From: Sasha Levin <sashal@kernel.org>
To: linux-kernel@vger.kernel.org, stable@vger.kernel.org
Cc: Bharath Vedartham <linux.bhar@gmail.com>,
syzbot+3a030a73b6c1e9833815@syzkaller.appspotmail.com,
Dominique Martinet <dominique.martinet@cea.fr>,
Sasha Levin <sashal@kernel.org>,
v9fs-developer@lists.sourceforge.net
Subject: [PATCH AUTOSEL 4.19 06/43] 9p/cache.c: Fix memory leak in v9fs_cache_session_get_cookie
Date: Tue, 1 Oct 2019 12:42:34 -0400 [thread overview]
Message-ID: <20191001164311.15993-6-sashal@kernel.org> (raw)
In-Reply-To: <20191001164311.15993-1-sashal@kernel.org>
From: Bharath Vedartham <linux.bhar@gmail.com>
[ Upstream commit 962a991c5de18452d6c429d99f3039387cf5cbb0 ]
v9fs_cache_session_get_cookie assigns a random cachetag to v9ses->cachetag,
if the cachetag is not assigned previously.
v9fs_random_cachetag allocates memory to v9ses->cachetag with kmalloc and uses
scnprintf to fill it up with a cachetag.
But if scnprintf fails, v9ses->cachetag is not freed in the current
code causing a memory leak.
Fix this by freeing v9ses->cachetag it v9fs_random_cachetag fails.
This was reported by syzbot, the link to the report is below:
https://syzkaller.appspot.com/bug?id=f012bdf297a7a4c860c38a88b44fbee43fd9bbf3
Link: http://lkml.kernel.org/r/20190522194519.GA5313@bharath12345-Inspiron-5559
Reported-by: syzbot+3a030a73b6c1e9833815@syzkaller.appspotmail.com
Signed-off-by: Bharath Vedartham <linux.bhar@gmail.com>
Signed-off-by: Dominique Martinet <dominique.martinet@cea.fr>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
fs/9p/cache.c | 2 ++
1 file changed, 2 insertions(+)
diff --git a/fs/9p/cache.c b/fs/9p/cache.c
index 9eb34701a566c..a43a8d2436db5 100644
--- a/fs/9p/cache.c
+++ b/fs/9p/cache.c
@@ -66,6 +66,8 @@ void v9fs_cache_session_get_cookie(struct v9fs_session_info *v9ses)
if (!v9ses->cachetag) {
if (v9fs_random_cachetag(v9ses) < 0) {
v9ses->fscache = NULL;
+ kfree(v9ses->cachetag);
+ v9ses->cachetag = NULL;
return;
}
}
--
2.20.1
next prev parent reply other threads:[~2019-10-01 16:53 UTC|newest]
Thread overview: 43+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-10-01 16:42 [PATCH AUTOSEL 4.19 01/43] ima: always return negative code for error Sasha Levin
2019-10-01 16:42 ` [PATCH AUTOSEL 4.19 02/43] ima: fix freeing ongoing ahash_request Sasha Levin
2019-10-01 16:42 ` [PATCH AUTOSEL 4.19 03/43] fs: nfs: Fix possible null-pointer dereferences in encode_attrs() Sasha Levin
2019-10-01 16:42 ` [PATCH AUTOSEL 4.19 04/43] 9p: Transport error uninitialized Sasha Levin
2019-10-01 16:42 ` [PATCH AUTOSEL 4.19 05/43] 9p: avoid attaching writeback_fid on mmap with type PRIVATE Sasha Levin
2019-10-01 16:42 ` Sasha Levin [this message]
2019-10-01 16:42 ` [PATCH AUTOSEL 4.19 07/43] xen/pci: reserve MCFG areas earlier Sasha Levin
2019-10-01 16:42 ` [PATCH AUTOSEL 4.19 08/43] ceph: fix directories inode i_blkbits initialization Sasha Levin
2019-10-01 16:42 ` [PATCH AUTOSEL 4.19 09/43] ceph: reconnect connection if session hang in opening state Sasha Levin
2019-10-01 16:42 ` [PATCH AUTOSEL 4.19 10/43] rbd: fix response length parameter for encoded strings Sasha Levin
2019-10-01 16:42 ` [PATCH AUTOSEL 4.19 11/43] watchdog: aspeed: Add support for AST2600 Sasha Levin
2019-10-01 16:42 ` [PATCH AUTOSEL 4.19 12/43] netfilter: nf_tables: allow lookups in dynamic sets Sasha Levin
2019-10-01 16:42 ` [PATCH AUTOSEL 4.19 13/43] drm/amdgpu: Fix KFD-related kernel oops on Hawaii Sasha Levin
