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.
Vendor | Product | Version | CPE |
---|---|---|---|
linux | linux_kernel | * | cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* |
[
{
"product": "Linux",
"vendor": "Linux",
"defaultStatus": "unaffected",
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"programFiles": [
"drivers/base/regmap/regcache-rbtree.c"
],
"versions": [
{
"version": "3f4ff561bc88",
"lessThan": "e72dce9afbdb",
"status": "affected",
"versionType": "git"
},
{
"version": "3f4ff561bc88",
"lessThan": "fc081477b47d",
"status": "affected",
"versionType": "git"
},
{
"version": "3f4ff561bc88",
"lessThan": "758ced2c3878",
"status": "affected",
"versionType": "git"
},
{
"version": "3f4ff561bc88",
"lessThan": "3dae1a4eced3",
"status": "affected",
"versionType": "git"
},
{
"version": "3f4ff561bc88",
"lessThan": "1cead23c1c0b",
"status": "affected",
"versionType": "git"
},
{
"version": "3f4ff561bc88",
"lessThan": "36e911a16b37",
"status": "affected",
"versionType": "git"
},
{
"version": "3f4ff561bc88",
"lessThan": "50cc1462a668",
"status": "affected",
"versionType": "git"
},
{
"version": "3f4ff561bc88",
"lessThan": "55e6d8037805",
"status": "affected",
"versionType": "git"
}
]
},
{
"product": "Linux",
"vendor": "Linux",
"defaultStatus": "affected",
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"programFiles": [
"drivers/base/regmap/regcache-rbtree.c"
],
"versions": [
{
"version": "3.12",
"status": "affected"
},
{
"version": "0",
"lessThan": "3.12",
"status": "unaffected",
"versionType": "custom"
},
{
"version": "4.4.291",
"lessThanOrEqual": "4.4.*",
"status": "unaffected",
"versionType": "custom"
},
{
"version": "4.9.289",
"lessThanOrEqual": "4.9.*",
"status": "unaffected",
"versionType": "custom"
},
{
"version": "4.14.254",
"lessThanOrEqual": "4.14.*",
"status": "unaffected",
"versionType": "custom"
},
{
"version": "4.19.215",
"lessThanOrEqual": "4.19.*",
"status": "unaffected",
"versionType": "custom"
},
{
"version": "5.4.157",
"lessThanOrEqual": "5.4.*",
"status": "unaffected",
"versionType": "custom"
},
{
"version": "5.10.77",
"lessThanOrEqual": "5.10.*",
"status": "unaffected",
"versionType": "custom"
},
{
"version": "5.14.16",
"lessThanOrEqual": "5.14.*",
"status": "unaffected",
"versionType": "custom"
},
{
"version": "5.15",
"lessThanOrEqual": "*",
"status": "unaffected",
"versionType": "original_commit_for_fix"
}
]
}
]
git.kernel.org/stable/c/1cead23c1c0bc766dacb900a3b0269f651ad596f
git.kernel.org/stable/c/36e911a16b377bde0ad91a8c679069d0d310b1a6
git.kernel.org/stable/c/3dae1a4eced3ee733d7222e69b8a55caf2d61091
git.kernel.org/stable/c/50cc1462a668dc62949a1127388bc3af785ce047
git.kernel.org/stable/c/55e6d8037805b3400096d621091dfbf713f97e83
git.kernel.org/stable/c/758ced2c3878ff789801e6fee808e185c5cf08d6
git.kernel.org/stable/c/e72dce9afbdbfa70d9b44f5908a50ff6c4858999
git.kernel.org/stable/c/fc081477b47dfc3a6cb50a96087fc29674013fc2