Bug 2309802 (CVE-2024-44971)

Summary: CVE-2024-44971 kernel: net: dsa: bcm_sf2: Fix a possible memory leak in bcm_sf2_mdio_register()
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
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Priority: medium    
Version: unspecifiedCC: dfreiber, drow, jburrell, vkumar
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Hardware: All   
OS: Linux   
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Bug Depends On: 2309814    
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Description OSIDB Bzimport 2024-09-04 19:21:28 UTC 
In the Linux kernel, the following vulnerability has been resolved:

net: dsa: bcm_sf2: Fix a possible memory leak in bcm_sf2_mdio_register()

bcm_sf2_mdio_register() calls of_phy_find_device() and then
phy_device_remove() in a loop to remove existing PHY devices.
of_phy_find_device() eventually calls bus_find_device(), which calls
get_device() on the returned struct device * to increment the refcount.
The current implementation does not decrement the refcount, which causes
memory leak.

This commit adds the missing phy_device_free() call to decrement the
refcount via put_device() to balance the refcount.
Comment 1 Robb Gatica 2024-09-04 20:05:12 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2024090457-CVE-2024-44971-eb75@gregkh/T