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From: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To: linux-kernel@vger.kernel.org
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
	stable@vger.kernel.org, Aurelien Aptel <aaptel@suse.com>,
	Ronnie Sahlberg <lsahlber@redhat.com>,
	Steve French <stfrench@microsoft.com>
Subject: [PATCH 4.9 05/36] cifs: fix memory leak in smb2_copychunk_range
Date: Mon, 24 May 2021 17:24:50 +0200	[thread overview]
Message-ID: <20210524152324.340206658@linuxfoundation.org> (raw)
In-Reply-To: <20210524152324.158146731@linuxfoundation.org>

From: Ronnie Sahlberg <lsahlber@redhat.com>

commit d201d7631ca170b038e7f8921120d05eec70d7c5 upstream.

When using smb2_copychunk_range() for large ranges we will
run through several iterations of a loop calling SMB2_ioctl()
but never actually free the returned buffer except for the final
iteration.
This leads to memory leaks everytime a large copychunk is requested.

Fixes: 9bf0c9cd4314 ("CIFS: Fix SMB2/SMB3 Copy offload support (refcopy) for large files")
Cc: <stable@vger.kernel.org>
Reviewed-by: Aurelien Aptel <aaptel@suse.com>
Signed-off-by: Ronnie Sahlberg <lsahlber@redhat.com>
Signed-off-by: Steve French <stfrench@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 fs/cifs/smb2ops.c |    2 ++
 1 file changed, 2 insertions(+)

--- a/fs/cifs/smb2ops.c
+++ b/fs/cifs/smb2ops.c
@@ -629,6 +629,8 @@ smb2_clone_range(const unsigned int xid,
 			cpu_to_le32(min_t(u32, len, tcon->max_bytes_chunk));
 
 		/* Request server copy to target from src identified by key */
+		kfree(retbuf);
+		retbuf = NULL;
 		rc = SMB2_ioctl(xid, tcon, trgtfile->fid.persistent_fid,
 			trgtfile->fid.volatile_fid, FSCTL_SRV_COPYCHUNK_WRITE,
 			true /* is_fsctl */, (char *)pcchunk,



  parent reply	other threads:[~2021-05-24 15:36 UTC|newest]

