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linux-stable/fs/isofs
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Hao Ge 0b5bbeee4d isofs: avoid memory leak in iocharset 
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: 1b17a46c92 ("isofs: convert isofs to use the new mount API")
Signed-off-by: Hao Ge <gehao@kylinos.cn>
Reviewed-by: Eric Sandeen <sandeen@redhat.com>
Signed-off-by: Jan Kara <jack@suse.cz>
Link: https://patch.msgid.link/20241106082841.51773-1-hao.ge@linux.dev
2024-11-06 20:24:41 +01:00
..
compress.c isofs: Remove calls to set/clear the error flag 2024-04-23 23:22:11 +02:00
dir.c isofs: remove redundant continue statement 2021-06-17 17:11:42 +02:00
export.c docs: fs: convert docs without extension to ReST 2019-07-31 13:31:05 -06:00
inode.c isofs: avoid memory leak in iocharset 2024-11-06 20:24:41 +01:00
isofs.h move asm/unaligned.h to linux/unaligned.h 2024-10-02 17:23:23 -04:00
joliet.c isofs: joliet: Fix iocharset=utf8 mount option 2021-08-12 16:07:14 +02:00
Kconfig fs: add CONFIG_BUFFER_HEAD 2023-08-02 09:13:09 -06:00
Makefile isofs: Use *-y instead of *-objs in Makefile 2024-05-09 18:09:57 +02:00
namei.c isofs: release buffer head before return 2021-01-25 17:57:38 +01:00
rock.c isofs: Convert rock_ridge_symlink_read_folio to use a folio 2024-05-31 12:31:40 +02:00
rock.h isofs: Annotate struct SL_component with __counted_by() 2024-09-02 15:52:56 +02:00
util.c Merge branch 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jack/linux-fs 2017-11-14 14:13:11 -08:00
zisofs.h treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 142 2019-05-30 11:25:17 -07:00