CVE-2023-53468

In the Linux kernel, the following vulnerability has been resolved:<br /> <br /> ubifs: Fix memory leak in alloc_wbufs()<br /> <br /> kmemleak reported a sequence of memory leaks, and show them as following:<br /> <br /> unreferenced object 0xffff8881575f8400 (size 1024):<br /> comm "mount", pid 19625, jiffies 4297119604 (age 20.383s)<br /> hex dump (first 32 bytes):<br /> 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................<br /> 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................<br /> backtrace:<br /> [] __kmalloc+0x4d/0x150<br /> [] ubifs_mount+0x307b/0x7170 [ubifs]<br /> [] legacy_get_tree+0xed/0x1d0<br /> [] vfs_get_tree+0x7d/0x230<br /> [] path_mount+0xdd4/0x17b0<br /> [] __x64_sys_mount+0x1fa/0x270<br /> [] do_syscall_64+0x35/0x80<br /> [] entry_SYSCALL_64_after_hwframe+0x46/0xb0<br /> <br /> unreferenced object 0xffff8881798a6e00 (size 512):<br /> comm "mount", pid 19677, jiffies 4297121912 (age 37.816s)<br /> hex dump (first 32 bytes):<br /> 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk<br /> 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk<br /> backtrace:<br /> [] __kmalloc+0x4d/0x150<br /> [] ubifs_wbuf_init+0x52/0x480 [ubifs]<br /> [] ubifs_mount+0x31f5/0x7170 [ubifs]<br /> [] legacy_get_tree+0xed/0x1d0<br /> [] vfs_get_tree+0x7d/0x230<br /> [] path_mount+0xdd4/0x17b0<br /> [] __x64_sys_mount+0x1fa/0x270<br /> [] do_syscall_64+0x35/0x80<br /> [] entry_SYSCALL_64_after_hwframe+0x46/0xb0<br /> <br /> The problem is that the ubifs_wbuf_init() returns an error in the<br /> loop which in the alloc_wbufs(), then the wbuf-&gt;buf and wbuf-&gt;inodes<br /> that were successfully alloced before are not freed.<br /> <br /> Fix it by adding error hanging path in alloc_wbufs() which frees<br /> the memory alloced before when ubifs_wbuf_init() returns an error.