @@ static int aac_send_raw_srb(struct aac_dev* dev, void __user * arg)
(dev->scsi_host_ptr->max_sectors << 9) :
65536)) {
rcode = -EINVAL;
- goto cleanup;
+ goto free_user_srbcmd;
}
/* Does this really need to be GFP_DMA? */
p = kmalloc(usg->sg[i].count,GFP_KERNEL|__GFP_DMA);
@@ -719,7 +719,7 @@ static int aac_send_raw_srb(struct aac_dev* dev, void __user * arg)
dprintk((KERN_DEBUG"aacraid: Could not allocate SG buffer - size = %d buffer number %d of %d\n",
usg->sg[i].count,i,usg->count));
rcode = -ENOMEM;
- goto cleanup;
+ goto free_user_srbcmd;
}
addr = (u64)usg->sg[i].addr[0];
addr += ((u64)usg->sg[i].addr[1]) << 32;
@@ -731,7 +731,7 @@ static int aac_send_raw_srb(struct aac_dev* dev, void __user * arg)
if(copy_from_user(p,sg_user[i],usg->sg[i].count)){
dprintk((KERN_DEBUG"aacraid: Could not copy sg data from user\n"));
rcode = -EFAULT;
- goto cleanup;
+ goto free_user_srbcmd;
}
}
addr = pci_map_single(dev->pdev, p, usg->sg[i].count, data_dir);
@@ -750,14 +750,14 @@ static int aac_send_raw_srb(struct aac_dev* dev, void __user * arg)
(dev->scsi_host_ptr->max_sectors << 9) :
65536)) {
rcode = -EINVAL;
- goto cleanup;
+ goto free_user_srbcmd;
}
p = kmalloc(upsg->sg[i].count, GFP_KERNEL);
if (!p) {
dprintk((KERN_DEBUG"aacraid: Could not allocate SG buffer - size = %d buffer number %d of %d\n",
upsg->sg[i].count, i, upsg->count));
rcode = -ENOMEM;
- goto cleanup;
+ goto free_user_srbcmd;
}
sg_user[i] = (void __user *)(uintptr_t)upsg->sg[i].addr;
sg_list[i] = p; // save so we can clean up later
@@ -768,7 +768,7 @@ static int aac_send_raw_srb(struct aac_dev* dev, void __user * arg)
upsg->sg[i].count)) {
dprintk((KERN_DEBUG"aacraid: Could not copy sg data from user\n"));
rcode = -EFAULT;
- goto cleanup;
+ goto free_user_srbcmd;
}
}
addr = pci_map_single(dev->pdev, p,
@@ -788,13 +788,13 @@ static int aac_send_raw_srb(struct aac_dev* dev, void __user * arg)
}
if (status == -ERESTARTSYS) {
rcode = -ERESTARTSYS;
- goto cleanup;
+ goto free_user_srbcmd;
}

if (status != 0){
dprintk((KERN_DEBUG"aacraid: Could not send raw srb fib to hba\n"));
rcode = -ENXIO;
- goto cleanup;
+ goto free_user_srbcmd;
}

if (flags & SRB_DataIn) {
@@ -806,7 +806,7 @@ static int aac_send_raw_srb(struct aac_dev* dev, void __user * arg)
if(copy_to_user(sg_user[i], sg_list[i], byte_count)){
dprintk((KERN_DEBUG"aacraid: Could not copy sg data to user\n"));
rcode = -EFAULT;
- goto cleanup;
+ goto free_user_srbcmd;

}
}
@@ -816,11 +816,10 @@ static int aac_send_raw_srb(struct aac_dev* dev, void __user * arg)
if(copy_to_user(user_reply,reply,sizeof(struct aac_srb_reply))){
dprintk((KERN_DEBUG"aacraid: Could not copy reply to user\n"));
rcode = -EFAULT;
- goto cleanup;
}
-
-cleanup:
+free_user_srbcmd:
kfree(user_srbcmd);
+free_sg_list:
for(i=0; i <= sg_indx; i++){
kfree(sg_list[i]);
}
--
2.9.3