UBUNTU-CVE-2021-46924

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UBUNTU-CVE-2021-46924

Summary:

Details: In the Linux kernel, the following vulnerability has been resolved: NFC: st21nfca: Fix memory leak in device probe and remove 'phy->pending_skb' is alloced when device probe, but forgot to free in the error handling path and remove path, this cause memory leak as follows: unreferenced object 0xffff88800bc06800 (size 512): comm "8", pid 11775, jiffies 4295159829 (age 9.032s) hex dump (first 32 bytes): 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ backtrace: [<00000000d66c09ce>] __kmalloc_node_track_caller+0x1ed/0x450 [<00000000c93382b3>] kmalloc_reserve+0x37/0xd0 [<000000005fea522c>] __alloc_skb+0x124/0x380 [<0000000019f29f9a>] st21nfca_hci_i2c_probe+0x170/0x8f2 Fix it by freeing 'pending_skb' in error and remove.

References: https://ubuntu.com/security/CVE-2021-46924, https://git.kernel.org/linus/1b9dadba502234eea7244879b8d5d126bfaf9f0c, https://git.kernel.org/stable/c/38c3e320e7ff46f2dc67bc5045333e63d9f8918d, https://git.kernel.org/stable/c/a1e0080a35a16ce3808f7040fe0c3a8fdb052349, https://git.kernel.org/stable/c/1cd4063dbc91cf7965d73a6a3855e2028cd4613b, https://git.kernel.org/stable/c/e553265ea56482da5700f56319fda9ff53e7dcb4, https://git.kernel.org/stable/c/238920381b8925d070d32d73cd9ce52ab29896fe, https://git.kernel.org/stable/c/1b9dadba502234eea7244879b8d5d126bfaf9f0c, https://www.cve.org/CVERecord?id=CVE-2021-46924, https://ubuntu.com/security/notices/USN-6976-1