cve/2024/CVE-2024-42315.md

### [CVE-2024-42315](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2024-42315)
![](https://img.shields.io/static/v1?label=Product&message=Linux&color=blue)
![](https://img.shields.io/static/v1?label=Version&message=a3ff29a95fde%3C%20a7ac198f8dba%20&color=brighgreen)
![](https://img.shields.io/static/v1?label=Vulnerability&message=n%2Fa&color=brighgreen)

### Description

In the Linux kernel, the following vulnerability has been resolved:exfat: fix potential deadlock on __exfat_get_dentry_setWhen accessing a file with more entries than ES_MAX_ENTRY_NUM, the bh-arrayis allocated in __exfat_get_entry_set. The problem is that the bh-array isallocated with GFP_KERNEL. It does not make sense. In the following cases,a deadlock for sbi->s_lock between the two processes may occur.       CPU0                CPU1       ----                ----  kswapd   balance_pgdat    lock(fs_reclaim)                      exfat_iterate                       lock(&sbi->s_lock)                       exfat_readdir                        exfat_get_uniname_from_ext_entry                         exfat_get_dentry_set                          __exfat_get_dentry_set                           kmalloc_array                            ...                            lock(fs_reclaim)    ...    evict     exfat_evict_inode      lock(&sbi->s_lock)To fix this, let's allocate bh-array with GFP_NOFS.

### POC

#### Reference
No PoCs from references.

#### Github
- https://github.com/fkie-cad/nvd-json-data-feeds