CVE-2024-48881
Description
In the Linux kernel, the following vulnerability has been resolved: bcache: revert replacing IS_ERR_OR_NULL with IS_ERR again Commit 028ddcac477b ("bcache: Remove unnecessary NULL point check in node allocations") leads a NULL pointer deference in cache_set_flush(). 1721 if (!IS_ERR_OR_NULL(c->root)) 1722 list_add(&c->root->list, &c->btree_cache); >From the above code in cache_set_flush(), if previous registration code fails before allocating c->root, it is possible c->root is NULL as what it is initialized. __bch_btree_node_alloc() never returns NULL but c->root is possible to be NULL at above line 1721. This patch replaces IS_ERR() by IS_ERR_OR_NULL() to fix this.
How to fix
- linux linux_kernel4.20, 5.4.287, 5.10.231, 5.15.174, 6.1.120, 6.6.66, 6.12.5 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| linux linux_kernel | 4.19.291 ≤ v < 4.20, 5.4.251 ≤ v < 5.4.287, 5.10.188 ≤ v < 5.10.231, 5.15.121 ≤ v < 5.15.174, 6.1.39 ≤ v < 6.1.120, 6.4.4 ≤ v < 6.6.66, 6.7 ≤ v < 6.12.5, 6.13 | 4.20, 5.4.287, 5.10.231, 5.15.174, 6.1.120, 6.6.66, 6.12.5 |
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