UBUNTU-CVE-2021-47483
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.
02 / AFFECTED SOFTWARE
Affected packages
50 explicit affected versions
6 explicit affected versions
12 explicit affected versions
6 explicit affected versions
9 explicit affected versions
180 explicit affected versions
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35 explicit affected versions
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28 explicit affected versions
35 explicit affected versions
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87 explicit affected versions
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106 explicit affected versions
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21 explicit affected versions
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1 explicit affected versions
7 explicit affected versions
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1 explicit affected versions
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38 explicit affected versions
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12 explicit affected versions
38 explicit affected versions
105 explicit affected versions
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173 explicit affected versions
37 explicit affected versions
10 explicit affected versions
1 explicit affected versions
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13 explicit affected versions
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69 explicit affected versions
1 explicit affected versions
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23 explicit affected versions
10 explicit affected versions
54 explicit affected versions
11 explicit affected versions
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77 explicit affected versions
7 explicit affected versions
12 explicit affected versions
38 explicit affected versions
2 explicit affected versions
150 explicit affected versions
34 explicit affected versions
10 explicit affected versions
26 explicit affected versions
13 explicit affected versions
16 explicit affected versions
3 explicit affected versions
1 explicit affected versions
6 explicit affected versions
51 explicit affected versions
32 explicit affected versions
12 explicit affected versions
27 explicit affected versions
1 explicit affected versions
1 explicit affected versions
35 explicit affected versions
8 explicit affected versions
5 explicit affected versions
28 explicit affected versions
8 explicit affected versions
1 explicit affected versions
28 explicit affected versions
10 explicit affected versions
13 explicit affected versions
1 explicit affected versions
7 explicit affected versions
31 explicit affected versions
10 explicit affected versions
12 explicit affected versions
26 explicit affected versions
44 explicit affected versions
16 explicit affected versions
3 explicit affected versions
13 explicit affected versions
26 explicit affected versions
37 explicit affected versions
38 explicit affected versions
9 explicit affected versions
11 explicit affected versions
28 explicit affected versions
7 explicit affected versions
83 explicit affected versions
9 explicit affected versions
85 explicit affected versions
62 explicit affected versions
4 explicit affected versions
53 explicit affected versions
28 explicit affected versions
43 explicit affected versions
1 explicit affected versions
129 explicit affected versions
102 explicit affected versions
10 explicit affected versions
8 explicit affected versions
14 explicit affected versions
30 explicit affected versions
4 explicit affected versions
17 explicit affected versions
1 explicit affected versions
9 explicit affected versions
03 / CONNECTIONS
Connected vulnerabilities
04 / EVIDENCE
Source records
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.
05 / REFERENCES
Further evidence
- https://git.kernel.org/linus/55e6d8037805b3400096d621091dfbf713f97e83
- https://git.kernel.org/stable/c/1cead23c1c0bc766dacb900a3b0269f651ad596f
- https://git.kernel.org/stable/c/36e911a16b377bde0ad91a8c679069d0d310b1a6
- https://git.kernel.org/stable/c/3dae1a4eced3ee733d7222e69b8a55caf2d61091
- https://git.kernel.org/stable/c/50cc1462a668dc62949a1127388bc3af785ce047
- https://git.kernel.org/stable/c/55e6d8037805b3400096d621091dfbf713f97e83
- https://git.kernel.org/stable/c/758ced2c3878ff789801e6fee808e185c5cf08d6
- https://git.kernel.org/stable/c/e72dce9afbdbfa70d9b44f5908a50ff6c4858999
- https://git.kernel.org/stable/c/fc081477b47dfc3a6cb50a96087fc29674013fc2
- https://ubuntu.com/security/CVE-2021-47483
- https://ubuntu.com/security/notices/USN-7415-1
- https://ubuntu.com/security/notices/USN-7429-1
- https://ubuntu.com/security/notices/USN-7429-2
- https://www.cve.org/CVERecord?id=CVE-2021-47483