cve-2021-47483
Vulnerability from cvelistv5
Published
2024-05-22 08:19
Modified
2024-11-04 12:06
Severity ?
Summary
regmap: Fix possible double-free in regcache_rbtree_exit()
Impacted products
LinuxLinux
LinuxLinux
Show details on NVD website


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          "value": "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."
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    "datePublished": "2024-05-22T08:19:34.852Z",
    "dateReserved": "2024-05-22T06:20:56.200Z",
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}


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