UBUNTU-CVE-2021-47385
In the Linux kernel, the following vulnerability has been resolved: hwmon: (w83792d) Fix NULL pointer dereference by removing unnecessary structure field If driver read val value sufficient for (val & 0x08) && (!(val & 0x80)) && ((val & 0x7) == ((val >> 4) & 0x7)) from device then Null pointer dereference occurs. (It is possible if tmp = 0b0xyz1xyz, where same literals mean same numbers) Also lm75[] does not serve a purpose anymore after switching to devm_i2c_new_dummy_device() in w83791d_detect_subclients(). The patch fixes possible NULL pointer dereference by removing lm75[]. Found by Linux Driver Verification project (linuxtesting.org). [groeck: Dropped unnecessary continuation lines, fixed multipline alignment]
02 / AFFECTED SOFTWARE
Affected packages
6 explicit affected versions
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191 explicit affected versions
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26 explicit affected versions
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27 explicit affected versions
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134 explicit affected versions
113 explicit affected versions
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27 explicit affected versions
43 explicit affected versions
1 explicit affected versions
137 explicit affected versions
158 explicit affected versions
10 explicit affected versions
8 explicit affected versions
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29 explicit affected versions
4 explicit affected versions
16 explicit affected versions
1 explicit affected versions
60 explicit affected versions
03 / CONNECTIONS
Connected vulnerabilities
04 / EVIDENCE
Source records
In the Linux kernel, the following vulnerability has been resolved: hwmon: (w83792d) Fix NULL pointer dereference by removing unnecessary structure field If driver read val value sufficient for (val & 0x08) && (!(val & 0x80)) && ((val & 0x7) == ((val >> 4) & 0x7)) from device then Null pointer dereference occurs. (It is possible if tmp = 0b0xyz1xyz, where same literals mean same numbers) Also lm75[] does not serve a purpose anymore after switching to devm_i2c_new_dummy_device() in w83791d_detect_subclients(). The patch fixes possible NULL pointer dereference by removing lm75[]. Found by Linux Driver Verification project (linuxtesting.org). [groeck: Dropped unnecessary continuation lines, fixed multipline alignment]
05 / REFERENCES
Further evidence
- https://git.kernel.org/linus/0f36b88173f028e372668ae040ab1a496834d278
- https://git.kernel.org/stable/c/0f36b88173f028e372668ae040ab1a496834d278
- https://git.kernel.org/stable/c/1499bb2c3a87a2efea0065adab2bd66badee61c3
- https://git.kernel.org/stable/c/200ced5ba724d8bbf29dfac4ed1e17a39ccaccd1
- https://git.kernel.org/stable/c/24af1fe376e22c42238a4a604d31e46c486876c3
- https://ubuntu.com/security/CVE-2021-47385
- https://ubuntu.com/security/notices/USN-7907-1
- https://ubuntu.com/security/notices/USN-7907-2
- https://ubuntu.com/security/notices/USN-7907-3
- https://ubuntu.com/security/notices/USN-7907-4
- https://ubuntu.com/security/notices/USN-7907-5
- https://ubuntu.com/security/notices/USN-7930-1
- https://ubuntu.com/security/notices/USN-7930-2
- https://ubuntu.com/security/notices/USN-7937-1
- https://www.cve.org/CVERecord?id=CVE-2021-47385