ghsa-76m2-73wx-8hj7
Vulnerability from github
In the Linux kernel, the following vulnerability has been resolved:
regmap: Fix possible double-free in regcache_rbtree_exit()
In regcache_rbtree_insert_to_block(), when 'present' realloc failed, the 'blk' which is supposed to assign to 'rbnode->block' will be freed, so 'rbnode->block' points a freed memory, in the error handling path of regcache_rbtree_init(), 'rbnode->block' will be freed again in regcache_rbtree_exit(), KASAN will report double-free as follows:
BUG: KASAN: double-free or invalid-free in kfree+0xce/0x390 Call Trace: slab_free_freelist_hook+0x10d/0x240 kfree+0xce/0x390 regcache_rbtree_exit+0x15d/0x1a0 regcache_rbtree_init+0x224/0x2c0 regcache_init+0x88d/0x1310 __regmap_init+0x3151/0x4a80 __devm_regmap_init+0x7d/0x100 madera_spi_probe+0x10f/0x333 [madera_spi] spi_probe+0x183/0x210 really_probe+0x285/0xc30
To fix this, moving up the assignment of rbnode->block to immediately after the reallocation has succeeded so that the data structure stays valid even if the second reallocation fails.
{
"affected": [],
"aliases": [
"CVE-2021-47483"
],
"database_specific": {
"cwe_ids": [],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2024-05-22T09:15:10Z",
"severity": null
},
"details": "In the Linux kernel, the following vulnerability has been resolved:\n\nregmap: Fix possible double-free in regcache_rbtree_exit()\n\nIn regcache_rbtree_insert_to_block(), when \u0027present\u0027 realloc failed,\nthe \u0027blk\u0027 which is supposed to assign to \u0027rbnode-\u003eblock\u0027 will be freed,\nso \u0027rbnode-\u003eblock\u0027 points a freed memory, in the error handling path of\nregcache_rbtree_init(), \u0027rbnode-\u003eblock\u0027 will be freed again in\nregcache_rbtree_exit(), KASAN will report double-free as follows:\n\nBUG: KASAN: double-free or invalid-free in kfree+0xce/0x390\nCall Trace:\n slab_free_freelist_hook+0x10d/0x240\n kfree+0xce/0x390\n regcache_rbtree_exit+0x15d/0x1a0\n regcache_rbtree_init+0x224/0x2c0\n regcache_init+0x88d/0x1310\n __regmap_init+0x3151/0x4a80\n __devm_regmap_init+0x7d/0x100\n madera_spi_probe+0x10f/0x333 [madera_spi]\n spi_probe+0x183/0x210\n really_probe+0x285/0xc30\n\nTo fix this, moving up the assignment of rbnode-\u003eblock to immediately after\nthe reallocation has succeeded so that the data structure stays valid even\nif the second reallocation fails.",
"id": "GHSA-76m2-73wx-8hj7",
"modified": "2024-05-22T09:31:46Z",
"published": "2024-05-22T09:31:46Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2021-47483"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/1cead23c1c0bc766dacb900a3b0269f651ad596f"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/36e911a16b377bde0ad91a8c679069d0d310b1a6"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/3dae1a4eced3ee733d7222e69b8a55caf2d61091"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/50cc1462a668dc62949a1127388bc3af785ce047"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/55e6d8037805b3400096d621091dfbf713f97e83"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/758ced2c3878ff789801e6fee808e185c5cf08d6"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/e72dce9afbdbfa70d9b44f5908a50ff6c4858999"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/fc081477b47dfc3a6cb50a96087fc29674013fc2"
}
],
"schema_version": "1.4.0",
"severity": []
}