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CVE-2024-56534

Description

In the Linux kernel, the following vulnerability has been resolved:isofs: avoid memory leak in iocharsetA 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): [] kmemleak_alloc+0xb8/0xc8 [] __kmalloc_node_track_caller_noprof+0x380/0x474 [] kstrdup+0x70/0xfc [] isofs_parse_param+0x228/0x2c0 [isofs] [] vfs_parse_fs_param+0xf4/0x164 [] vfs_parse_fs_string+0x8c/0xd4 [] vfs_parse_monolithic_sep+0xb0/0xfc [] generic_parse_monolithic+0x30/0x3c [] parse_monolithic_mount_data+0x40/0x4c [] path_mount+0x6c4/0x9ec [] do_mount+0xac/0xc4 [] __arm64_sys_mount+0x16c/0x2b0 [] invoke_syscall+0x7c/0x104 [] el0_svc_common.constprop.1+0xe0/0x104 [] do_el0_svc+0x2c/0x38 [] el0_svc+0x3c/0x1b8The opt->iocharset is freed inside the isofs_fill_super function,But there may be situations where it's not possible toenter this function.For example, in the get_tree_bdev_flags function,whenencountering the situation where "Can't mount, would change RO state,"In such a case, isofs_fill_super will not have the opportunityto be called,which means that opt->iocharset will not have the chanceto be freed,ultimately leading to a memory leak.Let's move the memory freeing of opt->iocharset intoisofs_free_fc function.

CVE-2024-56534

Description

POC

Reference

Github