cve-2021-47483
Vulnerability from cvelistv5
Published
2024-05-22 08:19
Modified
2024-12-19 07:43
Severity ?
Summary
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.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/1cead23c1c0bc766dacb900a3b0269f651ad596f
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/36e911a16b377bde0ad91a8c679069d0d310b1a6
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/3dae1a4eced3ee733d7222e69b8a55caf2d61091
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/50cc1462a668dc62949a1127388bc3af785ce047
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/55e6d8037805b3400096d621091dfbf713f97e83
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/758ced2c3878ff789801e6fee808e185c5cf08d6
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/e72dce9afbdbfa70d9b44f5908a50ff6c4858999
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/fc081477b47dfc3a6cb50a96087fc29674013fc2
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/1cead23c1c0bc766dacb900a3b0269f651ad596f
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/36e911a16b377bde0ad91a8c679069d0d310b1a6
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/3dae1a4eced3ee733d7222e69b8a55caf2d61091
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/50cc1462a668dc62949a1127388bc3af785ce047
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/55e6d8037805b3400096d621091dfbf713f97e83
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/758ced2c3878ff789801e6fee808e185c5cf08d6
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/e72dce9afbdbfa70d9b44f5908a50ff6c4858999
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/fc081477b47dfc3a6cb50a96087fc29674013fc2
Impacted products
Vendor Product Version
Linux Linux Version: 3.12
Show details on NVD website

To clipboard 

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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.\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: regmap: corrige posible doble liberaci\u00f3n en regcache_rbtree_exit() En regcache_rbtree_insert_to_block(), cuando la realloc \u0027presente\u0027 fallaba, el \u0027blk\u0027 que se supone debe asignarse a \u0027rbnode-\u0026gt;block \u0027 se liberar\u00e1, por lo que \u0027rbnode-\u0026gt;block\u0027 apunta a una memoria liberada, en la ruta de manejo de errores de regcache_rbtree_init(), \u0027rbnode-\u0026gt;block\u0027 se liberar\u00e1 nuevamente en regcache_rbtree_exit(), KASAN informar\u00e1 la doble liberaci\u00f3n de la siguiente manera : ERROR: KASAN: doble libre o no v\u00e1lido en kfree+0xce/0x390 Rastreo de llamadas: 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 Actually_probe+0x285/0xc30 Para solucionar este problema, mueva hacia arriba la asignaci\u00f3n de rbnode-\u0026gt;block inmediatamente despu\u00e9s de que la reasignaci\u00f3n se haya realizado correctamente para que la estructura de datos permanezca v\u00e1lido incluso si la segunda reasignaci\u00f3n 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