In the Linux kernel, the following vulnerability has been resolved:
net: batman-adv: fix error handling
Syzbot reported ODEBUG warning in batadv_nc_mesh_free(). The problem was
in wrong error handling in batadv_mesh_init().
Before this patch batadv_mesh_init() was calling batadv_mesh_free() in case
of any batadv_*_init() calls failure. This approach may work well, when
there is some kind of indicator, which can tell which parts of batadv are
initialized; but there isn't any.
All written above lead to cleaning up uninitialized fields. Even if we hide
ODEBUG warning by initializing bat_priv->nc.work, syzbot was able to hit
GPF in batadv_nc_purge_paths(), because hash pointer in still NULL. [1]
To fix these bugs we can unwind batadv_*_init() calls one by one.
It is good approach for 2 reasons: 1) It fixes bugs on error handling
path 2) It improves the performance, since we won't call unneeded
batadv_*_free() functions.
So, this patch makes all batadv_*_init() clean up all allocated memory
before returning with an error to no call correspoing batadv_*_free()
and open-codes batadv_mesh_free() with proper order to avoid touching
uninitialized fields.
References
Configurations
Configuration 1 (hide)
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History
02 Apr 2025, 15:09
| Type | Values Removed | Values Added |
|---|---|---|
| CPE | cpe:2.3:o:linux:linux_kernel:5.15:rc7:*:*:*:*:*:* cpe:2.3:o:linux:linux_kernel:5.15:rc2:*:*:*:*:*:* cpe:2.3:o:linux:linux_kernel:5.15:rc3:*:*:*:*:*:* cpe:2.3:o:linux:linux_kernel:5.15:rc4:*:*:*:*:*:* cpe:2.3:o:linux:linux_kernel:5.15:rc5:*:*:*:*:*:* cpe:2.3:o:linux:linux_kernel:5.15:rc6:*:*:*:*:*:* cpe:2.3:o:linux:linux_kernel:5.15:rc1:*:*:*:*:*:* cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* |
|
| References | () https://git.kernel.org/stable/c/07533f1a673ce1126d0a72ef1e4b5eaaa3dd6d20 - Patch | |
| References | () https://git.kernel.org/stable/c/0c6b199f09be489c48622537a550787fc80aea73 - Patch | |
| References | () https://git.kernel.org/stable/c/6422e8471890273994fe8cc6d452b0dcd2c9483e - Patch | |
| References | () https://git.kernel.org/stable/c/6f68cd634856f8ca93bafd623ba5357e0f648c68 - Patch | |
| References | () https://git.kernel.org/stable/c/a8f7359259dd5923adc6129284fdad12fc5db347 - Patch | |
| References | () https://git.kernel.org/stable/c/b0a2cd38553c77928ef1646ed1518486b1e70ae8 - Patch | |
| References | () https://git.kernel.org/stable/c/e50f957652190b5a88a8ebce7e5ab14ebd0d3f00 - Patch | |
| References | () https://git.kernel.org/stable/c/fbf150b16a3635634b7dfb7f229d8fcd643c6c51 - Patch | |
| First Time |
Linux linux Kernel
Linux |
Information
Published : 2024-05-22 09:15
Updated : 2025-04-02 15:09
NVD link : CVE-2021-47482
Mitre link : CVE-2021-47482
CVE.ORG link : CVE-2021-47482
JSON object : View
Products Affected
linux
- linux_kernel
CWE
CWE-544
Missing Standardized Error Handling Mechanism