Description
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 products
Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.
Linux Linux
Default version status: unaffected
3f4ff561bc88b074d5e868dde4012d89cbb06c87 to < e72dce9afbdbfa70d9b44f5908a50ff6c4858999affected3f4ff561bc88b074d5e868dde4012d89cbb06c87 to < fc081477b47dfc3a6cb50a96087fc29674013fc2affected3f4ff561bc88b074d5e868dde4012d89cbb06c87 to < 758ced2c3878ff789801e6fee808e185c5cf08d6affected3f4ff561bc88b074d5e868dde4012d89cbb06c87 to < 3dae1a4eced3ee733d7222e69b8a55caf2d61091affected3f4ff561bc88b074d5e868dde4012d89cbb06c87 to < 1cead23c1c0bc766dacb900a3b0269f651ad596faffected3f4ff561bc88b074d5e868dde4012d89cbb06c87 to < 36e911a16b377bde0ad91a8c679069d0d310b1a6affected3f4ff561bc88b074d5e868dde4012d89cbb06c87 to < 50cc1462a668dc62949a1127388bc3af785ce047affected3f4ff561bc88b074d5e868dde4012d89cbb06c87 to < 55e6d8037805b3400096d621091dfbf713f97e83affected
Linux Linux
Default version status: affected
3.12affected0 to < 3.12unaffected4.4.291 to ≤ 4.4.*unaffected4.9.289 to ≤ 4.9.*unaffected4.14.254 to ≤ 4.14.*unaffected4.19.215 to ≤ 4.19.*unaffected5.4.157 to ≤ 5.4.*unaffected5.10.77 to ≤ 5.10.*unaffected5.14.16 to ≤ 5.14.*unaffected5.15 to ≤ *unaffected
References
- https://git.kernel.org/stable/c/e72dce9afbdbfa70d9b44f5908a50ff6c4858999 ↗
- https://git.kernel.org/stable/c/fc081477b47dfc3a6cb50a96087fc29674013fc2 ↗
- https://git.kernel.org/stable/c/758ced2c3878ff789801e6fee808e185c5cf08d6 ↗
- https://git.kernel.org/stable/c/3dae1a4eced3ee733d7222e69b8a55caf2d61091 ↗
- https://git.kernel.org/stable/c/1cead23c1c0bc766dacb900a3b0269f651ad596f ↗
- https://git.kernel.org/stable/c/36e911a16b377bde0ad91a8c679069d0d310b1a6 ↗
- https://git.kernel.org/stable/c/50cc1462a668dc62949a1127388bc3af785ce047 ↗
- https://git.kernel.org/stable/c/55e6d8037805b3400096d621091dfbf713f97e83 ↗