This is a note to let you know that I've just added the patch titled
firestream: fix memory leaks
to the 4.4-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
firestream-fix-memory-leaks.patch
and it can be found in the queue-4.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From foo@baz Mon 27 Jan 2020 04:14:17 PM CET
From: Wenwen Wang <wenwen@xxxxxxxxxx>
Date: Sat, 25 Jan 2020 14:33:29 +0000
Subject: firestream: fix memory leaks
From: Wenwen Wang <wenwen@xxxxxxxxxx>
[ Upstream commit fa865ba183d61c1ec8cbcab8573159c3b72b89a4 ]
In fs_open(), 'vcc' is allocated through kmalloc() and assigned to
'atm_vcc->dev_data.' In the following execution, if an error occurs, e.g.,
there is no more free channel, an error code EBUSY or ENOMEM will be
returned. However, 'vcc' is not deallocated, leading to memory leaks. Note
that, in normal cases where fs_open() returns 0, 'vcc' will be deallocated
in fs_close(). But, if fs_open() fails, there is no guarantee that
fs_close() will be invoked.
To fix this issue, deallocate 'vcc' before the error code is returned.
Signed-off-by: Wenwen Wang <wenwen@xxxxxxxxxx>
Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/atm/firestream.c | 3 +++
1 file changed, 3 insertions(+)
--- a/drivers/atm/firestream.c
+++ b/drivers/atm/firestream.c
@@ -923,6 +923,7 @@ static int fs_open(struct atm_vcc *atm_v
}
if (!to) {
printk ("No more free channels for FS50..\n");
+ kfree(vcc);
return -EBUSY;
}
vcc->channo = dev->channo;
@@ -933,6 +934,7 @@ static int fs_open(struct atm_vcc *atm_v
if (((DO_DIRECTION(rxtp) && dev->atm_vccs[vcc->channo])) ||
( DO_DIRECTION(txtp) && test_bit (vcc->channo, dev->tx_inuse))) {
printk ("Channel is in use for FS155.\n");
+ kfree(vcc);
return -EBUSY;
}
}
@@ -946,6 +948,7 @@ static int fs_open(struct atm_vcc *atm_v
tc, sizeof (struct fs_transmit_config));
if (!tc) {
fs_dprintk (FS_DEBUG_OPEN, "fs: can't alloc transmit_config.\n");
+ kfree(vcc);
return -ENOMEM;
}
Patches currently in stable-queue which might be from wenwen@xxxxxxxxxx are
queue-4.4/firestream-fix-memory-leaks.patch
