From cf4f4c12dea7a977a143c8fe5af1740b7f9876f8 Mon Sep 17 00:00:00 2001
From: Zeng Heng <zengheng4@huawei.com>
Date: Tue, 18 Oct 2022 14:38:14 -0700
Subject: [PATCH] xfs: fix memory leak in xfs_errortag_init
Git-commit: cf4f4c12dea7a977a143c8fe5af1740b7f9876f8
Patch-mainline: v6.1-rc4
References: git-fixes
When `xfs_sysfs_init` returns failed, `mp->m_errortag` needs to free.
Otherwise kmemleak would report memory leak after mounting xfs image:
unreferenced object 0xffff888101364900 (size 192):
comm "mount", pid 13099, jiffies 4294915218 (age 335.207s)
hex dump (first 32 bytes):
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
backtrace:
[<00000000f08ad25c>] __kmalloc+0x41/0x1b0
[<00000000dca9aeb6>] kmem_alloc+0xfd/0x430
[<0000000040361882>] xfs_errortag_init+0x20/0x110
[<00000000b384a0f6>] xfs_mountfs+0x6ea/0x1a30
[<000000003774395d>] xfs_fs_fill_super+0xe10/0x1a80
[<000000009cf07b6c>] get_tree_bdev+0x3e7/0x700
[<00000000046b5426>] vfs_get_tree+0x8e/0x2e0
[<00000000952ec082>] path_mount+0xf8c/0x1990
[<00000000beb1f838>] do_mount+0xee/0x110
[<000000000e9c41bb>] __x64_sys_mount+0x14b/0x1f0
[<00000000f7bb938e>] do_syscall_64+0x3b/0x90
[<000000003fcd67a9>] entry_SYSCALL_64_after_hwframe+0x63/0xcd
Fixes: c68401011522 ("xfs: expose errortag knobs via sysfs")
Signed-off-by: Zeng Heng <zengheng4@huawei.com>
Reviewed-by: Darrick J. Wong <djwong@kernel.org>
Signed-off-by: Darrick J. Wong <djwong@kernel.org>
Acked-by: Anthony Iliopoulos <ailiop@suse.com>
---
fs/xfs/xfs_error.c | 9 +++++++--
1 file changed, 7 insertions(+), 2 deletions(-)
diff --git a/fs/xfs/xfs_error.c b/fs/xfs/xfs_error.c
index 7db588ed0be5..c6b2aabd6f18 100644
--- a/fs/xfs/xfs_error.c
+++ b/fs/xfs/xfs_error.c
@@ -234,13 +234,18 @@ int
xfs_errortag_init(
struct xfs_mount *mp)
{
+ int ret;
+
mp->m_errortag = kmem_zalloc(sizeof(unsigned int) * XFS_ERRTAG_MAX,
KM_MAYFAIL);
if (!mp->m_errortag)
return -ENOMEM;
- return xfs_sysfs_init(&mp->m_errortag_kobj, &xfs_errortag_ktype,
- &mp->m_kobj, "errortag");
+ ret = xfs_sysfs_init(&mp->m_errortag_kobj, &xfs_errortag_ktype,
+ &mp->m_kobj, "errortag");
+ if (ret)
+ kmem_free(mp->m_errortag);
+ return ret;
}
void
--
2.35.3