2019-10-01 16:42 ` [PATCH AUTOSEL 4.19 14/43] drm/amdgpu: Check for valid number of registers to read Sasha Levin
2019-10-01 16:42 ` [PATCH AUTOSEL 4.19 15/43] pNFS: Ensure we do clear the return-on-close layout stateid on fatal errors Sasha Levin
2019-10-01 16:42 ` [PATCH AUTOSEL 4.19 16/43] net/sched: act_sample: don't push mac header on ip6gre ingress Sasha Levin
2019-10-01 16:42 ` [PATCH AUTOSEL 4.19 17/43] pwm: stm32-lp: Add check in case requested period cannot be achieved Sasha Levin
2019-10-01 16:42 ` [PATCH AUTOSEL 4.19 18/43] cdc_ncm: fix divide-by-zero caused by invalid wMaxPacketSize Sasha Levin
2019-10-01 16:42 ` [PATCH AUTOSEL 4.19 19/43] usbnet: ignore endpoints with " Sasha Levin
2019-10-01 16:42 ` [PATCH AUTOSEL 4.19 20/43] net/phy: fix DP83865 10 Mbps HDX loopback disable function Sasha Levin
2019-10-01 16:42 ` [PATCH AUTOSEL 4.19 21/43] net_sched: add max len check for TCA_KIND Sasha Levin
2019-10-01 16:42 ` [PATCH AUTOSEL 4.19 22/43] x86/purgatory: Disable the stackleak GCC plugin for the purgatory Sasha Levin
2019-10-01 16:42 ` [PATCH AUTOSEL 4.19 23/43] ntb: point to right memory window index Sasha Levin
2019-10-01 16:42 ` [PATCH AUTOSEL 4.19 24/43] thermal: Fix use-after-free when unregistering thermal zone device Sasha Levin
2019-10-01 16:42 ` [PATCH AUTOSEL 4.19 25/43] thermal_hwmon: Sanitize thermal_zone type Sasha Levin
2019-10-01 16:42 ` [PATCH AUTOSEL 4.19 26/43] libnvdimm/region: Initialize bad block for volatile namespaces Sasha Levin
2019-10-01 16:42 ` [PATCH AUTOSEL 4.19 27/43] fuse: fix memleak in cuse_channel_open Sasha Levin
2019-10-01 16:42 ` [PATCH AUTOSEL 4.19 28/43] arcnet: provide a buffer big enough to actually receive packets Sasha Levin
2019-10-01 16:42 ` [PATCH AUTOSEL 4.19 29/43] libnvdimm/nfit_test: Fix acpi_handle redefinition Sasha Levin
2019-10-01 16:42 ` [PATCH AUTOSEL 4.19 30/43] ppp: Fix memory leak in ppp_write Sasha Levin
2019-10-01 16:42 ` [PATCH AUTOSEL 4.19 31/43] sched/membarrier: Call sync_core only before usermode for same mm Sasha Levin
2019-10-01 16:43 ` [PATCH AUTOSEL 4.19 32/43] sched/membarrier: Fix private expedited registration check Sasha Levin
2019-10-01 16:43 ` [PATCH AUTOSEL 4.19 33/43] sched/core: Fix migration to invalid CPU in __set_cpus_allowed_ptr() Sasha Levin
2019-10-01 16:43 ` [PATCH AUTOSEL 4.19 34/43] perf build: Add detection of java-11-openjdk-devel package Sasha Levin
2019-10-01 16:43 ` [PATCH AUTOSEL 4.19 35/43] kernel/elfcore.c: include proper prototypes Sasha Levin
2019-10-01 16:43 ` [PATCH AUTOSEL 4.19 36/43] kexec: bail out upon SIGKILL when allocating memory Sasha Levin
2019-10-01 16:43 ` [PATCH AUTOSEL 4.19 37/43] macsec: drop skb sk before calling gro_cells_receive Sasha Levin
2019-10-01 16:43 ` [PATCH AUTOSEL 4.19 38/43] perf unwind: Fix libunwind build failure on i386 systems Sasha Levin
2019-10-01 16:43 ` [PATCH AUTOSEL 4.19 39/43] nfp: flower: fix memory leak in nfp_flower_spawn_vnic_reprs Sasha Levin
2019-10-01 16:43 ` [PATCH AUTOSEL 4.19 40/43] nfp: flower: prevent memory leak in nfp_flower_spawn_phy_reprs Sasha Levin
2019-10-01 16:43 ` [PATCH AUTOSEL 4.19 41/43] drm/radeon: Bail earlier when radeon.cik_/si_support=0 is passed Sasha Levin
2019-10-01 16:43 ` [PATCH AUTOSEL 4.19 42/43] usbnet: sanity checking of packet sizes and device mtu Sasha Levin
2019-10-01 16:43 ` [PATCH AUTOSEL 4.19 43/43] sch_netem: fix a divide by zero in tabledist() Sasha Levin
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