This is a note to let you know that I've just added the patch titled
isofs: avoid memory leak in iocharset
to the 6.11-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:
isofs-avoid-memory-leak-in-iocharset.patch
and it can be found in the queue-6.11 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit 297eba75d0c9aaa61b4d976c1485a2af2bbe13c6
Author: Hao Ge <gehao@xxxxxxxxxx>
Date: Wed Nov 6 16:28:41 2024 +0800
isofs: avoid memory leak in iocharset
[ Upstream commit 0b5bbeee4de616a268db77e2f40f19ab010a367b ]
A memleak was found as below:
unreferenced object 0xffff0000d10164d8 (size 8):
comm "pool-udisksd", pid 108217, jiffies 4295408555
hex dump (first 8 bytes):
75 74 66 38 00 cc cc cc utf8....
backtrace (crc de430d31):
[<ffff800081046e6c>] kmemleak_alloc+0xb8/0xc8
[<ffff8000803e6c3c>] __kmalloc_node_track_caller_noprof+0x380/0x474
[<ffff800080363b74>] kstrdup+0x70/0xfc
[<ffff80007bb3c6a4>] isofs_parse_param+0x228/0x2c0 [isofs]
[<ffff8000804d7f68>] vfs_parse_fs_param+0xf4/0x164
[<ffff8000804d8064>] vfs_parse_fs_string+0x8c/0xd4
[<ffff8000804d815c>] vfs_parse_monolithic_sep+0xb0/0xfc
[<ffff8000804d81d8>] generic_parse_monolithic+0x30/0x3c
[<ffff8000804d8bfc>] parse_monolithic_mount_data+0x40/0x4c
[<ffff8000804b6a64>] path_mount+0x6c4/0x9ec
[<ffff8000804b6e38>] do_mount+0xac/0xc4
[<ffff8000804b7494>] __arm64_sys_mount+0x16c/0x2b0
[<ffff80008002b8dc>] invoke_syscall+0x7c/0x104
[<ffff80008002ba44>] el0_svc_common.constprop.1+0xe0/0x104
[<ffff80008002ba94>] do_el0_svc+0x2c/0x38
[<ffff800081041108>] el0_svc+0x3c/0x1b8
The opt->iocharset is freed inside the isofs_fill_super function,
But there may be situations where it's not possible to
enter this function.
For example, in the get_tree_bdev_flags function,when
encountering the situation where "Can't mount, would change RO state,"
In such a case, isofs_fill_super will not have the opportunity
to be called,which means that opt->iocharset will not have the chance
to be freed,ultimately leading to a memory leak.
Let's move the memory freeing of opt->iocharset into
isofs_free_fc function.
Fixes: 1b17a46c9243 ("isofs: convert isofs to use the new mount API")
Signed-off-by: Hao Ge <gehao@xxxxxxxxxx>
Reviewed-by: Eric Sandeen <sandeen@xxxxxxxxxx>
Signed-off-by: Jan Kara <jack@xxxxxxx>
Link: https://patch.msgid.link/20241106082841.51773-1-hao.ge@xxxxxxxxx
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/fs/isofs/inode.c b/fs/isofs/inode.c
index f50311a6b4299..47038e6608123 100644
--- a/fs/isofs/inode.c
+++ b/fs/isofs/inode.c
@@ -948,8 +948,6 @@ static int isofs_fill_super(struct super_block *s, struct fs_context *fc)
goto out_no_inode;
}
- kfree(opt->iocharset);
-
return 0;
/*
@@ -987,7 +985,6 @@ static int isofs_fill_super(struct super_block *s, struct fs_context *fc)
brelse(bh);
brelse(pri_bh);
out_freesbi:
- kfree(opt->iocharset);
kfree(sbi);
s->s_fs_info = NULL;
return error;
@@ -1528,7 +1525,10 @@ static int isofs_get_tree(struct fs_context *fc)
static void isofs_free_fc(struct fs_context *fc)
{
- kfree(fc->fs_private);
+ struct isofs_options *opt = fc->fs_private;
+
+ kfree(opt->iocharset);
+ kfree(opt);
}
static const struct fs_context_operations isofs_context_ops = {
