On Wed 06-11-24 16:28:41, Hao Ge wrote:
> From: Hao Ge <gehao@xxxxxxxxxx>
>
> 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>
Thanks. I've added the patch to my tree.
Honza
--
Jan Kara <jack@xxxxxxxx>
SUSE Labs, CR
