UBUNTU-CVE-2024-49941
In the Linux kernel, the following vulnerability has been resolved: gpiolib: Fix potential NULL pointer dereference in gpiod_get_label() In `gpiod_get_label()`, it is possible that `srcu_dereference_check()` may return a NULL pointer, leading to a scenario where `label->str` is accessed without verifying if `label` itself is NULL. This patch adds a proper NULL check for `label` before accessing `label->str`. The check for `label->str != NULL` is removed because `label->str` can never be NULL if `label` is not NULL. This fixes the issue where the label name was being printed as `(efault)` when dumping the sysfs GPIO file when `label == NULL`.
02 / AFFECTED SOFTWARE
Affected packages
29 explicit affected versions
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37 explicit affected versions
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37 explicit affected versions
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38 explicit affected versions
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13 explicit affected versions
1 explicit affected versions
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1 explicit affected versions
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12 explicit affected versions
26 explicit affected versions
7 explicit affected versions
23 explicit affected versions
7 explicit affected versions
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3 explicit affected versions
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44 explicit affected versions
4 explicit affected versions
4 explicit affected versions
13 explicit affected versions
16 explicit affected versions
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12 explicit affected versions
13 explicit affected versions
7 explicit affected versions
14 explicit affected versions
18 explicit affected versions
3 explicit affected versions
16 explicit affected versions
43 explicit affected versions
11 explicit affected versions
35 explicit affected versions
12 explicit affected versions
13 explicit affected versions
6 explicit affected versions
12 explicit affected versions
50 explicit affected versions
11 explicit affected versions
12 explicit affected versions
27 explicit affected versions
12 explicit affected versions
7 explicit affected versions
03 / CONNECTIONS
Connected vulnerabilities
04 / EVIDENCE
Source records
In the Linux kernel, the following vulnerability has been resolved: gpiolib: Fix potential NULL pointer dereference in gpiod_get_label() In `gpiod_get_label()`, it is possible that `srcu_dereference_check()` may return a NULL pointer, leading to a scenario where `label->str` is accessed without verifying if `label` itself is NULL. This patch adds a proper NULL check for `label` before accessing `label->str`. The check for `label->str != NULL` is removed because `label->str` can never be NULL if `label` is not NULL. This fixes the issue where the label name was being printed as `(efault)` when dumping the sysfs GPIO file when `label == NULL`.
05 / REFERENCES
Further evidence
- https://git.kernel.org/linus/7b99b5ab885993bff010ebcd93be5e511c56e28a
- https://git.kernel.org/stable/c/7b99b5ab885993bff010ebcd93be5e511c56e28a
- https://git.kernel.org/stable/c/9ee4b907d7a5d7a53b4ff7727c371ff3d44ccbbb
- https://ubuntu.com/security/CVE-2024-49941
- https://ubuntu.com/security/notices/USN-7276-1
- https://ubuntu.com/security/notices/USN-7277-1
- https://ubuntu.com/security/notices/USN-7310-1
- https://www.cve.org/CVERecord?id=CVE-2024-49941