CVE-2021-46937
Vulnerability from cvelistv5
Published
2024-02-27 09:44
Modified
2024-11-04 11:56
Severity ?
Summary
mm/damon/dbgfs: fix 'struct pid' leaks in 'dbgfs_target_ids_write()'
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/ebb3f994dd92f8fb4d70c7541091216c1e10cb71Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/ffe4a1ba1a82c416a6b3a09d46594f6a885ae141Patch
Impacted products
LinuxLinux
LinuxLinux
Show details on NVD website

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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmm/damon/dbgfs: fix \u0027struct pid\u0027 leaks in \u0027dbgfs_target_ids_write()\u0027\n\nDAMON debugfs interface increases the reference counts of \u0027struct pid\u0027s\nfor targets from the \u0027target_ids\u0027 file write callback\n(\u0027dbgfs_target_ids_write()\u0027), but decreases the counts only in DAMON\nmonitoring termination callback (\u0027dbgfs_before_terminate()\u0027).\n\nTherefore, when \u0027target_ids\u0027 file is repeatedly written without DAMON\nmonitoring start/termination, the reference count is not decreased and\ntherefore memory for the \u0027struct pid\u0027 cannot be freed.  This commit\nfixes this issue by decreasing the reference counts when \u0027target_ids\u0027 is\nwritten."
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