Thread overview: 41+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-05-24 15:24 [PATCH 4.9 00/36] 4.9.270-rc1 review Greg Kroah-Hartman
2021-05-24 15:24 ` [PATCH 4.9 01/36] openrisc: Fix a memory leak Greg Kroah-Hartman
2021-05-24 15:24 ` [PATCH 4.9 02/36] RDMA/rxe: Clear all QP fields if creation failed Greg Kroah-Hartman
2021-05-24 15:24 ` [PATCH 4.9 03/36] scsi: qla2xxx: Fix error return code in qla82xx_write_flash_dword() Greg Kroah-Hartman
2021-05-24 15:24 ` [PATCH 4.9 04/36] ptrace: make ptrace() fail if the tracee changed its pid unexpectedly Greg Kroah-Hartman
2021-05-24 15:24 ` Greg Kroah-Hartman [this message]
2021-05-24 15:24 ` [PATCH 4.9 06/36] ALSA: line6: Fix racy initialization of LINE6 MIDI Greg Kroah-Hartman
2021-05-24 15:24 ` [PATCH 4.9 07/36] ALSA: usb-audio: Validate MS endpoint descriptors Greg Kroah-Hartman
2021-05-24 15:24 ` [PATCH 4.9 08/36] ALSA: bebob/oxfw: fix Kconfig entry for Mackie d.2 Pro Greg Kroah-Hartman
2021-05-24 15:24 ` [PATCH 4.9 09/36] Revert "ALSA: sb8: add a check for request_region" Greg Kroah-Hartman
2021-05-24 15:24 ` [PATCH 4.9 10/36] Revert "rapidio: fix a NULL pointer dereference when create_workqueue() fails" Greg Kroah-Hartman
2021-05-24 15:24 ` [PATCH 4.9 11/36] rapidio: handle create_workqueue() failure Greg Kroah-Hartman
2021-05-24 15:24 ` [PATCH 4.9 12/36] xen-pciback: reconfigure also from backend watch handler Greg Kroah-Hartman
2021-05-24 15:24 ` [PATCH 4.9 13/36] dm snapshot: fix a crash when an origin has no snapshots Greg Kroah-Hartman
2021-05-24 15:24 ` [PATCH 4.9 14/36] dm snapshot: fix crash with transient storage and zero chunk size Greg Kroah-Hartman
2021-05-24 15:25 ` [PATCH 4.9 15/36] Revert "video: hgafb: fix potential NULL pointer dereference" Greg Kroah-Hartman
2021-05-24 15:25 ` [PATCH 4.9 16/36] Revert "net: stmicro: fix a missing check of clk_prepare" Greg Kroah-Hartman
2021-05-24 15:25 ` [PATCH 4.9 17/36] Revert "leds: lp5523: fix a missing check of return value of lp55xx_read" Greg Kroah-Hartman
2021-05-24 15:25 ` [PATCH 4.9 18/36] Revert "hwmon: (lm80) fix a missing check of bus read in lm80 probe" Greg Kroah-Hartman
2021-05-24 15:25 ` [PATCH 4.9 19/36] Revert "video: imsttfb: fix potential NULL pointer dereferences" Greg Kroah-Hartman
2021-05-24 15:25 ` [PATCH 4.9 20/36] Revert "ecryptfs: replace BUG_ON with error handling code" Greg Kroah-Hartman
2021-05-24 15:25 ` [PATCH 4.9 21/36] Revert "gdrom: fix a memory leak bug" Greg Kroah-Hartman
2021-05-24 15:25 ` [PATCH 4.9 22/36] cdrom: gdrom: deallocate struct gdrom_unit fields in remove_gdrom Greg Kroah-Hartman
2021-05-24 15:25 ` [PATCH 4.9 23/36] cdrom: gdrom: initialize global variable at init time Greg Kroah-Hartman
2021-05-24 15:25 ` [PATCH 4.9 24/36] Revert "rtlwifi: fix a potential NULL pointer dereference" Greg Kroah-Hartman
2021-05-24 15:25 ` [PATCH 4.9 25/36] Revert "qlcnic: Avoid " Greg Kroah-Hartman
2021-05-24 15:25 ` [PATCH 4.9 26/36] Revert "niu: fix missing checks of niu_pci_eeprom_read" Greg Kroah-Hartman
2021-05-24 15:25 ` [PATCH 4.9 27/36] ethernet: sun: niu: fix missing checks of niu_pci_eeprom_read() Greg Kroah-Hartman
2021-05-24 15:25 ` [PATCH 4.9 28/36] net: stmicro: handle clk_prepare() failure during init Greg Kroah-Hartman
2021-05-24 15:25 ` [PATCH 4.9 29/36] net: rtlwifi: properly check for alloc_workqueue() failure Greg Kroah-Hartman
2021-05-24 15:25 ` [PATCH 4.9 30/36] leds: lp5523: check return value of lp5xx_read and jump to cleanup code Greg Kroah-Hartman
2021-05-24 15:25 ` [PATCH 4.9 31/36] qlcnic: Add null check after calling netdev_alloc_skb Greg Kroah-Hartman
2021-05-24 15:25 ` [PATCH 4.9 32/36] video: hgafb: fix potential NULL pointer dereference Greg Kroah-Hartman
2021-05-24 15:25 ` [PATCH 4.9 33/36] vgacon: Record video mode changes with VT_RESIZEX Greg Kroah-Hartman
2021-05-24 15:25 ` [PATCH 4.9 34/36] vt: Fix character height handling " Greg Kroah-Hartman
2021-05-24 15:25 ` [PATCH 4.9 35/36] tty: vt: always invoke vc->vc_sw->con_resize callback Greg Kroah-Hartman
2021-05-24 15:25 ` [PATCH 4.9 36/36] iio: tsl2583: Fix division by a zero lux_val Greg Kroah-Hartman
2021-05-24 22:26 ` [PATCH 4.9 00/36] 4.9.270-rc1 review Florian Fainelli
2021-05-25  0:19 ` Shuah Khan
2021-05-25 12:26 ` Naresh Kamboju
2021-05-25 21:22 ` Guenter Roeck

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